FORESTRY AND THE FOREST
Whether the lumberman's judgment of economic influences leads him to
be optimistic or otherwise as to the profit of forestry in general,
he is most interested in the particular forest with which he has
to deal. He can neither accept nor dismiss the proposition
intelligently, much less put his ideas into actual practice, without
knowing something of the capability of his land to respond to his
effort. "What methods are best, what will they cost, and what will
be the result?" are questions which arise at the very outset. They
lead at once into the domain of technical forestry.
With us forestry has not been practiced long enough to furnish
demonstrated examples with which to answer such questions. We can,
however, profit by experience gained elsewhere, for the laws which
govern tree life are as universal as those which govern the life of
men and animals. In dealing with new species and new environments
we have no great difficulty in judging their future from their
past, which lies written plainly for those who care to study it.
While to some extent trees require elements obtainable only from
the soil, they are more independent in this respect than most other
forms of vegetation. Soil influences forest trees mainly by its
physical character, especially as this determines the moisture
contents. Very little nourishment is actually taken out of the
soil for, as someone has said, wood is nothing but air solidified
by sunshine. A tree's immense and complicated foliage system is
the laboratory with which it effects this transformation.
Since air exists everywhere and the chemical quality of the soil
is comparatively unimportant, the requirements of different species
for light, heat and moisture are what mainly determine their
distribution and habits of growth. And since heat and moisture are
largely climatic factors and fairly uniform in given localities,
it follows that the demand of a species upon light may practically
fix its habits and possibilities in those localities. The very great
variance of species in light requirement accounts to a large extent
for the composition of most primeval forests. It is of peculiar
importance in the management of forests by man because he cannot
control it as he may be able to control some of the other agencies
which affected the primeval forest, such as fire or seed supply.
It would be unprofitable to discuss here all the many methods of
forest management which have proved to be best, technically, for
given species and combinations of species. Where market and
transportation facilities are highly favorable, as in Europe, the
timber owner can adopt the method which will bring the best results,
but here he has no such choice. He can but bear in mind certain
fundamental principles, uniformly applicable to large areas for
considerable periods of time. Roughly, however, our Western forests
can be classified by their adaptability to the two directly opposite
systems, known as clean cutting and selection cutting, of which
almost all methods are modifications.
A selection forest is one in which all ages of trees exist, from
seedling to maturity. It is the natural growth of species which
are tolerant of shade. In a natural state, undisturbed by cutting,
it maintains much the same aspect continuously, for as the oldest
trees die, their place is taken by younger ones. Obviously such a
forest must be composed of species, whether one or several, which
can grow beneath its own shade. The understories of varying ages
are as dense as their light requirements and the density of the
overwood permit.
The common hardwood forests of the East illustrate one type of
the natural selection forest. On the Pacific slope an example is
afforded by hemlock, either practically pure or mixed with white
fir, but probably the most typical is the ordinary Western yellow
pine under certain conditions. At its best this tree composes a
forest so dense that all young growth is shaded out, but everyone
is familiar with the frequent opener stand containing all ages.
The younger trees are often called blackjack.
On the other hand, trees extremely intolerant of shade occur only
in what the forester calls even-aged forests. Being unable to start
in the darkness of an existing stand of any considerable density,
they must seize opportunities to recover openings. The Douglas
fir of the Northwest, more commonly called red or yellow fir, is
an excellent illustration. In the interior states this species
reproduces under cover to some extent, because there is a stronger
light average throughout the year and because the stand is not so
dense. In the typical Douglas fir forests of Oregon and Washington,
discussed in this booklet, it never does so. While hemlock, cedar
and white fir undergrowth may be abundant, Douglas fir seedlings
are seldom seen except in burns, slashings, roads, or open spots
in the woods. And the fir trees composing the dominant stand are
of nearly the same age.
How, then, did this even-aged fir forest begin? Close scrutiny
will practically always find the answer in fragments of charred
wood. Long ago another similar forest occupied the ground until
lightning or an Indian's fire started a new cycle. Possibly recurring
burns swept the area many times before wind-blown seeds began to
start advance groups of fir, which, when fifteen or twenty years
old, themselves fruited and filled the blanks between them. Perhaps
destruction was not so complete and surviving trees made the process
a swifter one. Except in the very oldest forests, where remains
of the original stand have entirely rotted away, the history in
either case may be read in ancient snags and fallen logs.
Suppose, however, that fire had not come to aid the fir in perpetuating
itself? This, too, we can answer from the signs today. Every
Northwestern woodsman knows tracts of varying size (usually small
because fire has been almost universal) covered with big old hemlock,
white fir and cedar, with here and there a dying giant fir, perhaps,
but mainly showing fir occupancy only by rotting stumps and logs. No
sign of fire is seen. When this fir forest was approaching middle
age, the shade bearing species began to appear beneath it. As the
firs began to crowd themselves out, the later comers shot up with
the increased light and filled the open places. At last the even-aged
fir forest was completely transformed into a selection forest of
other trees, which will remain until some accident again gives
fir a chance if any survives near enough to reach the spot with
seed.
Douglas fir is not the only Western tree which usually grows in
even-aged stands. Lodgepole pine has the same habit, often supplanting
yellow pine after fire or logging. Western white pine is perhaps more
tolerant than Douglas fir, hence more likely to hold its own without
artificial aid, but is also more certain to compete successfully
if it has such aid. The same is true of tamarack.
We thus see that if economic reasons suggest it, we may use the
selection system as a basis for artificially managing the shade
bearing species such as hemlock, white fir, cedar, spruce, and even
Western yellow pine. We may cut the largest and oldest trees and
still have a well started second crop. If there is not much young
growth to leave, even a little is valuable. It may be decidedly
best to leave medium sized trees, which otherwise we would cut,
because they are still growing rapidly.
On the other hand, we see that this method would not be of any
advantage at all in insuring a second crop of Douglas fir, for
there is no young growth of this species to protect. The small and
medium sized trees, instead of being immature, are merely stunted
specimens of the same age as their larger brothers and unlikely
to gain in size if left. Selection cutting here would save for
future use only such understory of shade-bearing species as may
exist. Unless this is an object, the best plan is to cut clean and
get all we can. If we leave any fir at all it is for the purpose of
reseeding, not to secure better utilization of the trees themselves,
and whether we do so depends, theoretically at least, upon whether it
is better than artificial seeding or planting. In short, selection
cutting harvests the ripest trees of a perpetual forest, while
clean cutting destroys the forest in order to start an entirely
new and more rapid growing one.
Clean cutting is therefore necessary as well as natural in dealing
with intolerant trees. But it does not follow that the selection
system, although natural to tolerant species, is the only one adaptable
to them. While the one class demands light, the other does not
demand shade. It is merely capable of enduring it. Indeed, except
for the greater susceptibility of some species to extreme heat
and dryness when very young, as a rule shade bearing trees grow
much better if they do have ample light supply. Consequently clean
cutting may be the best system for these also under certain economic
conditions.
Besides its influence upon the occurrence of species in the forest,
light practically governs the physical form of the individual tree.
If grown in an opening and not artificially pruned, a tree will have
a conical trunk and living branches almost down to the ground. The
denser and consequently darker the forest, the more cylindrical the
trunk, the smaller the crown of branches and the greater the clear
length. The individual tree has no object in assuming a desirable
commercial form and does so only when deprived of side light by
numerous neighbors. Then it sacrifices diameter growth to height
growth in reaching for the top light necessary for its life. At
the same time the lower branches are killed by shade and drop off,
the scars being healed and eventually buried. The pin knots near
the center of a big clear log are the remains of branches which
when living were at the top of the young tree.
This is why, if it is to produce good timber, any forest must be
dense enough to cover the ground throughout the early part of its
life at least. When we see an excellent clear stand of mature Douglas
fir, for example, we may know that it consists of the comparatively
few survivors of a close sapling growth in which the weak were
gradually killed out after serving their office of pruning and
forcing the vigorous. Had only the trees we now see been on the
ground they would be worthless except for firewood. For the same
reason artificial forest planting must be thick, although the fillers
or nurse trees may be of inferior species if not of so rapid growth
as to gain the mastery.
Nature teaches many lessons which we must recognize in artificial
management or fail, but she is no more the best grower of forest
crops than she is of agricultural crops. We have to study natural
methods of forest perpetuation to see how they may be improved upon
as much as to adopt them as models. As a rule the virgin forest is
exceedingly wasteful of ground. The possibilities under intelligent
care are not indicated by nature's average, but by her accidental
best, and usually they far exceed even this. A fair comparison is
that of scientific farming with unsystematic gleaning from wild
and untended fields. The foregoing general principles of forest
growth have been purposely outlined very briefly so as to serve
as a mere introduction to their application or modification in
concrete cases.
Compared with most important commercial trees, the Northwestern
Douglas fir is remarkably easy to reproduce. It is an abundant
seeder, grows very rapidly, and inhabits a region with every climatic
advantage. In the typical fir districts of Oregon and Washington
deforested land which escapes recurring fire is usually restocked
naturally and with astonishing rapidity.
The exceptions to this rule are where the destruction of seed trees
has been wide and absolute, where already established competing
species are not removed with the original forest, and where the
surviving fir is too old to seed. The two latter conditions are
most prevalent near the coast, where the wet climate not only tends
to protect slashings from fire and thus preserve the undergrowth of
shade bearing species which escapes logging, but has also prevented
the accidental destruction in the past of the original fir stand
by fire.
In considering these natural results as they bear upon proposed
methods, we find actual destruction of seed supply the easiest
to avoid. If the original stand contains suitable seed trees we
can protect a sufficient number of them. If not, or if it is less
expensive, we can secure seed elsewhere. More frequent difficulty
will lie in determining whether the reproduction of fir should
be the sole effort, or whether it should not be sacrificed, if
necessary, in order to utilize an existing start toward a second
crop of other species. This is of peculiar and early importance,
for it usually also decides the question of protecting the slashing
from fire.
If the present stand is nearly pure fir, or if other species are
represented almost wholly by merchantable trees, there will be no
young growth worth saving. A new crop must be started from seed, and
since fir is the quickest and easiest to grow, as well as probably
the most valuable, it should be given every encouragement.
Slash Burning and Its Exceptions.
In most cases this requires burning the ground after logging, not
only to reduce the future fire risk but also to provide a suitable
seedbed. Fir much prefers mineral soil to start in, as is easily
seen from the far greater frequency of seedlings on road grades
than on adjacent undisturbed ground covered with humus and rotten
wood. Hemlock has no such fastidiousness, even preferring rotten
wood as a seedbed. To protect the slashing from fire, therefore,
both preserves the most unfavorable conditions for fir and subjects
it to unnecessary competition by its rival. Hemlock seedlings already
established, seeds lying on the ground, and surrounding or surviving
trees which may scatter more seed, are all encouraged to shade and
stifle the struggling fir seedlings already handicapped by dislike
for their situation.
