Our National Forests Part 7

Up to June 30, 1917, 127,156,610 acres of National Forest land have been examined and cla.s.sified. Such work as this, once and for all time, will settle the controversy now and then waged in Congress by certain Congressmen that the National Forests have large and valuable tracts of agricultural lands locked up within their boundaries and therefore should be abolished, or turned over to the States, or equally radical disposition made of them. Such Congressmen usually are working for some predatory private interests who want to secure the great wealth in the National Forests that is being wisely conserved for the people.

_The Consolidation of National Forest Lands._ There has also been a great need for consolidating the National Forest lands where these were interspersed with private or state lands. Congress has recognized this need and from time to time has granted authority to exchange lands with private owners or States where such an exchange would be advantageous to the Government through the resulting consolidation of holdings.

Thus by getting the government lands into a more compact body their administration and protection are materially facilitated in many ways.

Before any exchange is made it must be ascertained that the land which the Government is to receive has equal value with that relinquished, also that the land is chiefly valuable for the production of timber and the protection of stream flow. Recent additions to the Whitman National Forest in Oregon consisted of privately owned cut-over timberland rapidly reproducing to valuable timber trees. t.i.tle to this will be secured by exchange for government owned lands.

HOW YOUNG FORESTS ARE PLANTED TO REPLACE THOSE DESTROYED BY FIRE

_Reforestation and the Timber Supply._ More than 15,000,000 acres of National Forest lands which are capable of producing timber and valuable chiefly for that purpose have been denuded of their original tree growth. These lands are not adapted to agriculture and possess but a small value for grazing. In their present condition they are practically unproductive barrens.

It is probable that one-half of this area will reforest itself naturally through the reseeding of burns, and the encroachment of tree growth upon natural openings, parks, gra.s.s lands, and brush lands. This natural extension of the forest on such areas is progressing at the estimated rate of 150,000 acres annually. The remaining half of the denuded area, 7,500,000 acres, must be reforested by artificial means. This land is unquestionably adapted to growing timber and useful to the nation primarily for that purpose. Every year that it lies idle the country suffers a great financial loss, for such an immense area is capable of growing at least three-quarters of a billion feet of timber annually.

It was recently estimated that the timberlands on the National Forests are producing between five and six billion feet of lumber annually by growth. The complete restocking of the areas now denuded or spa.r.s.ely timbered will increase the annual production of wood at least 25 per cent., an item certainly worth considering.

_Reforestation and Water Supply._ Even more important than the value of the timber which is lost annually is the part which these large areas play in the conservation of water supply. Most of this area is on the watersheds of western streams and rivers and the fact that it is denuded is a dangerous menace to the equable flow of the rivers which drain those areas. The National Forests contain over 1,175 watersheds which supply many munic.i.p.alities, 324 water-power projects, and 1,266 irrigation projects, aside from many other outside power and irrigation projects which are fed by watersheds within the Forests. The cities of Salt Lake City, Utah; Denver and Colorado Springs, Colorado; Portland, Oregon, and Seattle, Was.h.i.+ngton, all derive their munic.i.p.al water supply from streams arising in the National Forests. The proposed water system for the city of San Francisco, California, is also to be taken from the National Forest streams. A few years ago planting was undertaken on the watershed of the Colorado Springs, Colorado, reservoir. This water supply is worth annually from $80,000 to $100,000. Besides this the 2,000 horsepower hydro-electric plants are valued at $40,000 and the 40,000 undeveloped horsepower are said to have an additional value of $400,000, making the total value of the watershed more than $500,000, with the probability that a greater water supply having a far greater value will be needed as the city grows.

[Ill.u.s.tration: Figure 19. Drying pine cones preparatory to extracting the seed. Near Plumas National Forest, California.]

[Ill.u.s.tration: Figure 20. Extracting tree seed from the cones. The dried cones are shaken around until the seeds drop out through the wire mesh which forms the sides of the machine.]

And there are many evidences that the people of the West have begun to realize that the National Forests are the key to the entire water-supply situation in the West no matter for what purpose the water is used. The public consideration now being given to flood control, the requests from many western cities for special measures to protect their munic.i.p.al water supply, the concern expressed by irrigation a.s.sociations in Colorado and elsewhere, lest even the regulated cutting on the National Forests may reduce stream flow, and the rapid rate at which unused reservoir and power sites in the Forests are being developed, all are evidences of the importance of Forests in protecting water supplies.