On the other hand, a large proportion of what we now consider typically
fir forest has a vigorous ground cover of hemlock and cedar which may
become merchantable many years before an entirely new fir crop can be
grown. The presumably greater value of the latter may be consumed by
the heavier carrying charge before returns are available. Certainly
if the promise of profit from other species and the difficulty of
establishing fir both reach the extreme, protection of the growth
already started is the best forestry if it is practicable. Moreover,
there may be considerable young growth of other species under conditions
which do not preclude satisfactory additional reseeding by fir.
When the owner is in position to plan far into the future, like the
Government or State, he may seek a temporary compromise, although
expecting eventually to secure pure fir. In such a case it may often
be best to utilize a first new crop of hemlock, but on harvesting
this a few decades hence to burn clean and start the next rotation
with fir only.
Conditions Vary Methods.
Between conditions clearly suggesting one course or another, all
gradations will present themselves and no written rule can be given
for determining the dividing line. Much depends upon future relative
values of species, upon which the owner will have his own opinion.
More depends upon the character of existing young growth and consequent
adaptability to changed conditions after logging. Even a very thick
stand of young hemlock is unlikely to produce much if the overwood
has been very dense, for much of it may be so old and stunted by shade
that sudden advent of strong light will result merely in distorted
worthless branch growth or in killing it outright. Occasional vigorous
young trees just under present merchantable size are of doubtful
value because they are likely to blow down. The most promising
class of undergrowth found in fir forests of the Northwest is where
there has been sufficient light to produce a fairly thick stand
of young hemlock or cedar from five to fifty feet high.
If the undergrowth from which any second crop may develop is
insufficient to be worth much consideration, and reseeding must
be depended upon entirely, there may still be a question as to
species. If ample natural supply of fir seed can be expected, slash
burning is indicated. But if not and the owner is not prepared to
undertake the expense of artificial seeding, while at the same
time there is a promising natural hemlock supply, burning has no
object except the reduction of future fire risk. It may even retard
hemlock reproduction, both by destroying part of the seed supply
and by encouraging the growth of brakes on the area. The question
here is a really financial one. The cost of planting fir under these
conditions may be more than reimbursed by the resultant more valuable
and rapid growing crop. The owner must do his own conjecturing as
to future comparative values of the species.
So far we have discussed slash burning only in its sylvicultural
relation, finding that it encourages Douglas fir reproduction and
is consequently advisable in Northwestern Douglas fir types unless
there is an exceptionally promising second growth already started.
The balance will be further in its favor, in doubtful cases, because
of the protective feature. This is discussed more fully in another
chapter, but it is well to recall here that immunity from recurring
fire is the first essential of profitable reforestation. To secure
second growth by treatment which threatens its destruction later
is bad management unless the original saving is ample to cover
subsequent greater cost of protection. This is seldom the case.
How to Reseed the Area.
Dismissing the exceptions noted, and returning to our rule that
another crop of Douglas fir is usually the best secured by following
nature—cutting practically clean, burning the ground and
starting a new even-aged stand—we have still to consider
means of getting this stand started. We may depend upon natural
reseeding from trees preserved for the purpose or from the surrounding
forest, or we may resort to planting. What are the comparative
advantages of these two methods and the circumstances governing
choice between them?
Hitherto, students of the subject have inclined to favor natural
reproduction. The very general second growth on deforested land
where no aid has been given indicates that excellent results will
follow slight assistance. Red fir fruits frequently and profusely,
and the seeds carry well in the wind. Burns have been known to
restock fully from seed blown from forested hills a mile or more
away. Moreover, while planting always involves initial expense,
sometimes much may be done to insure natural seeding with little
or no actual outlay.
There is danger, however, that in many instances this economy will
be more apparent than real if it is effected by actually leaving much
value in seed trees. Abroad and in the East there is comparatively
little loss in leaving even a fourth or fifth of the original stand
to furnish seed. The individual trees left may be good seeders,
although small. Little capital is tied up in them and they may
be utilized later to equal advantage. A mature fir forest of the
Pacific coast may have no small fruiting trees at all, and if left
such are likely to be knocked down in logging. To leave 20 per
cent of the large trees standing would sometimes tie up 20,000
feet to the acre, worth $40 or $50. Age and windfall may cause loss
equal to stumpage increase; moreover, they can never be utilized
without the same expense for roads and machinery that is necessary
in the original logging. The second crop will not be allowed to
reach a size requiring such equipment. In considering possible
windfall loss, not the normal wind but the possible maximum storm
within the entire life of the second crop must be reckoned with.
It is probably safe to say of mature Pacific coast fir that leaving
enough merchantable timber on a cutting area for adequate seeding
costs more than to use it and restock. Restocking can be done for
$2 to $10 an acre, which would leave a decided margin for profit
on the seed trees. And if we undertake to reduce this balance by
leaving very few seed trees, we decrease the certainty of successful
reproduction and increase the danger of entire failure through
windfall or accidental destruction when we burn the slashing. It
cannot be denied, however, that fire after planting would result
in complete loss, while seed trees might restock the area again
and again after such accidents.
Natural Reproduction.
On the other hand, natural reproduction does not always require
the leaving of merchantable timber on the cutting area. Frequently
there are enough crooked or conky trees to serve the purpose. These
defects are not directly transmissible through seed to the offspring,
although conk is infectious and the young crop should be protected
by the removal of the diseased parents after it is well started.
Again, seeding from adjacent timber can often be relied upon. This
is a question of economy in logging operations, lay of the ground,
prevailing wind direction, fertility of the stand and other local
considerations. A valley with healthy fir woods on either side is
likely to seed up promptly even if a half mile wide. So is a flat
at the leeward foot of a hill timbered on the summit where the
wind strikes. A cutting on a ridge is correspondingly unlikely to
restock. Theoretically if a tract of timber were large enough, it
could be opened up by logging operations which, instead of proceeding
steadily from one edge, might skip every other landing or so until
the most remote portion was reached after a few years, and then
work back again, cleaning up the neglected portions after they
had seeded the first openings. The same effect sometimes results
from actual accidental practice.
It is apparent that rules cannot be laid down for general application.
Generally speaking, a logger interested in fir reforestation should
study his ground to see if naturally, or, with inexpensive aid, the
cut-over area will not reseed from the sides and from the cull trees
he will leave uncut. If not, he may leave a few merchantable seed
bearing trees provided the soil is such as to make them deep-rooted
and wind-firm. Groups are better than single trees because less
likely to be blown down and easier to protect from the slashing
fire. More should be left toward the windward edge. But before
tieing up any considerable sum in merchantable trees he should
consider the cost and safety of supplementing any shortage of natural
supply by artificial seeding.
WESTERN HEMLOCK (Tsuga heterophylla)
Since hemlock is so frequently associated with Douglas fir, the
principles governing its reproduction and its relative promise as a
second crop have necessarily been largely covered in the preceding
discussion of fir. The following remarks are merely additional.
We have seen that the perpetuation of hemlock is advisable only
where fir reproduction is difficult to obtain or will be at too
great a sacrifice of valuable existing hemlock. The first of these
conditions is confined chiefly to pure hemlock stands and to coast
regions where the fir is often too old to seed well. The second
may exist on the coast or in certain moist interior regions where
there is a heavy hemlock undergrowth. In either case natural hemlock
reproduction will be counted upon, both because it is practically
certain to occur and because if it were not certain and artificial
aid were necessary, we would abandon hemlock entirely and devote
our efforts to fir. In short, discussion of hemlock as a second
crop need not include systematic attempts to seed the ground but
may be confined to protection of what we have to begin with.
In a straight hemlock proposition, the protection question may
differ considerably from that involved by deciding between fir
and hemlock. In the latter case, because of the assistance of fire
to fir, the growth already on the ground must have considerable
value to warrant foregoing the several advantages of slash burning.
In the former, slash burning has no object except to reduce future
risk. The inference is that a much less promising stock of young
growth is worth protecting.
While this is true, there is danger of overestimating its value,
especially if care is not taken in logging. It has been remarked
that suppressed misshapen hemlock is not apt to make a healthy
growth, that windfall is a peril, and that if the previous shade has
been heavy, sudden opening to sunlight may be fatal. It should also
be remembered that even slightly injured young hemlock is worthless,
for it is almost certain to be attacked by borers. Anything which
deadens a small portion of the bark like axe blazes, fire scorch,
or scars from strap leads, is dangerous. Hemlock is more liable than
fir to general defects like black streak, borers, fungous disease
and mistletoe, therefore investment in reforestation needs the
maximum safeguard against them. In many instances better results may
be obtained from a new healthy seedling stand following a purifying
fire, even at some loss of time, than from well started young growth
which is unhealthy and likely not only to fail itself but also to
infect any seedlings which may come in among it. Consequently if
the slashing is not large, and reproduction from the sides may be
counted on, the above considerations, coupled with the reduction
of future fire risk, may suggest slash burning just as in the case
of fir. The remarks apply particularly if it is considered necessary
to log as clean as possible.
With a good, healthy start toward a new forest, however, it will
usually be best to keep fire out, for the material saved will warrant
greater expense in protection during the growing period. Representative
tracts, both on the coast and in the Cascades, have been studied
which showed that, with care in lumbering, enough good young hemlock
too small for logs or skids could be saved after present-day logging
of a heavy mixed fir and hemlock stand to produce in fifty years
11,000 or 12,000 feet of timber over 14 inches in diameter. This
would not be wholly additional to the second crop of seedlings
which might be produced if these trees were not preserved, for
the ground and light they use would be denied to the seedlings,
but undoubtedly the yield would be greater than could be secured
if they were destroyed.
This means that under similar conditions we may go still further
and actually apply the selection system, especially if the original
stand is nearly pure hemlock. So far we have discussed areas left
by present-day logging methods. Suppose, however, the owner of a
good tract of hemlock, having decided that conditions do not warrant
trying to get fir, is willing to modify his methods for the sake of
better hemlock returns at some future cutting. He would probably
do best to take out only the mature trees, leaving everything which
is still growing with fair rapidity. Greater light will stimulate
these immensely as well as encourage further seeding of the ground.
The few merchantable trees he spares, together with those now
unmerchantable, will, in perhaps twenty years, make another excellent
crop. By leaving a fairly dense stand he prevents the windfall
danger which threatens the survivors of too vigorous cutting, and
also prevents them from assuming the branchy form of trees which
receive too much side light. The fire danger is much reduced by
resultant shading of the ground and slightly by the lesser cover of
debris. In short, he makes the most economical use of the ground,
and the capital represented by the trees he spares is well invested.
To sum up, hemlock lends itself to almost every form of management.
Determination as to which is most advisable is governed by its
extremely variable manner of occurrence and by the local promise
offered by associate species. The foregoing discussion can only
serve as suggestive when considering given conditions.
WESTERN CEDAR (Thuya plicata)
Except for small swamp and river bottom areas, where the land is
likely to be more valuable for agriculture than for forest culture,
pure cedar stands are not common. Therefore it is as a component of
mixed stands that cedar is likely to become a problem in conservative
management. To some extent it presents a peculiar question by being
taken out alone for special purposes, such as poles and bolts,
independent of ordinary logging of sawtimber.
Western cedar is a typically shade-bearing tree and also endures
much ground moisture. Its occurrence as an under story and in swamps
does not indicate that it always requires such conditions, however,
but more often means merely that they protected it from competition
or from destruction by fire. Charred remains of very large, fine
cedar are often found on comparatively dry slopes where fire has
resulted in complete occupation by fir at present. Cedar's failure
to reappear there after removal is probably because its thin bark and
shallow roots allowed its destruction by a fire which was survived
by some better protected fir seed trees. Nevertheless, cedar must
be classified as a moisture-loving species and occupies dry soils
only in coast or mountain localities where there is a compensating
heavy rainfall.
Reproduction and management of western cedar have not been sufficiently
studied to warrant very positive conclusions. This neglect is probably
due to a wide belief that in spite of its present commercial importance,
its place in the future forest will be small. It most commonly occurs
with other trees in heavy stands, which make the preservation of any
young cedar difficult because of the destructiveness of logging. Being
of comparatively slow growth, also persistent in retaining branches
when grown in the light, it is not as promising for artificial
reproduction as Douglas fir or white pine. To let it become old
enough for good shingle material will be too expensive to pay,
for roofing is one of the wood products easiest to substitute for.
While cedar is adapted for poles, posts and other underground use,
less decay-resisting species can be made equally durable by chemical
treatment. In other words, as a second crop it is probably below
other species in ease of establishment, rapidity and quantity, and
will not have sufficient peculiar value to compensate for consequent
less economical use of the ground.
There may be exceptions to this rule. Good young cedar in forests
which are to be handled under the selection system should be carefully
protected. It can always be utilized and may bring revenue before
anything else can be cut. For the same reason it has been suggested
for planting with fir and white pine, either simultaneously as a
small proportion or later in blank spaces where the others fail.
Under such conditions the main stand will not be modified and the
cedar will afford a valuable adjunct.
Although found in the moister mountain regions, this exceedingly
valuable tree seldom occurs to a commercially important extent
except along the coast, where it is common on swales and fertile
benches and in river bottoms often forms pure stands of great density.
Yields of 100,000 feet an acre are not unusual and the trees are
very large. It is also common, although of small size, in swamps.
This spruce reproduces readily in openings, whether made by fire
or cutting. Unthrifty specimens may be found under shade, but
considerable light is necessary for successful development. Even
then, height growth in youth averages slower than that of fir or
hemlock. The leader shoot is likely to die, so that hardly more
than 25 per cent of the young trees establish a regular form of
growth before a height of 20 or 30 feet is reached. After this
stage spruce grows uniformly and rapidly, still somewhat slower
than fir in height but exceeding it in diameter. The branches are
slow to die, however, so that the tree remains bushy for most of its
length until it reaches 60 or 80 feet in height, and even afterward
a dense stand is required to clear it. In many pure spruce forests
the larger trees have been able to withstand the pruning influences
and remain limby, while the smaller ones, being pushed in height
growth to reach sufficient light for survival, have cleared themselves
with remarkable rapidity.
The natural occurrence of Sitka spruce, except in Alaska, is probably
limited chiefly to situations where it escapes competition, in
youth at least, with the more hardy and rapid-growing species. It
has the greatest advantage over these on river bottoms and flats
where there is a dense growth of deciduous brush and where the
soil is very wet in spring. In considering it as a possible second
crop, the same competition must be remembered. Whether seeding is
natural or artificial, the extent to which it will hold its own
with any considerable quantity of other species is doubtful. If
such are present and the situation is adapted to them, any expensive
effort to get spruce merely by modifying methods of logging or
handling the slash is certainly likely to be disappointing. Under
the conditions mentioned as peculiarly favorable for spruce, gradual
natural restocking may be expected if some seed supply is preserved,
but since the growth is rather slow and a thin stand will remain
limby, it may pay to hasten returns by supplementary artificial
planting. Some authorities question the financial practicability
of this on the ground that since spruce is of slower growth it will
pay better to use the ground for fir, but the latter is unlikely
to be true of bottom land.
After summing all its advantages, the peculiar merits of spruce for
certain purposes should be weighed, for sufficiently higher stumpage
value will compensate for delay in harvesting the crop. Moreover,
Sitka spruce has not been as thoroughly studied by foresters as
the more prominent Western trees, and while the foregoing notes
represent general present opinion, further figures on rate of height
growth may be more encouraging. There is no doubt that diameter
increase is rapid from the start. Most of the disadvantages mentioned
also decrease toward the southern limit of the spruce range, the
growth on the Oregon Coast being rapid.
In this species we have the important western conifer which most
often permits the selection system of management. With certain
exceptions in which the entire stand is mature, the object of
conservative logging should be to remove trees past the age of rapid
growth and foster those that remain for a later cut. When comprising
the entire stand, or at least clearly dominating it, with all ages
fairly evenly represented, successful in reproduction, and not so
dense as to present mechanical difficulties, it is ideally adapted
to this form of management. The important underlying principle is
that, since for a period of its life the normal individual tree
increases in wood production and then declines, it is bad economy
to cut it while it is still growing rapidly or to allow it, after
slowing down, to occupy ground which might be used by a tree still
in the vigor of production. For example, if at 100 years old it
contains 500 board feet, it has averaged an addition of 5 feet,
a year throughout its life. If at 125 years old it contains but
560 feet, the average increment will be but 4-1/2 feet a year.
It will not give equal return for the soil, moisture and light
it monopolizes during these 25 years. At the same time, probably
there are young trees nearby which hitherto have averaged below
the maximum, but if released from its competition will forge ahead
for a period at the end of which they will give a greater annual
return than if cut at present. It would be as bad economy to cut
these today as to spare the over-mature tree. In short, the production
of the forest is not only sustained, but actually increased, by
removing the oldest trees at just the proper time; and is decreased
by taking out young trees either not yet at the natural age of
greatest mean annual increment or capable of artificial stimulation
by thinning.
By studying the relation of age to production in the particular
locality, the proportion of different age classes, and also finding
the approximate average diameter which corresponds to the age at
which he desires to cut, the professional forester can make a very
accurate selection of the trees which can be removed to best advantage
at present and also fix the time and yield of the next cutting.
Fortunately, however, commercial and silvicultural considerations
accidentally coincide so nearly under average yellow pine conditions
as to make certain rough rules which can be laid down entirely
consistent with logging methods now in practice. Diameter is far
from exact indication of age, for the location of the forest and
the situation of the individual tree, especially as it affects the
relation between height and diameter growth, are potent factors,
but as a rule merchantability for saw-material is not far from
maturity.
In a great majority of cases the approximate minimum diameter for
cutting which would be fixed by it forester would be somewhere
between 16 and 30 inches, but say it were 18 inches, for example,
it would not arbitrarily apply throughout the stand. Most trees with
yellow, smooth bark and small heavy-limbed tops, perhaps partially
dead, are mature regardless of their size. If small, they have
been crowded or stunted and may as well be cut. Trees with large,
healthy crowns composed of many comparatively small branches, and
with rough dark bark showing no flat scaling, are sure to be growing
rapidly, even if quite large. They are also less desired by the
lumberman, who often calls them black pine or black jack, so may
often be spared, without much sacrifice, for seed trees or in order
to continue their rapid wood production.
The seed tree problem in such a pine forest and under such a system
as has been described is comparatively simple, for there are likely
to be enough young trees of fruiting age left to fill up the blanks
between existing seedlings. The density of the latter determines
to a large extent the number and location of seed trees necessary,
but there should always be two to four to the acre, even if this
requires leaving some that would otherwise be logged.
Under this system recurring cuts may be made at periods of perhaps
30 or 40 years, taking out each time the trees which have passed
the minimum diameter since the last previous cut. It is obvious,
however, that if the process is to continue indefinitely, protection
must be absolute. Destruction of young growth will stop the rotation
at the time the surviving older material is harvested. At each
cut the brush should be disposed of with this end in view. If the
stand is very thin it may not add much to the danger of fire and,
especially if reproduction is difficult and requires shelter, may
best be left spread on the ground at some distance from remaining
trees. Otherwise, and this is the rule, it should be piled and
usually burned. In this process and in logging every effort should
be made to protect existing young growth from injury. Ground fires
should be prevented now and always hereafter.
So far, however, we have been considering how to make the most
of a stand of many ages, due to constant reproduction permitted
by the light supply in a fairly open forest. On the other hand,
yellow pine sometimes produces a mature stand so heavy that there
is little young growth beneath it, or even a thin old stand with
either little reproduction or an invasion of lodge-pole pine. Such
conditions are usually due to fire at some period. In the first
of these cases, usually the dense stand has resulted from a fire
which destroyed its predecessor not so completely as to remove the
seed supply, but sufficiently to afford light for a more uniformly
dense crop of seedlings than would occur in the normal forest.
These have been thinned out as the stand grew old, but never to a
degree which allowed much reproduction beneath them. The natural
cycle will be begun again in time, for toward the end of the life of
this unusually heavy stand, seedlings will begin to appear gradually
as individual old trees die and admit more and more light. The
other exceptions described are due to more recent ground fires
which have destroyed only the less hardy young growth and perhaps
also encouraged the lodge pole which, within its range, is always
quick to take burned ground.
The same result is almost sure to follow the "Indian" method of
forest protection sometimes advocated, which consists of purposely
running ground fires frequently in order to prevent accumulation
of sufficient debris to make an accidental fire fatal to timber of
commercial size. While such immunity may be secured, and perhaps
without sacrifice in stands so heavy as to have no reproduction
or when the latter has already been destroyed, it is obviously at
the expense of young growth if any exists. The counter argument
that a small proportion escaping will be sufficient for the second
crop is fallacious, because good timber will not be produced from
these scattering seedlings subjected to strong light by later logging.
Other means are necessary if the forest is to be reproduced.
This brings us to the possible management of yellow pine as an
even-aged forest. Thoughtful foresters are beginning to suspect
that while the "Indian" system of fire protection will usually
be fatal if ordinary logging practice is followed, it may serve
as an adjunct to a system which, if carefully applied, will be
better than selection cutting for some of our pine areas. This plan
is suggested where there is little young growth worth protecting
and consists of depending upon seed trees almost entirely for
reproduction, protecting carefully until the resultant even-aged
second growth is large enough to stand Blight fire, and then burning
periodically at such a season and with such safeguards as will
prevent the fire from being injuriously severe.