Reforestation is essential so that the National Forests can effectively discharge this function.

_Government Reforestation Policy._ The duty of the Forest Service to put the denuded areas which will not be reforested naturally into a condition of productivity admits of no further argument. But the problem is not so easily solved as it is made clear. Under the semi-arid conditions prevailing on many National Forests this work involves uncertainties and unsolved problems. On the National Forests artificial reforestation was an untried field when the Forest Service entered it.

The Government therefore had to develop its own practice in the face of a great variety of conditions, largely unfavorable. The situation still calls for intensive experiments to develop the best methods from the standpoint of both cost and results. More than that, it calls for a different set of methods for each forest region of the West which has its peculiar trees, climate, and soils. Then, lastly, when the proper methods have been demonstrated by experiment, the new methods can be applied on a large scale with a very good chance for success.

Therefore intensive experiments must come first. Business prudence requires the development of all methods in detail and reasonable certainty as to their results before large sums are expended upon field operations. In the least favorable regions like the semi-arid mesas of the Southwest, the work is restricted for the present to small, carefully conducted experiments, the result sought being reliable information upon how to proceed rather than the reforestation of many acres. In the most favorable regions, as the western slopes of the Rocky Mountains and the Cascade Ranges, the results already obtained have been so excellent, due to an unusual combination of good growing conditions, that operations upon a larger scale have been justified simultaneously with continued intensive investigations. As the work is extended into each new region or new National Forest, the most favorable sites are always chosen first. After the possibilities and limitations of each method have been ascertained by experience under the best conditions of each locality the work can either be intelligently extended or restricted. But the work is always conducted from the standpoint of the maximum return for each dollar expended.

In accordance with the policy outlined by the Forest Service watersheds used for munic.i.p.al supply or irrigation continue to receive first consideration. Large sums are not, however, being spent on such watersheds where any uncertainty as to the outcome exists; that is before successful methods have been perfected by experiment. In addition to watersheds, reforestation work is being conducted for the primary object of producing timber only where climatic conditions and other factors are extremely favorable. As far as possible these areas are being selected with reference to the low cost of the work, natural conditions which insure rapid tree growth, and urgent local need for additional timber supplies. These favorable conditions generally obtain in Was.h.i.+ngton, Oregon, Idaho, Montana, Minnesota, and Michigan and it is in these States that the best results have been obtained. In California, Utah, Nevada, Colorado, and the Southwest the work is restricted to intensive experiments on a small scale, until successful methods of meeting the adverse local conditions have been perfected.

[Ill.u.s.tration: Figure 21. Preparing the ground with a spring-tooth harrow for the broadcast sowing of tree seeds. Battlement National Forest, Colorado. This view was taken at approximately 10,000 feet elevation. Photo by the author.]

[Ill.u.s.tration: Figure 22. A local settler delivering a load of Lodgepole pine cones at the seed extractors, for which he receives 45 cents per bushel. Forest officers receiving them. Arapaho National Forest, Colorado.]

_Methods of Reforestation._ Two general methods of reforestation have been developed. The first is called the direct seeding method, in which tree seed is sown upon the ground with or without simple forms of cultivation. The other method is the planting method by which seedlings are grown in nurseries under ideal conditions of soil, light, and moisture until they are large enough to be transplanted and stand the rigors of the open field. Direct seeding, where successful, is the cheaper method, but is necessarily limited to sites whose soil and moisture conditions are exceptionally favorable to tree growth. The inability of the newly germinated seedling to establish itself except in comparatively moist soil makes the success of this method on the semi-arid mesas of the Southwest, for example, very problematical, especially since these localities are subject to long dry seasons. In such localities the use of the direct seeding method must be restricted to experiments designed to determine the exact range of conditions under which it is feasible. The main effort, however, of the Forest Service has been given to direct seeding on areas where reasonable success appears to be a.s.sured. The planting of 2 or 3 year old seedlings or transplants largely overcomes the adverse soil and moisture factors which appear to have made direct seeding unsuccessful in many localities. This method, which is the general practice in European forestry, must without doubt be employed to reforest a considerable portion of the denuded lands. The growing and planting of nursery stock is carried on simultaneously with direct seeding. The object of this is to ascertain the comparative results of the two methods, the sites on which the greater success will be obtained from each, and the proper relation of the two methods in the future development of reforestation work.

Since reforestation work was begun on the National Forests about 135,500 acres have been sowed or planted. The larger part of this acreage was reforested by direct seeding. Until only a few years ago larger areas were direct seeded each year than were planted to nursery stock, but at the present time more planting is being done. During the fiscal year 1916 about 7,600 acres were planted and about 2,800 acres were seeded.

The average cost in that year of planting was about $10.00 per acre, that of the seeding was about $4.50 per acre. The 1917 costs were slightly higher, due to the increased cost of labor and supplies.

The reforesting methods of the Forest Service mean the collection of large quant.i.ties of seeds and the growing of large quant.i.ties of small trees for planting. Since 1911 the Forest Service has collected over 175,000 pounds of seeds for its direct seeding and planting work. During the fiscal year 1916 the Forest Service had 14 large tree-nurseries and 7 small ones, which had in them over 37 million young trees which would, in a short time, be planted in the field. From these figures it is readily seen that the reforestation work on the National Forests is conducted on a large scale.

_Direct Seeding Work on the National Forests._ The direct seeding work on the National Forests involves many more problems than one would at first thought suppose. Seed must be collected and extracted; it must be stored, if it is not used immediately; if the seed is sown it must be protected from rodents and very often the ground must be prepared before the seed is sown.

[Ill.u.s.tration: Figure 23. In the forest nursery a trough is often used for sowing seed in drills. The seed scattered along the sides of the trough rattles into position at the bottom and is more even than when distributed by the ordinary worker at the bottom of the trough. Pike National Forest, Colorado.]

[Ill.u.s.tration: Figure 24. Uncle Sam grows the little trees by the millions. These will soon cover some of the bare hillsides on the National Forests of the West.]

Seeds are collected in various ways. Often cones are purchased at advertised rates from persons who make a business of seed collecting.

The collectors deliver the cones to a specified Ranger station or to some seed extracting plant. But such collectors are not always available. Seed is collected by Forest officers by stripping cones directly from standing trees or from those felled in logging operations.

Large quant.i.ties are also gathered from the vast stores or caches a.s.sembled by squirrels.

Seed extraction is usually done most economically by experienced Forest officers. It requires drying by exposure to natural or artificial heat to open the cones; thres.h.i.+ng to separate the seed from the scales and woody portions of the cone; and cleaning or fanning to remove chaff and dirt. Much of the extraction has. .h.i.therto been done in small quant.i.ties at a large number of stations and with very simple home-made appliances.

In view of the large amount of seed which must be handled each year the cost of extraction has been materially reduced and seed of higher average fertility has been obtained by concentrating the major part of the work at central seed-extracting plants equipped with improved machinery.

A problem of great importance from the standpoint of final results is that of having seed available at the season of the year when it is needed. Past experiments have shown that fall sowing is essential to success in most parts of the West where extensive seeding projects will be conducted. Experience has also shown that seed on a large scale cannot be extracted in time for use in the same season. Moreover, every year is not a good seed year, so that Forest officers must take advantage of the good years to collect large quant.i.ties and store them for use during years of seed shortage. Purchased domestic or foreign seed cannot be used to advantage to make up these deficiencies because it is sometimes of poor quality and not adapted to the climatic conditions in which it must be sown. For these reasons methods had to be devised for storing large quant.i.ties of seeds for several years at a time and in such a manner that their vitality would not be impaired.

Many storage tests have been made by the Forest Service to determine the best way of storing seeds. The tests showed that the sealed gla.s.s jar is the best container and that seed must be stored either in air-tight receptacles or at low temperatures to be kept for any considerable period without loss of fertility.

Probably the greatest obstacle encountered in reforestation by direct seeding is the destruction of the seeds by rodents. The failure of many direct seeding projects has been due primarily to loss from this cause.

Failure has occurred on areas of practically every character regardless of the time of the year the seed was sown. Success has been encountered only where recent burns had largely eliminated the animals either by outright destruction or by the loss of food supply. The rodents which are most destructive to tree seeds are the ground squirrels, the chipmunks, the mice, and the gophers. It is not strange that they should seek out the seed that has been carefully sown by the Forest officers. In many cases these seeds are their natural food and they are wonderfully diligent and expert in searching it out.