Not only are there many existing forests where absence of small trees
will permit clean cutting without sacrifice, but the same condition
is likely to occur eventually in stands following selective logging
if the second cut is long delayed. Although a good representation
of all ages under the diameter limit remains, the density of this
may become too great to allow further reproduction, and in time
the dominant trees will shade out all smaller growth. To allow this
purposely, choosing heavy cuts at intervals long enough to mature
the crop from seed rather than frequent light cuts of a constantly
replenishing stand, thus reducing the necessity of fire prevention,
is the aim of those who favor clean cutting as the most practicable
system. They assume that additional investment in seed trees, or
planting to insure prompt starting of a new crop after cutting,
will be unnecessary or at least offset by the smaller fire charge
and greater economy of logging.
Theoretically, such practice with a species adapted to the selective
method is uneconomical, for the ground is not fully utilized. Accidental
open places in the stand are not occupied by young trees which would
otherwise fill them. Time is lost by not starting the second crop
until after logging, for were there no fire previously there would
be considerable seedling growth which, although perhaps dormant
because of shade, would begin to amount to something much quicker than
that supplied by seed trees afterward. Nor is the system feasible
where there is much fir or other species less fire-resisting than
pine. It is dangerous in practice except where there is very little
combustible matter on the ground and fire is generally easy of
control, and exceedingly dangerous to advocate because serves as a
pretext and example for indiscriminate carelessness with fire under
all conditions. Finally, the alleged immunity of pine from injury by
ground fires is exaggerated. As a matter of fact, while the whole
stand is seldom perceptibly hurt, the immediate or gradual death of
a good tree here and there thins the stand very considerably in a
few years and it is such a thinning process in the past which makes
many pine tracts bear but 5,000 feet to the acre where otherwise
they would yield two or three times as much. Scorching also retards
the growth of trees not actually injured otherwise.
The technical objections given above may sometimes be offset by
practical advantages and the system is likely to receive expert
approval for certain conditions provided it is not used as a cloak
without taking sincere steps to replace the destroyed second growth
by adequate seed trees or artificial seeding. The latter danger may
easily warrant public alarm manifested by restrictive laws. Universal
ground burning of green timber will distinctly reduce the prospect
of unassisted natural reforestation on the great area of potential
timber land in which, as a resource, regardless of ownership, the
public is vitally interested. Under present conditions at least,
a large proportion of this is likely to be logged without any view
to a future crop. It is questionable whether any state should, or
will, legally approve ground burning except under stipulation of
proper management thereafter.
Unfortunately, it is necessary, in concluding this discussion of
yellow pine, to admit that while an attempt has been made to outline
the methods which will insure a second crop, the promise of satisfactory
financial return is more doubtful than that offered by some other
species. Compared with the typical coast trees, such as Douglas
fir, spruce and hemlock, the growth is slow and the yield small.
The chief circumstances in its favor are low land values, lesser
fire risk, cheapness and certainty of reproduction and excellent
market prospects. Less investment compensates somewhat for longer
rotation and smaller yield. Low taxation, however, is an absolute
essential.
Although as a distinct forest type this valuable tree is limited
chiefly to Idaho, it occurs occasionally in mixture or small tracts
over a wide range, and no reason appears why its commercial importance
should not be extended by planting on cut-over lands. Its high value,
rapid growth and heavy yield make it a particularly promising species
for growing under forestry principles. Its chief requirements for
success are fairly good moist land, access by the seed to mineral
soil and ample light for the young seedlings.
Except that it is more fastidious as to soil, white pine usually
demands about the same treatment as that prescribed for Douglas
fir, including clean cutting, slash burning and establishing a
new even-aged stand by seed trees or artificial restocking. Under
favorable conditions the stand is nearly even-aged, with little
undergrowth except of undesirable species. What small pine may
exist is seldom thrifty enough to be worth saving, so the best
thing is to clean off the ground for the double purpose of removing
weed trees and favoring valuable reproduction. Like that of fir,
the natural rotation of white pine forests seems to have been
accomplished often by the aid of fire, and where not given this aid
it suffers from lack of suitable seed-bed and from the competition
of other species already established.
Individual seed trees left in logging are not successful because
of shallow root system and almost certain windfall. Replacement
must be by seeding or planting, or by leaving small tracts of pine
surrounded by cleared fire lines to protect them when the slashing
is burned. The size and distance apart of these must be determined
by their situation and exposure to wind, considering both the danger
of windfall and the carrying of seed. Especially in younger growths,
the quantity of merchantable material tied up in this way is not
so great as is sometimes necessary in the case of red fir, where
single seed trees may contain several thousand board feet. On the
other hand, stumpage value may be high. For this reason artificial
replacement may often be more profitable, especially where there
is reasonable safety against recurring fire.
A thing to be borne in mind is that white pine seems to reach a
healthier and better development when mixed with a small proportion
of other species, such as cedar, tamarack, spruce, lodgepole pine
and Douglas fir, so there is no object in trying to produce an
absolutely pure stand. Some authorities think that 60 per cent
of pine, with the rest helping to prune it, is an ideal mixture.
Present interest in private reproduction of this species hardly
warrants treating it at length in this publication, although
unquestionably it will eventually occupy a higher place in the
market than at present and its readiness to seize burned land in
many regions will make it a factor whether desired or not. Where
yellow pine will grow, the problem is most likely to be to discourage
lodgepole competition.
In strictly lodgepole territory, however, it may be the only promise
of a new forest. Generally speaking, an even-aged growth should
be induced by clean cutting if the entire crop can be utilized.
Slash burning in such cases is desirable. The chief difficulty
is in providing seed supply, for either individual seed trees or
small groups are almost certain to be blown down. Experiments so
far indicate that heavy strips must be spared, chosen to afford
the least present loss and safeguarded by fire lines.
In some lodgepole stands, especially where only certain sizes are
marketable, the cutting practically amounts to thinning. Here obviously
the effort should be to prevent over-thinning and to remove debris
with the least damage to the remaining stand. Piling and burning
is essential.
This extremely valuable pine, commercially limited to the Oregon and
California mountains, is fastidious in its choice of conditions. Not
a frequent or prolific seed bearer, it still insists on a moist loose
seed-bed and prefers the natural forest floor to burned-over land. It
cannot stand drought when young and except on cool northern slopes
seedlings may be killed or stunted by exposure to full sunlight. On
the contrary it demands more and more light as it grows older and
will be suppressed or killed if unable to secure it. Under natural
conditions it perpetuates itself best by filling open places in
the forest.
For the above reasons, sugar pine is naturally a component of mixed
forests and it is doubtful whether it will be successfully grown as
a pure stand. Unfortunately, also, logging methods which are both
the simplest and most favorable to the reproduction of its associates
may be discouraging to sugar pine reproduction. Nevertheless, its
value warrants strong efforts to favor it and is an argument, where
considerable young sugar pine exists, against either clean cutting
or the use of fire.
The Forest Service, for which authority much of the above discussion
of this species was taken, offers the following general outline
for management in California:
"Since the forests in which sugar and yellow pine occur vary greatly
in composition, the method of treatment must also vary. For this
the forest types already distinguished may form a basis.
"On the lower portion of the sugar pine-yellow pine type, where
sugar pine forms but a small proportion of the stand, only the yellow
pine should be considered for the future forest. All merchantable
sugar pine may therefore be removed. It will be necessary to leave
only a few seed trees of yellow pine to restock the ground, although
usually it will be a wiser policy to leave a fair stand, since
this can be removed as a second cutting when reproduction is
established. This procedure would also hold for areas on which yellow
pine occurs in nearly pure stands. In these localities dense stands
of second-growth yellow pine occur. It will often be profitable,
where there is a market at hand, to thin these stands when they
are about 30 years old, removing the suppressed trees for mine
props. Trees 6, 8 and 10 inches and up are used for this purpose,
and sell for from 5 to 6 cents a running foot.
"On the upper portion of the sugar pine-yellow pine type, where
both species have about an equal representation in the stand, seed
trees of each should be left, wherever practicable, in the proportion
of two sugar pines to one yellow pine."
In the fir belt, where sugar pine and fir are the principal species,
the fir should be cut clean wherever possible and sugar pine should
be relied upon for the future forest.
"On all lands, the Douglas spruce, white fir and incense cedar
should be cut whenever possible, and chutes, skidways and bridges
should be constructed from the two last named species."
The following specific instructions are issued for marking timber
on National Forest sales in the sugar pine-yellow pine type:
"Owing to the large size of the trees, marking in this type of
forest should be done with special care, since a slight mistake
involves a comparatively large amount of timber.
"On nearly all of the lands included in this type the ground is
now but partly and insufficiently stocked with young timber, the
areas of forest are constantly becoming more accessible to markets,
and there is every indication of a strong future demand at greatly
increased prices. On nearly every tract, a second cut can be made
within thirty years. All marking under present sales should be
done strictly with reference to two points:
"1. Stocking the cut-over land as fully as possible with sugar and
yellow pine.
"2. Securing a second cut within thirty years.
"All cutting should be done under the 'selection system,' which
requires a careful choice of the individual trees to be removed.
Fixed diameter limits and the leaving of any specified number of
seed trees per acre can be very largely disregarded.
"The condition of every sugar and yellow pine on the sale area
should be studied closely to determine whether that tree will be
merchantable thirty years hence, by which time a second cut is
probable. As a rule the trees which will remain merchantable for
another thirty years should be left. Suppressed and crowded trees
which cannot develop should be removed. Under this system of marking,
ordinarily about one-half of the present stand of merchantable
pine would be left uncut. Will it pay?
"On areas where practically all of the pine is over-matured and
would be cut under the rule given above, a sufficient stand must be
left to reseed thoroughly the cut-over land. This requires not less
than four full seed-bearing trees, at least 25 inches in diameter,
per acre. The strongest and thriftiest trees available should be
selected for this purpose, but not less than the number specified
must be left even if every tree will be a total loss before a second
cut is possible.
"Extensive areas of pine timber which are not yet fully mature
should be excluded from the sale. On patches or small areas of
immature pine, which it is not practicable to exclude from the
sale, cutting should be very light, limited to one-third or less
of the largest trees, or omitted altogether.
"No attempt to discriminate sharply between sugar and yellow pine
should be made, as both trees are almost equally desirable. Where a
choice is necessary, sugar pine should be favored on moist situations,
as in canyons, moist pockets, or benches and on northerly exposures.
Yellow pine should be favored on dry situations, including exposed
ridges and southern exposures.