In cooperation with the Biological Survey, the Forest Service has worked on the problem of destroying the rodents. Many methods have been tried out in the field. The free use of grain poisoned with strychnine has thus far produced the best results and has reduced the loss from rodents sufficiently to secure satisfactory germination. The successful elimination of such injury appears to lie in the thorough poisoning by this method of areas to be seeded, once or oftener in advance of sowing.

With successful germination a.s.sured by the collection of good seed and the protection of it after it has been sowed from rodents, the next problem lies in cheap methods of cultivation and sowing. This will enable the young seedling to develop its root system early enough and rapidly enough to withstand the first annual drought, the dominant feature of the climate of all the western National Forests.

[Ill.u.s.tration: Figure 25. One of the large Forest Service nurseries where the young trees are given the utmost care before they are large and strong enough to endure the rigorous climate of the National Forests. McCloud Nursery, Shasta National Forest, California.]

There are numerous methods used in sowing tree seed on the National Forests. Three general methods are used in most of the work. Broadcast sowing is practiced in the fall and spring or upon the snow in the winter, both on ground that has not been prepared and on soil that has been scarified by rough brush drags, harrowing, disking, or partial or complete plowing. In seed-spot sowing the seed is planted at regular intervals in small spots where the soil is cleared of vegetation and worked up loose to a depth of from 5 to 6 inches. When corn planting or dibbling is practiced the seed is thrust into the soil by a hand corn-planter, or, in the case of large nuts, pressed into holes made with a pointed stick. The corn-planter method is often combined with the preparation of seed spots or the plowing of single furrows, in order to plant the seed in loose soil free from vegetation.

On a large majority of the Forests broadcast seeding on unprepared ground has not succeeded. As a rule satisfactory stands have been secured from broadcasting only after an expensive preliminary cultivation which would be impracticable in extended operations and which would exceed the cost of planting with nursery stock. But broadcasting on prepared strips and upon recent burns has given some success. The seed-spot method has been most successful if done at the proper season. Late summer and early fall sowing has produced better results than sowing in spring or winter. As a whole direct seeding has not succeeded, especially when the results and costs of the work are compared with the planting of nursery stock. Planting has thus far yielded better results, especially on the less favorable areas.

Furthermore, from the standpoint of final results attained, planting has actually been cheaper than seeding, in spite of the greater initial cost of planting. While the major emphasis in reforestation work is placed upon planting, considerable seeding is being done, but it is confined to the most favorable localities and sites.

_Planting on the National Forests._ Reforestation by planting young trees has received much attention during the last few years princ.i.p.ally because it has produced better results. Much still remains to be said for both methods and future experiments alone can decide which method to use in a specified region and under given conditions of climate and soil. Usually direct seeding has been tried first in any given locality where reforestation work was to be done. In fact the policy of the Forest Service in artificial reforestation on the National Forests has been, first, to conduct experiments to find out what can be done and what is the best way to do it; second, to reforest by direct seeding wherever this is feasible; and third, to plant nursery seedlings where direct seeding has been found too uncertain.

[Ill.u.s.tration: Figure 26. A view of seed sowing with a corn planter. San Isabel National Forest, Colorado]

[Ill.u.s.tration: Figure 27. Sowing seed along contour lines on the slopes.

Pike National Forest, Colorado]

In selecting areas for planting, preference is usually given to the watersheds of streams important for irrigation and munic.i.p.al water supply and to land which is capable of producing heavy stands of a quick-growing species or of a specially valuable species. Next in importance are areas which offer good opportunities for object lessons to the public in the practice of forestry. Some areas offer combinations of advantages. For instance, a burned-over tract may be suitable for planting to some rapid-growing species which is also valuable for timber and at the same time may be situated so that it will serve as an object lesson also. It is on such areas in general that reforestation by planting is being concentrated.

While the reforestation of the watersheds of streams important for irrigation and munic.i.p.al water supply has a large financial value, this value is hard to estimate because it involves not actual cash profit but loss prevented. But when a favorable site is planted to a quick-growing, valuable, species, it is comparatively easy to arrive at a fair estimate of the possible profit on money invested. It has been estimated that under many conditions it is highly profitable to reforest waste lands on the National Forests by planting. From certain experiments made it is estimated that a white pine forest artificially established on a second-cla.s.s forest soil in Minnesota, will yield about 46,500 board feet per acre in 50 years, worth at least $10 per thousand feet, or $465 per acre. Figuring the cost of planting and the cost of care and protection per acre per year at 3 per cent. compound interest gives a total cost of $34.07 per acre at the time the timber is cut and a net profit of $8.62 per acre per year. Douglas fir in the Northwest will produce 81,000 board feet in 80 years, worth at least $8.50 per thousand feet. After deducting all expenses this would leave a net profit of $555.30 in 80 years or about $6.94 per acre per year. These profits are indeed large, considering that the land is not capable of producing cereal or vegetable crops profitably. And it must be remembered that in all the above calculations all the money invested is earning 3 per cent.

compound interest and that the net profits are the earnings in excess of this 3 per cent. interest.

The little trees that are set out on the National Forests every year are produced in large nurseries, where they are grown by the millions.

In these nurseries the little trees receive the most expert care from the time the seeds germinate until the time they are large enough to withstand the rigors of wind and weather on the barren hillsides of Uncle Sam's Forests. The seeds are first carefully sown in seed beds and left to develop in these from one to three years. At the end of one year they may be transplanted in nursery rows where they will have more room to develop. Rapidly growing species like yellow pine are kept only a year in the seed bed and perhaps one or two years in the transplant beds; but slow growing species, like cedar, must remain in the seed beds two years and usually two years in the transplant beds. All this depends upon the species and the site upon which it is to be planted.

If my reader were to visit the Pikes Peak region during spring or fall he would doubtless encounter large gangs of men planting young trees on the barren mountain slopes. Under the proper supervision of Forest officers some of the men will be seen digging holes with a mattock while others are coming directly behind them with bags or boxes with wet moss or burlap, containing small trees. These men are called respectively the diggers and planters. Two men will plant from 500 to 1,000 trees a day, depending upon how deep the holes must be dug to accommodate the roots, whether the ground is bare or covered with sod, whether the land is mountainous or level, and many other factors.

In this way Uncle Sam plants his denuded areas in the Forests, so that they will be producing _timber_ for future generations instead of useless _brush_ or _tree weeds_. The great variety of climatic and topographic conditions included in the National Forest area makes the problem of tree planting infinitely complex. Nursery stock must be raised in each region having similar climatic conditions, and in each of these regions different methods of planting must be used, depending upon local conditions. The semi-arid mesas of Arizona and New Mexico present different planting problems from the humid forest regions of Oregon and Was.h.i.+ngton; the methods used in the sandhills of Nebraska and the sand plains of Michigan cannot be applied in full on the high mountain slopes of Colorado; nor are the planting problems in the vast chaparral areas of northern California anything like those encountered in the mountains of Idaho, or in the prairie States of the Middle West, or in the Black Hills. Then, again, the reforestation problems of the chaparral fields of southern California are more perplexing than any I have mentioned above.

[Ill.u.s.tration: Figure 28. A planting crew at work setting out small trees. The man ahead digs the hole, and the man behind plants the tree.

Wasatch National Forest, Utah]

THE ORGANIZATION AND SCOPE OF FOREST EXPERIMENTS AND INVESTIGATIONS

_The Need of Scientific Experiments._ No science can make progress without intensive experiments and investigations, least of all a new science like forestry. The science of forestry as it has developed in Europe is several hundred years old, but the science of forestry as applied to American conditions is still in the infancy of its development--probably not over 20 years old. Therefore we know very little about our trees, our forests, and the wood which they produce, and the professional foresters who handle the scientific work on our National Forests are very much handicapped. To supply the needed information about the requirements of many of our tree species, the uses to which their wood can be put, and many other related subjects, the Forest Service has established 8 Forest Experiment Stations (recently reduced to 6) and one Forest Products Laboratory. It has become the business of these inst.i.tutions to study the laws governing the life of the tree and the forest and their effect upon the final product--wood.

The Experiment Stations are working on the solution of the many problems which confront the Forest officers in the management and the protection of the National Forests; while the Forest Products Laboratory was organized to promote the most profitable utilization and the most economical disposition of the forest products of the National Forests.

Both sets of inst.i.tutions, in doing this, are helping materially to build up the science of American Forestry, which even to-day can hardly be said to exist.