"Fir and incense cedar should be marked, as a rule, to as low a
diameter as these trees are merchantable in order to reduce the
proportion of these species in coming reproduction. It is essential,
however, that no large openings be made in the present stand since
the exposed ground is in danger of reverting to chaparral or of
becoming so dry from evaporation that no reproduction will follow
cutting. Where the stand of pine is insufficient to reseed thoroughly
and protect the cut-over area, enough sound, thrifty fir and cedar
should be left to form a fairly even cover with openings less than
a quarter of an acre in size.'"
The under current of all opinion upon sugar pine up to date is
that reproduction will not be very successful unless enough growth
to shelter the seedlings remains after logging. Where the fire
risk permits, the same end may be furthered by leaving the tops
scattered on the ground.
Little experimenting has been done in planting sugar pine, but
there are many indications that except where conditions strongly
favor natural reproduction it will be resorted to eventually if
any particular attempt is made to get this species. Leaving large
seed trees is not only expensive, but rather uncertain, because
heavy seed years are several years apart and squirrels consume a
large portion of an ordinary crop. Transplants which have received
nursery shelter until past the greatest danger of drying out should
prove most successful on heavily-cut south slopes.
Although probably the most rapid-growing of all American commercial
trees and also of high market standing, redwood has been little
studied by foresters. The layman is still more confused by its many
peculiarities. Growing to a size of 20 feet in diameter and 350 feet
high, reaching an age of well over 1,000 years and seldom reproducing
by means of seed, it is not surprising that it was long regarded
as ill-adapted to second crop management. Although observing that
suckers sprout from the stumps with great rapidity, the lumberman
generally regarded these mushroom growths as abnormal and temporary,
and believed his virgin timber to be the finally-vanishing remnant
of a prehistoric species unsuited to present-day conditions.
It was next discovered that the suckering habit is no new one,
indeed that the majority of the present stand, however old, began
as sprouts from roots or stumps of its predecessors. This is evident
from the circular arrangement of several trees around the spot where
their parent stood. These old sprouts were of very slow growth,
for they were shaded by a forest of extreme density. As seedlings
they could have neither germinated nor grown, but as suckers they
were kept alive by the parent until light supply became available
through their increasing height or through thinning of the forest.
Under such conditions centuries were required to produce large
trees.
The owner of today, by cutting down the old stand, gives the suckers
conditions hitherto unknown to the redwood. The vigor and susceptibility
to the aid of light, which originally was necessary in the sprout
growth to perpetuate the species at all, now respond to entire
freedom and light in an astonishing manner. Even after severe slashing
fires char the stumps, the latter throw out clusters of sprouts
which grow several feet a year. Logging works 30 or 40 years old
have come up to trees nearly 100 feet high. Naturally such timber
has a heavy percentage of sapwood and is soft and brittle, but
it is already suitable for piling, box lumber and like purposes
and improves constantly.
Since reproduction by seed does not enter into the problem, financial
possibilities depend almost wholly on the nature of the original
stand. There are many types of redwood forest, pure and mixed,
flat and slope. If the old trees are few to the acre, the sprout
clusters will be so far apart that excess of side light will produce
clumps of swell-butted, short limby trees, of little use for lumber;
that is, unless there is also a seedling growth of fir or other
species to fill the blanks and bring up the density. Where such a
nurse growth is to be counted on, or where the redwood trees are
small and close together, ideal conditions for a certain, rapid
and well formed second crop exist.
The thinner the original redwood stand, the greater the effort
necessary at the time of logging to obtain the required density. The
leaving of seed trees of other species, with as many as possible small
trees of both redwood and other species and the maximum protection
of all from fire, should then be the means employed. On some tracts
the proportion of redwood will not warrant this effort; on some
it is not even required. The question of whether it pays to hold
redwood land is therefore almost wholly local, but when conditions
are favorable it can be answered affirmatively, because of the
extremely rapid growth, with less doubt than of almost any other
species.
There is some tendency to over-production of sprouts by redwood
stumps. Removal of the excess with an ax, saving those closest
to the ground and not over-thinning to the extent of reducing the
density conducive to height growth and shedding of low branches,
improves the chances of those remaining.
It has been shown in a previous chapter that the owner of deforested
land who desires to secure a second crop may find it necessary or
cheaper to adopt artificial measures wholly or in part instead
of depending upon natural reproduction. These measures may be of
two kinds—direct seeding, in which the seed is sown where
the trees are to stand permanently, and the planting of trees grown
in nurseries.
Whether artificial reforestation is accomplished by means of sowing
seed or planting trees, the first requisite is a supply of tree seed
of the desired species and of good quality. Unfortunately for the
timber owner who wishes to enter upon extensive seeding operations,
the business of collecting and preparing forest tree seed for market
has received but little attention from old-established seed firms,
and it is not always possible to purchase the species and quantity
desired. Moreover, the prices charged are often excessive.
In the Pacific Northwest, however, the demand for seed of Douglas
fir and Sitka spruce has led to the establishment of a considerable
trade in these species, and at reasonable prices, so that where
these species are to be used, or only small quantities of other
species, the timber owner will probably find it to his advantage
to purchase the seed rather than to attempt collecting it himself.
Douglas fir seed is quoted at $1.40 to $2.00 per pound and Sitka
spruce seed at $2.25 to $3.00.
In purchasing seed it is common practice to specify that it shall
be of the new crop, because tree seed kept in ordinary storage
loses its vitality materially. When properly stored in air-tight
receptacles, however, as is now done by some seed dealers, it will
retain its germinative power for several years with only slight
depreciation. Moreover, fresh seed, if improperly treated, may
be of very poor quality, so that the age of the seed is of little
value in the determination of its worth and the only sure method
of ascertaining this is by means of germination or cutting tests.
The latter method is the quickest and most simple and consists
of cutting open a number of the seeds and ascertaining the per
cent whose kernel is sound, plump and moist. Seed of good average
quality should contain not more than 25-30 per cent of infertile
seed.
When seed cannot be purchased, it is necessary to collect. Since
no species of coniferous trees bear abundant crops of seed each
year and often several seasons will elapse between good crops, it
is necessary to gather sufficient seed when the supply is abundant
to provide for succeeding years when the crop is apt to be a failure.
The seed ripens in the fall, usually during August or September,
and the cones should be collected at that time. Pines require two
years in which to mature the seed; that is, the cones are not fully
formed and the seed ripe until the second fall after the fertilization
of the flowers in the spring. Most of the other important conifers
ripen their seed in the fall of the same season. Shortly after
the seed is ripe, the cones open and allow it to disseminate,
consequently they must be gathered before this occurs.
The cones are gathered either by climbing the trees and cutting
them off from the branches, by picking from the tops of felled
trees, or by robbing squirrels' hoards. Where squirrels are abundant
in the forest, the last method is the cheapest. Climbing trees
is practiced only where the trees are small. When this method is
employed, the workmen should be equipped with linemen's belts and
climbers. Picking from felled trees is readily carried on except
where dense underbrush interferes, as is the case in the ordinary
Douglas fir forest.
Trees growing in the open, with large crowns extending down the
greater part of the bole, bear cones more abundantly than trees
in dense forests, and for this reason collecting from scattered
open growths can be done more cheaply than on logging areas. Often
large quantities of cones can be purchased from settlers who will
collect and deliver them at central points at a stipulated price.
When this method is employed, however, frequent examination of
the cones should be made to ascertain that they contain the full
number of seed, for often opened cones from which a part or all
of the seed has been disseminated will be offered for sale. Insect
larvæ also often destroy a large proportion of the seed,
particularly when the crop is light and care should be taken that
the cones purchased are not infested. The prices paid for cones
vary from 25 cents to 50 cents per sack for the larger cones, like
yellow and white pine, and 50 cents to $1.00 for Douglas fir and
spruce, depending upon the abundance of the crop.
After the cones are gathered the seed must be extracted and cleaned.
Where climatic conditions in the fall of the year will permit
air-drying, the cones may be spread out on sheets or blankets where
they will be exposed to the sun and wind. Under this treatment
they will open in from 3 to 6 days, depending upon the weather
and the species. Where bad weather will interfere with air-drying,
the cones must be dried undercover by artificial heat. This is the
method usually employed by professional seed collectors, and where
large quantities of cones are to be treated each year special dry
houses are constructed and fitted with elaborate drying apparatus.
The work can be done most cheaply with such an establishment, but
for the ordinary timber owner who expects to collect seed only
occasionally, a makeshift dry-house which will answer the purpose
can be fitted up inexpensively in any unused building. The essential
features are shelves or trays 4 feet wide arranged around the walls
of the room, one above the other and separated about 8 inches apart,
and a heating stove placed in the center of the room. The shelves
may be made of burlap stretched tight, or, better still, of wire
screening of 1-1/2 inch or 3/4-inch mesh.
After being subjected to a temperature not exceeding 110° Fahr.
for from 24 to 48 hours, the cones will open, allowing the seed to
fall out when shaken or pounded. The seed when separated from the
cones is then mixed with a coarse gravel in about the proportion
of 4 to 1 and churned to remove the wings. Finally, all foreign
matter is removed by screening and hollow seed blown out by passing
it through an ordinary fanning mill.
The selection of the method of reforestation to employ, whether
direct seeding or planting, depends primarily upon the character
of the area to be restocked. Direct seeding is usually considerably
cheaper when the results are satisfactory, but only on the more
favorable sites where moisture and soil conditions are right is
there any assurance of success. Even in such cases partial or total
destruction of the seed often results from birds and rodents. In
exposed situations where the soil is shallow, or where because of
climatic conditions soil dries out several inches deep during the
growing season, the seed may not germinate at all, or the young
seedlings may be killed before they have time to send their roots
down to the permanent moisture level. In such situations, planting
is the only reliable method. If the plant material is of the proper
kind and the work well done, satisfactory results are almost certain
to follow. Direct seeding is a much more rapid method than planting,
and where extensive areas are to be restocked within a short period
and seed is abundant, the work can be completed quickly. On the other
hand, this method is wasteful of seed because a large proportion
fails to germinate and the young seedlings often succumb to adverse
conditions, so that where seed is scarce or its cost high, planting
is the more practical method.
Because planting is the most reliable method it has been the one
most largely employed in extensive operations, both here and in
most European counties, but thorough tests are now being made of
direct seeding and under proper conditions it promises to be fairly
satisfactory. The Douglas fir region west of the Cascade Mountains
offers the most favorable conditions for direct seeding and except
on badly exposed south slopes, or where the growth of brush is
exceedingly dense, it is believed this method will prove a satisfactory
one for the timber owner to employ.
In the yellow pine regions conditions are not so satisfactory for
direct seeding, since this tree occurs largely in a region of deficient
rainfall. However, natural reproduction is abundant throughout
many portions of this type, and it is probable that direct seeding
will prove fairly successful if the proper methods are employed
and if forest conditions have not been too greatly disturbed. That
some method of successfully employing direct seeding with yellow
pine be found is greatly to be desired, since yellow pine seedlings
do not withstand transplanting well, but there is need for careful
experimentation before extensive seeding operations in this type
by private timber owners would be justifiable.
Western white pine, it is believed, will be easy to reproduce in
most of its native situations by direct seeding, though the greater
scarcity of its seed and the fact that it will be more subject to
destruction by birds and rodents because of its larger size may
make planting the more practical method.
Trees for planting can either be purchased from commercial nurserymen
or grown in nurseries established for that purpose near the planting
site. When only a few thousand trees are needed it is cheaper to
purchase them, but when extensive operations are contemplated,
covering hundreds of acres in which millions of trees will be needed,
it is far preferable for the owner to grow the trees in his own
nursery. Some initial outlay for the establishment of the nursery
will be necessary and a practical nurseryman should be employed,
but the saving in the cost of the trees will fully compensate for
these.
One, two and three year old trees, the latter once transplanted,
are usually employed in planting, the older trees being used for
the less favorable sites. In planting they are placed in rows
equidistant apart, the spacing varying from 4 to 12 feet, with a
general average of about 6 feet. The work may be done either in
the fall after growth has ceased or in the spring before growth
commences.
The cost of planting, of course, will vary greatly with the age of
the trees, the number planted per acre and the accessibility and
character of the planting site. With young trees and wide spacing,
the cost may be as low as $6.00 per acre, while in more unfavorable
situations where older plants are used and planting is more laborious
it may be as high as $16.00. A fair average, however, for those
areas which a timber owner would be most likely to plant up is
about $8.00 to $10.00 per acre.
In direct seeding, several different methods may be employed, such
as broadcasting over the entire area with or without previous
preparation of the soil, sowing in strips, or sowing in seed spots;
but observation and experiment have shown that it is necessary for
seed such as Douglas fir, yellow pine and western white pine to
come in close contact with the mineral soil in order that it may
germinate and the seedlings live; consequently only those methods
should be used which will accomplish this. Where the area has been
burned over previous to sowing and the mineral soil laid bare,
broadcast seeding may be employed. Where the ground will permit
the use of a harrow good results are obtainable by scarifying the
soil in strips about 10 feet apart and sowing the seed in these
strips. On unburned areas covered with a dense growth of fern,
salal, moss, grass, or other plants, this covering must be removed
by the seed spot method. This consists in removing the ground cover
with a grub hoe or mattock in spots of varying diameter (6 inches to
3 feet) and of various distances apart (6 to 15 feet), and sowing
the seed in these spots. The advantages of this method are that
a minimum amount of seed is used; the ground can be prepared and
the seed covered to whatever extent is desirable, and the soil
pressed down. This method is believed to be the one best suited
to the greatest variety of sites.
The amount of seed used per acre will, of course, vary with the
species and the method used, and the quality of the seed. The following
table indicates the approximate quantity of seed of good average
quality required per acre for three different methods, the average
cost when collected in fairly large quantities, and the number
of seed per pound:
| |
No. pounds required per acre. |
| Species. |
No. seed per lb. |
Cost per pound. |
Broadcast, entire area. |
Strips. |
Seedspots 6' apart. |
| Douglas fir |
42,000 |
$1.50 |
2–3 |
½–1 |
½–¾ |
| Yellow pine |
8,000 |
.50 |
10–12 |
2–2½ |
1½–2 |
| Western white pine |
14,000 |
.75 |
6–8
| 1½–1¾
| 1–1½ |
The total cost, too, will vary widely, not only because of the
different quantities of seed used but also because of the great extent
to which the methods are varied to suit the conditions occurring upon
the area. Simple broadcasting without any preparation or treatment
of the soil will not exceed 20 cents to 25 cents per acre for labor;
harrowing and sowing in strips, 85 cents to $1.10 per acre, and
sowing in seedspots, $2.00 to $5.00 per acre. Upon this basis the
total cost per acre will approximate the figures given in the table
below:
| Species. |
Broadcast over entire area. |
Strips. |
Seedspots, 6' apart. |
| Douglas fir |
$3.20–4.75 |
$1.00–2.60 |
$2.75–6.00 |
| Yellow pine |
5.20–6.25 |
1.85–2.35 |
2.75–6.00 |
| Western white pine |
4.70–6.25 |
2.00–2.40 |
2.75–6.00 |
Of all factors in calculating the financial possibilities of second
forest crops, the growth to be expected is the easiest to determine
with fair accuracy. Future stumpage value, tax burden and fire
risk are all subject to uncertain influences, but the approximate
yield of a given species under given natural conditions will be
the same in the future that it is now. To predict it requires only
study of existing stands without being misled by the influence
of conditions which will not be repeated.
On the other hand, an immense amount of misinformation is circulated
because of superficial observation. Enthusiasts discovering individual
trees which have made prodigious growth, or even fairly extensive
stands on fertile soil with heavy rainfall, will compute sawlog
yields at 40 or 50 years which are much too optimistic for general
application. Others, remembering some stand they have seen in
unfavorable localities, or noting shade-suppressed trees which
will not be paralleled after the virgin forest is removed, are
unduly discouraged. It is most essential that yield tables be made
by trained observers who know how to reach the true average, and
that the figures either actually come from the region to which they
are to be applied or are accompanied by a systematic analysis of
climatic and other conditions which permits intelligent comparison.
In calculating another yield on cut-over land, the system for an
even-aged new growth, such as will follow clean cutting of Douglas
fir, for example, is quite different from that necessary if the
cutting amounts only to selection of the merchantable trees and
leaves a fair stand of smaller ones. In the latter case, yield
tables based on average acreage production are of little use because
so much depends upon the character of the stand which remains on
the tract in question. Here the basis must be the rate of growth
of the average individual tree. An estimate by the number in each
present diameter class may be made of the trees which will escape
logging, showing, let us say for example, about five trees of each
diameter from 6 to 12 inches, or thirty-five in all which are over
6 inches. If the growth study indicates that in 20 years there will
have been added 6 inches in diameter we can estimate a crop of
five trees each of classes extending from 12 to 18 inches. Actually
the process will not be so simple, for the different aged trees
will not grow with equal rapidity, and several other factors must
be reckoned with, but the general principle is to apply rate of
growth knowledge to the material on hand, and study of this material
is essential.
For predicting even-aged crops resulting from entire restocking,
the acquisition of necessary basic information is as difficult, or
more so, but its application is far simpler. That the ground will
be fully stocked by natural or artificial means must be assumed,
but we can also assume that the result will be influenced only by
normal locality conditions and not by accidental condition of the
present forest. Therefore we use a yield table and not a growth
table. This can be made by actual measurement of existing second
growth stands of different ages, which proves not only the growth
rate but also the number of trees which the natural shade-thinning
process results in at different periods of the forest life. The
chief danger of inaccuracy in such information lies in basing it on
insufficient measurements or in applying it where soil or moisture
conditions are greatly different. The latter error can be guarded
against, however, by use of growth figures taken in conjunction
with it. For example, if a yield table showing 25,000 feet to the
acre at 50 years from seed is accompanied by one showing that the
average stand it represents is 125 high at 50 years and its average
50-year-tree is 14 inches in diameter, little investigation is
necessary to determine whether in any given locality the growth
falls far above or below that.
An attempt to reproduce here any considerable number of growth
and yield tables would be of doubtful use without more space than
is allowed to explain how they are made and used. There are many
technicalities, both mathematical and silvicultural, and unfortunately
most of the available figures for the Northwest, obtained by the
Forest Service, have not been generalized enough for wide popular
value. This is particularly true of yield tables which necessarily
require assuming standards of merchantability. While the best western
white pine table assumes that by the time a new crop is cut 7-inch
white pine will be salable, the best fir table was worked upon
a 12-inch diameter basis. Obviously this would show an unfairly
greater yield of a pine forest containing trees between 7 and 12
inches and be very misleading in calculating financial results at
the same age and stumpage rates; yet without the original data
there is no way of reducing both tables to the same basis. As an
example, however, to indicate how the financial possibilities of
second growth can be arrived at if a systematic study is made,
let us take the Douglas fir figures referred to.
These are exceedingly reliable. Measurements were taken by the Forest
Service of practically pure fir on about 400 areas in thirty-five
different age stands from 10 to 140 years old, ranging along the
western Cascade foothills from the Canadian line to central Oregon.
Since reforestation investment is likely to be confined mainly to
the more promising opportunities, only such growth was measured
as gave an average representation of the better class of the two
should all the general territory covered be graded in two quality
classes of all around ability to produce forests. On the other
hand, care was taken not to represent the maximum of the better
class, data being taken only from permanent forest land and not
from rich potential agricultural land which might show unfairly
rapid forest growth. The average areas were actually measured and
the number, age, form, diameter growth, height growth, board foot
contents, etc., of all the trees on them were accurately determined.
Trees 12 inches in diameter 4-1/2 feet from the ground were considered
merchantable, and it was assumed they could be used to 8 inches in
the top. From this data were prepared tables and diagrams showing
the average development of trees and stands under fairly favorable
conditions in the region west of the Cascades.
This gave the following yield per acre:
| Age of Stand. |
Feet, B. M. |
Age of Stand. |
Feet, B. M. |
| 40 |
12,400 |
90 |
70,200 |
| 50 |
28,000 |
100 |
79,800 |
| 60 |
41,000 |
110 |
90,300 |
| 70 |
51,700 |
120 |
101,500 |
| 80 |
61,100 |
130 |
113,000 |
Let us see how these figures can be used in answering the primary
question of the prospective timber-grower: "Will it pay to hold
my cut-over land for a second crop?"
Obviously no certain answer can be printed here, not only because
no uniform stumpage prices or carrying charges can be predicted but
also because individuals may differ as to what profit is necessary
to make the investment "pay," so it will be necessary to analyze
the situation so each may select the premises which suit his own
case and judgment. The investment made by the holder of cut-over
land is of two kinds; that represented by the land which otherwise
he might sell, putting the proceeds at work in some other business,
and the annual carrying charges which otherwise he might also invest
differently. The sum obtainable by investing the money available
by sale after logging, adding to it yearly the sum required for
fire prevention and taxes, and compounding both at a satisfactory
interest for the entire period, is practically the cost of holding
the tract for any given number of years. By calculating this cost
upon a basis of one acre, and dividing it by the yield board measure
which the same period will produce, the cost per thousand feet of
growing a second crop is arrived at.
Against this may be set the gross return from the same expected
yield at any given stumpage rate. The yield at the end of a 50-year
investment will not be that of a 50-year forest, however, for although
the carrying cost begins at once, the new forest requires a few
years to become established. No exact figure can be set for this,
for some seed will sprout the first year and some blank spaces may
persist several years, but in the tables to follow five years has
been allowed for an average. Consequently, instead of calculating
on a 28 M yield as the return at the end of 50 years, as indicated
in the yield table on the preceding page, the 45-year yield of
20-1/2 M is used, and similarly for the other periods of 60, 70
and 80 years. These four rotations only will be considered here,
for in less than 50 years second growth will probably be too small
to be cut at the highest profit, while after 80 years the investment
compounds so heavily as to make it improbable that increasing stumpage
values will compensate.
Three interest rates have been used in the first table to follow:
4, 5 and 6 per cent, compound. Forest calculations at lower rates
are often seen, but it is not believed that less than 5 per cent
will be satisfactory to private owners and many will insist on 6
per cent. The fair standard is what the owner can make in other
business today, and since he can reinvest his income in the same
business, it is reasonable to figure at a compound rate. A few
examples are given to show how similar calculations may be made
with any set of investment and stumpage factors which appeal to
individual judgment. The second table, prepared from the first,
shows at a glance the price that must be received for Douglas fir
to make it pay either 5 or 6 per cent compound interest under a
range of sixty different conditions of original investment and
annual cost.
It should be borne in mind that, although present land value is
made a charge, the value of the land at the time of harvest is
not considered. This value is certain to increase greatly in the
long periods involved. Taxation charges will be against it as well
as against the timber. Indeed much land is now held without any
regard to possible second growth. It should be assumed therefore
that any profit in forest investment shown will be increased
by the sum obtainable for the land at the end of the same period.
| |
|
Cost per M of growing
Douglas fir resulting from
every $1 per acre
originally invested. |
|
Cost per M of growing
Douglas fir resulting from
every 1 cent per acre
of annual carrying charge. |
| |
|
At the end of |
|
At the end of |
| |
|
50 Years. |
60 Years. |
70 Years. |
80 Years. |
|
50 Years. |
60 Years. |
70 Years. |
80 Years. |
| At 4% |
|
$ .35 |
$ .30 |
$ .33 |
$ .41 |
|
$ .074 |
$ .068 |
$ .078 |
$ .098 |
| At 5% |
|
.56 |
.53 |
.65 |
.88 |
|
.102 |
.101 |
.126 |
.172 |
| At 6% |
|
.90 |
.94 |
1.27 |
1.87 |
|
.142 |
.152 |
.208 |
.309 |
Example 1: With land worth $2.50 an acre at present, and an estimated
carrying charge of 3 cents a year for protection and 20 cents per
taxes, what stumpage price for a 50-year crop will pay 5 per cent
compound interest? 6 per cent?
| 5% |
|
6% |
| 2½ | × | .56 |
= | $1.40 |
|
2½ | × | .90 |
= | 2.25 |
| 23 | × | .102 |
= | 2.35 |
|
23 | × | .142 |
= | 3.27 |
| |
$3.75 |
|
|
$5.52 |
Example 2: With land worth $5 an acre at present, and stumpage
estimated to reach $7.00 in 60 years, what is the maximum annual
carrying charge per acre which can be paid during this period and
permit a 5 per cent return? A 6 per cent return?
| 5% |
|
|
6% |
|
| Gross return | = |
$7.00 | |
|
Gross return | = |
$7.00 | |
| 5 | × | .53 |
= | 2.65 |
|
|
5 | × | .94 |
= | 4.70 |
|
| |
$4.35 |
/ .101 = 43c |
|
|
$2.30 |
/ .152 = 15c |
Example 3: Assuming that stumpage will be worth $6.00 in 50 years,
and that public enlightenment will keep the annual fire and tax
charge from exceeding 20 cents, what price obtainable for cut-over
land today, made to earn 5 per cent compound interest in some other
business, is as profitable as keeping the land for a second crop?
If other business would earn 6 per cent?
| 5% |
|
|
6% |
|
| Gross return | = |
$6.00 | |
|
Gross return | = |
$6.00 | |
| 20 | × | .102 |
= | 2.04 |
|
|
20 | × | .142 |
= | 2.84 |
|
| |
$3.06 |
/ .56 = $7.07 |
|
|
$3.16 |
/ .90 = $3.51 |
FUTURE STUMPAGE PRICES NECESSARY TO MAKE DOUGLAS FIR SECOND CROP
PAY EITHER 5 OR 6% COMPOUND INTEREST ON INVESTMENT.
Maximum Original Investment $7.50 an Acre. Maximum Annual Carrying
Charge 30c an Acre.
| |
Cost per M Feet |
| |
Original Investment per acre. |
Taxes and protection paid yearly per acre. |
50 year rotation (20.5 M per A.) |
60 year rotation (35 M. per A.) |
70 year rotation (46.6 M per A.) |
80 year rotation (56.5 M per A.) |
| |
(cents) |
|
| 5% Compound Interest |
$2.50 |
10 |
$2.40 |
$2.35 |
$2.90 |
$3.90 |
| 15 |
2.95 |
2.85 |
3.50 |
4.80 |
| 20 |
3.45 |
3.35 |
4.15 |
5.65 |
| 25 |
3.95 |
3.85 |
4.75 |
6.50 |
| 30 |
4.45 |
4.35 |
5.40 |
7.35 |
| |
| 5.00 |
10 |
3.80 |
3.65 |
4.50 |
6.10 |
| 15 |
4.35 |
4.20 |
5.15 |
6.95 |
| 20 |
4.85 |
4.70 |
5.75 |
7.80 |
| 25 |
5.35 |
5.20 |
6.40 |
8.70 |
| 30 |
5.85 |
5.70 |
7.05 |
9.55 |
| |
| 7.50 |
10 |
5.20 |
5.00 |
6.15 |
8.30 |
| 15 |
5.75 |
5.50 |
6.75 |
9.20 |
| 20 |
6.25 |
6.00 |
7.40 |
10.05 |
| 25 |
6.75 |
6.50 |
8.00 |
10.00 |
| 30 |
7.25 |
7.00 |
8.65 |
11.75 |
| |
| 6% Compound Interest |
2.50 |
10 |
3.65 |
3.85 |
5.25 |
7.75 |
| 15 |
4.40 |
4.65 |
6.30 |
9.30 |
| 20 |
5.10 |
5.40 |
7.35 |
10.85 |
| 25 |
5.80 |
6.15 |
8.35 |
12.35 |
| 30 |
6.50 |
6.90 |
9.40 |
13.90 |
| |
| 5.00 |
10 |
5.90 |
6.20 |
8.45 |
12.45 |
| 15 |
6.65 |
7.80 |
9.45 |
14.00 |
| 20 |
7.35 |
7.75 |
10.50 |
15.50 |
| 25 |
8.05 |
8.50 |
11.55 |
17.05 |
| 30 |
8.75 |
9.25 |
12.60 |
18.60 |
| |
| 7.50 |
10 |
8.15 |
8.55 |
11.60 |
17.10 |
| 15 |
8.90 |
9.35 |
12.65 |
18.65 |
| 20 |
9.60 |
10.10 |
13.70 |
20.20 |
| 25 |
10.30 |
10.85 |
14.70 |
21.75 |
| 30 |
11.00 |
11.60 |
15.75 |
23.30 |
These tables bring out a number of very interesting primary facts:
1. The rate of interest demanded of the investment is one of the
most important factors. This is because such long terms are involved.
The charges compound with prodigious rapidity toward the last.
In any other business paying 6 per cent, compound, the maximum
investment per acre given in the preceding table, that of a land
value of $7.50 and a 30-cent annual charge for 80 years, would
earn $1,317. A 75-year forest then harvestable should have 56-1/2
M to the acre, but this would have to bring over $25 per M to pay
as well. On the other hand, the same deposits earning 4 per cent
would only amount to $338 in the same period which would be equaled
by timber at $6 per M.
2. For similar reasons, the length of time before cutting has much
to do with profit or loss. The compounding of carrying charges
eventually outstrips the production of material to a degree which
can be offset only by the most rapid rise of stumpage values.
3. The greater the investment, the more marked the above effect and
consequently the tendency to market an inferior product. A 60-year
rotation is indicated by a majority of the conditions shown.
4. A comparatively slight increase in annual tax or fire charges
may make the difference between profit and loss. Roughly, stumpage
must bring $1 per M more to compensate for each 10 cents an acre
for taxes at 5 per cent or for 7 cents at 6 per cent.
5. If the land is salable for $5 an acre or more it cannot be made to
pay 6 per cent compound interest under the most favorable conditions,
unless the stumpage received exceeds $6. At $5 stumpage and with
reasonable taxation it will pay 5 per cent if it escapes fire.
6. Thirty cents an acre is apparently about the maximum annual
carrying charge which will permit a 6 per cent profit, even with
very high stumpage prices. Consequently, while present taxes on
cut-over land are seldom prohibitive, there must be reasonable
certainty that excessive increase will not occur.
The carrying charges shown in the second table cover both fire
protection and taxes, as by reading the 15-cent line to include a
10-cent tax and a 5-cent fire patrol. The investment charge may be
used to represent sale value only, or sale value plus any expense
incurred at time of logging in order to secure reproduction, such as
leaving salable material in seed trees, or planting. If desired, any
owner may make a similar calculation on any other valuation better
fitting his own situation. The table is not intended for universal
use but merely as an illustration of how forest calculations may
be made.
Too much space would be required to give a similar table for all
western species, even were as good yield figures available. Roughly
speaking, however, western white pine, under conditions thoroughly
favorable to it, may be expected to make as good a yield as Douglas
fir, and the above fir table will not be far off for it. A probably
higher stumpage value should offset any lesser production.
Western hemlock is of somewhat, but not much, slower growth when
coming in on open land as an even-aged stand. No yield table based
on the same merchantable standards as the fir table quoted has
been prepared, but the following is fairly safe to include all
trees 14 inches in diameter used to 12 inches in the top: At 50
years, 2 M per acre; at 60 years, 22 M; at 70 years, 33 M; at 80
years, 40 M. The absence of a 40-year figure, and the sudden jump
between 50 and 60 years, is because very few hemlock trees reach 14
inches at 50 years, but a large number of 12 and 13-inch trees pass
into that class during the ten years following. Any yield figures
for an even-aged forest show a similar jump at the point where the
stand as a whole reaches the determined minimum merchantable size.
For the same reason these hemlock figures are not very far less
promising than those given for fir, for at corresponding ages the
latter include 12 and 13-inch trees and all trees are considered
merchantable to a top diameter of 8 inches.
Since no systematic study of Sitka spruce second growth has been
made, it can only be predicted from knowledge of its habits that
while in favorable situation it will yield as heavily as Douglas
fir, in other localities its growth in early life is slower and
less regular, making it less likely to produce a good crop before
the carrying charges become burdensome. If this proves true, taxation
rates and land values will be extremely important factors, offset
to some degree by a smaller fire hazard and the probability of
high stumpage.
For redwood we also lack good figures for any considerable range of
conditions and ages, for redwood growth which followed burns does
not exist and there are no very old cuttings. Government studies
on the northern California coast prove conclusively, however, that
this is our most rapid growing native commercial tree. In thirty
years, in fair soil, it will produce a tree of 16 inches diameter,
80 feet high, and some existing 45-year stands run 20 to 30 inches
on the stump and about 100 feet high. Reckoning 14-inch trees as
merchantable, to be used to 10 inches in the tops, a 25 to 30-year
second growth after logging near Crescent City was found to have
2-1/2 M feet to the acre and the future increase should be very
rapid. There is little question of the profit of growing redwood,
provided the difficulties described elsewhere of getting a dense
crop started are overcome.
In addition to the yield of saw timber to be expected when the
second crop reaches manufacturing size, there will be a market
in many cases for material obtained by thinning. It is perfectly
fair to compound for the remainder of the rotation any net profit
so obtained and to set it against the carrying charges. In many
cases it will go far to turn an apparently losing investment into
a very profitable one. Moreover, the proper thinning of growing
stands not only utilizes material which would otherwise die and
be lost before the main harvest, but actually improves the quality
of the first yield.
In obtaining the figures previously quoted the Forest Service found
that the average Douglas fir stand at 40 years contains 410 living
trees, most of them between 6 and 15 inches in diameter. At 60
years there are but 265 trees, 145 having died and decayed in the
20-year interval which were suitable for ties or other small timber
products. The remaining trees would have been improved by thinning
to prevent this loss, for the greatest diameter growth is made
when the stand is open, and the ideal is to have just the density
which will get the greatest wood production and still result in
proper pruning and clearing of the trees.
Commenting along this line Mr. T. T. Munger, who conducted the
investigation, says:
"That thinnings are silviculturally practicable and financially
profitable in the Pacific Northwest has been demonstrated. In the
vicinity of Cottage Grove, Oregon, many fully stocked even-aged
Douglas fir stands now about 50 years old, most of them forming
a part of ranches. Many of these stands have been cut over in the
last 10 years and all the material then large enough for piling or
mine timber cut out. This removed about 20 per cent of the stand.
At the present time many of these same stands now contain much
material valuable for small piles, ties and mine timber, yet the
crown canopy is as dense and the trees as close and fine quality
as though no cutting had ever been done in the stand. In fact,
some of the 50-year old stands have already been cut over a second
time, and each time with decided profit to the owner and no damage
to the forest. From one 10-acre block of second growth now 50 years
old, situated 7 miles from the railroad, already 32,000 feet of
mining timber and about 100 50-foot piles have been taken out,
yet the stand is now in good condition, and in a few years more of
the smaller trees can be removed without infringing on the yield
of the final crop. The material from these thinnings was worth at
the railroad about $80 per acre."
Throughout the preceding pages on the financial promise of
timber-growing in the West, the attempt has been not to give conclusions
but to state certain known facts regarding tree growth and indicate
how these may be used in arriving at conclusions based largely
upon the conditions and judgment of the individual owner. In many
cases they will do little more than suggest further investigation
necessary. The Western Forestry & Conservation Association and,
doubtless, the District Foresters for the Forest Service, will be
glad to discuss such work and assist if possible.
There are, however, several conservative deductions to be made:
1. The Pacific coast states contain large areas having species
and climatic conditions peculiarly favorable for forest-growing
as a business. The rapidity and quantity of yield insure profit
under conditions which would be prohibitive elsewhere.
2. In many cases, perhaps in most, a second crop can be started
with little initial expense.
3. There is much land of no value for any other purpose.
4. Even if the owner does not care to hold his land long enough for
another crop, or if he is prevented from doing so at some future
time by excessive taxation or other prohibition, its disposal value
will be greater if it bears young forest growth than if it does
not.
5. Stumpage values are certain to advance greatly and their advance
will be governed largely by these factors:
a. Speculative influence necessarily accompanying the lessening
of the nation's and the world's timber supply.
b. The carrying charges of fire prevention and taxation imposed
by the community upon virgin timber, which, since they represent
an investment which must be recouped, will either be added in the
long run to the price of stumpage exactly in the measure of their
severity and so transferred to the consumer, or result in rapid
cutting and consequently raise the speculative value of that which
escapes cutting. (This the consumer will pay also.)
c. The quantity of new timber grown.
6. It is probable that future demand for timber will reimburse the
cost of growing it, be this cost high or low within reasonable
limits.
7. This does not mean, however, that the timberland owner will or
can generally engage in the business when the cost is excessive.
While he could probably make a good profit eventually, such an
investment is too heavy and prolonged to be inviting; besides there
is the possibility of entire loss by fire. He will naturally compare
it with other investments having less disadvantages. For example,
since conditions which discourage the growing of new competing
forests tend for this very reason to enhance the value of existing
forests, he might invest further in the latter instead, with equal
ultimate profit and with easier access to his money at any time.
8. Consequently the growing of timber is promising to the private
owner only when the investment can be borne easily. Since it has
three forms—land value, fire protection, and taxation—all
must be moderate or, if one or more is high, the rest must be low.
9. With the fire hazard great at present, and taxation so uncertain
as to require allowing for its being excessive, the initial investment
must be insignificant.
10. This confines it to land of low sale value and precludes much
expense to insure the second crop.
11. To secure the perpetuation of forests on the scale essential
to public welfare, the public must provide the private owner better
fire protection and an equitable taxation system. Or else it must
purchase sufficient cut-over land and engage in forestry itself,
bearing the cost and taking the risk.
12. Nevertheless there are several practical exceptions to the somewhat
unfavorable situation theoretically outlined above:
(a) Many owners are warranted in holding cut-over land for some
time, if not indefinitely, because of the upward trend of land
values generally. Unless clearly most useful for agriculture, such
land will be made more valuable by a growth of young timber. However
indefinite the profit of encouraging this growth and protecting it
from fire may be if the present sale value and taxes are computed
against such outlay, the two latter charges are being carried
anyway and are the most important ones. Merely that it cannot
be proved that they can be more than offset is no reason for not
trying to compensate as far as possible at slight further expense.
While this may not often permit any great effort to reforest, it
will usually warrant protection of the natural new growth that
will follow if given a chance.
(b) Many owners would prefer to have their milling business continue
indefinitely. If such have or can purchase virgin timber to carry
them 50 years or more they may do well to grow a log supply to
come into use at that time, even if they would not do so merely
as a stumpage investment.
(c) It is highly probable that history will repeat itself in the
United States, especially in the Pacific coast states where every
other condition is so favorable to making forestry a great benefit
to the community, and that fire and tax discouragements will be
removed as soon as the public realizes the situation. The owner
who anticipates this and gets his crop started first will be the
first to profit from it, and since it is the compounding toward the
latter end of the rotation which now appears serious, the chances
are that he will not have a heavy burden before relief of this
kind arrives.
(d) Every owner of virgin timber which he expects to hold uncut
for 10 years or more should consider reforestation of adjacent
cut-over land in the light of fire protection also. It is the
inflammable, sun-dried, brake-covered openings, yearly increasing
in extent, which constitute his greatest fire menace. The conversion
of these into green young growth, too dense for fern and salal and
destructible only by the hottest crown fires, is the best protection
he can give mature timber surrounded by them. Some additional expense
for a few years to accomplish this will usually be cheaper and safer
than the patrol otherwise required for an indefinite period.
(e) Advance in value of the land itself, realizable when the second
crop is cut, will in many cases be great enough to make an otherwise
unpromising reforestation investment profitable.
In the foregoing pages consideration has been given to the growing
of native coniferous species only. There is a field, however, yet
to be entered into by the timber grower in the Pacific Northwest,
which gives promise of good returns. This is the growing of eastern
hardwoods. As is well known, the supply of native hardwoods in
this region is deficient and those occurring are of poor quality.
The demand for staple hardwoods is constant, and at present can
be filled only through importation from the East. Moreover, the
manufacturing industry in the Pacific Northwest is as yet only in
its infancy, and as this industry becomes of greater importance
in the future, the demand for hardwood lumber is bound to increase.
This increase in demand, coupled with the rapidly diminishing supply
in the East, seems certain to create a condition under which it
will be profitable to grow hardwoods commercially.
That eastern species will thrive under forest conditions in this
region has not, of course, been demonstrated, but the great variety
of species planted successfully as shade trees in towns and cities, and
in many instances by settlers in the mountains and farming districts,
together with the marked success of various fruits introduced here,
would tend to indicate their adaptability to the climate. In many
respects the climate along the coast of Oregon and Washington is
similar to that found throughout the great hardwood region of the
Southern Appalachian mountains.
Of the many species occurring in the East, several appear
preëminently suited to experimentation because of their particular
value in the trade and rapid growth. Hickory is one of the most
valuable of eastern woods, and the supply remaining is probably
least of all the important species. It is largely used in the vehicle
industry, and because of the fact that the trade can use trees
of small size, and even prefers "second growth" hickory to the
more mature form, a crop can be grown within a comparatively short
time. Shagbark or pignut are probably the best species to plant.
Red oak is another species for which there is a large demand, and
while it does not equal the white oak in value, its more rapid
growth makes it a more desirable species to grow. The increasing
scarcity of white oak has brought about the substitution of red oak
for many purposes for which the more superior variety was formerly
used exclusively. Black walnut is a wood highly prized in furniture
manufacture, and this, coupled with its rapid growth, places it
among the first rank of hardwood trees. Chestnut, white ash, tulip,
poplar and black cherry are other species whose value for various
purposes suggests the possible advisability of their introduction.
Much that has been said in the chapter concerning the methods of
establishing coniferous woods applies equally well to hardwoods.
Those species, however, whose seeds are in the form of nuts, such
as hickories, black walnut, chestnuts, and oaks, are particularly
adapted to propagation by direct seeding. Other species, such as
ash, tulip, poplar, and black cherry, whose seeds are small, are
better grown for one year in nurseries before transplanting into the
field. Where plantations are started by planting the nuts directly
in the field, the cost will be moderate. The nuts can be obtained
in any quantity from eastern seed dealers, and their cost, together
with the labor of planting them, should not exceed $4 per acre. Where
the area planted is level and free from underbrush, preliminary
plowing and harrowing, while adding $1.50 to $2 to the cost per
acre, will add much to the success of the plantation. Cultivation
during the early years of the life of the trees will also result
in increased growth.