Part 9 (1/2)
Outside the National Parks and a few game preserves he is without refuge from the hunter throughout the year. It is not surprising that over the greater portion of his old territory he rarely is seen. He is, indeed, rapidly verging on extermination. The lion and the tiger are often rapacious, cruel, sneaking, bloodthirsty, and cowardly, and it may be better for other wild folk if they are exterminated; but the grizzly deserves a better fate. He is an animal of high type; and for strength, mentality, alertness, prowess, superiority, and sheer force of character he is the king of the wilderness. It is unfortunate that the Fates have conspired to end the reign of this royal monarch. How dull will be the forest primeval without the grizzly bear! Much of the spell of the wilderness will be gone.
Bringing Back the Forest
Bringing back the Forest
During the last fifty years repeated fires have swept through Western forests and destroyed vast quant.i.ties of timber. As a result of these fires, most species of trees in the West have lost large areas of their territory. There is one species of tree, however, that has, by the very means of these fires, enormously extended its holdings and gained much of the area lost by the others. This species is the lodge-pole pine.
My introduction to this intrepid tree took place in the mountains of Colorado. One day, while watching a forest fire, I paused in the midst of the new desolation to watch the behavior of the flames. Only a few hours before, the fire had stripped and killed the half-blackened trees around me. All the twigs were burned off the tree beneath which I stood, but the larger limbs remained; and to each of these a score or more of blackened cones stuck closely. Knowing but little of trees and being interested in the fire, I paid no attention to these cones until a number of thin, brownish bits, like insects' wings, came fluttering and eddying easily down from the treetop.
The ashes and the earth around me were still warm, and the air was misty with smoke. Near by, a tall snag and some fallen logs smoked and blazed by turns. Again, a number of these tissue bits came fluttering and whirling lightly down out of the fire-killed treetop. Watching carefully, I saw brown tissue bits, one after another, silently climb out of a blackened cone and make a merry one-winged flight for the earth. An examination of these brown bits showed that they were the fertile seeds of the lodge-pole pine. With heroic and inspiring pioneer spirit, this indomitable tree was sowing seeds, beginning the work of reconstruction while its fire-ruined empire still smoked.
It is the first tree to be up and doing after destructive flames sweep by. h.o.a.rded seeds by the million are often set free by fire, and most of these reach the earth within a few hours or a few days after the fiery whirlwind has pa.s.sed by. Being winged and exceedingly light, thousands are sometimes blown for miles. It would thus appear that the millions of lodge-pole seeds released by fire begin under most favorable conditions. Falling as they do, upon earth cleaned for their reception, there is little or no compet.i.tion and but few enemies. The fire has banished most of the injurious animals, consumed compet.i.tors and their seeds, and prepared an ashen, mineralized seed-bed; not a leaf shades it, and altogether it is an ideal place for the lodge-pole seed and seedlings.
It seems extraordinary that fire, the archenemy of the lodge-pole pine, should so largely contribute to the forest extension of this tree. It is not only one of the most inflammable of trees but it is easily killed by fire. Despite these weaknesses, such are the remarkable characteristics of this species that an increase in the number of forest fires in the West will enable this tree to extend its holdings; on the other hand, a complete cessation of fires would, in time, almost eliminate it from the forest!
The lodge-pole pine (_Pinus contorta_, var. _Murrayana_) lives an adventurous frontier life, and of the six hundred kinds of North American trees no other has so many pioneer characteristics. This species strikingly exhibits some of the necessary requisites in trees that extend or maintain the forest-frontier. The characteristics which so largely contribute to its success and enable it to succeed through the agency of fire are its seed-h.o.a.rding habit and the ability of its seedling to thrive best in recently fire-cleaned earth, in the full glare of the sun. Most coniferous seedlings cannot stand full sunlight, but must have either completely or partly shaded places for the first few years of their lives.
Trees grow from seed, sprouts, or cuttings. Hence, in order to grow or to bring back a forest, it is necessary to get seeds, sprouts, or cuttings upon the ground. The pitch pine of New Jersey and the redwood of California, whether felled by fire or by axe, will sprout from root or stump. So, too, will the aspen, chestnut, cherry, cottonwood, elm, most of the oaks, and many other kinds of trees. The extensive areas in New Brunswick and Maine that were cleared by the fires of 1825 were in large part at once regrown with aspen, most of which sprouted from the roots of burned aspens. Willow is easily propagated from a short section of the root, trunk, or limb. These sections may be broken from the tree by accident, be carried miles down-stream, lodge on sh.o.r.e or shoal, and there take root and grow. Beaver dams made of willow poles are commonly overgrown in a short time with willow. Several years ago a tornado wrecked hundreds of willows along a Kansas stream. Each willow was broken into scores of pieces, which were carried and dropped along the track of the tornado. Countless numbers of them were stuck into the earth. Several thousand willow trees were thus successfully planted by this violent wind.
Seeds are the chief means by which the forest is extended or produced.
They are sown by wind and gravity, by water, by birds and beasts. I have dwelt at length upon the romance of seed-scattering in ”The Spell of the Rockies,” in the chapter concerning ”The Fate of a Tree Seed.”
Each species of tree has its own way of scattering its seeds. Once upon the earth, they and the seedlings that may spring from them have peculiar limitations and special advantages. In some cases--as, for instance, with most willows and poplars--these seeds must in an extremely short time find a place and germinate or they perish; the seeds of few trees will stand exposure for two years and still be fertile.
It is only a question of a few years until seeds are carried to every treeless locality. They may journey down-stream or across lakes on a log, fly with birds across mountain-ranges, ride by easy stages clinging to the fur of animals, or be blown in storms across deserts; but these adventurous seeds may find gra.s.s in possession of the locality and so thickly sodded that for a century or longer they may try in vain to establish a forest.
Commonly wind-blown seeds are first upon the ground and the most numerous. Though it is of advantage to be the first upon the ground, it is of immense importance that the seed which falls in an opening produce a seedling which thrives in the sun-glare,--which grows without shade. The seedlings of our great oaks and most strong and long-lived trees cannot thrive unless s.h.i.+elded from the sun, sheltered from the wind, and protected from the sudden temperature-changes which so often afflict openings. While these maintain the forest areas, they extend it but little. Only a small number of trees have the peculiar frontier characteristics. Young trees which cannot live in the sun are called tolerant,--they tolerate shade and need it. Species which conquer sunny territory are called intolerant,--they cannot stand shade and need sunlight. It will thus be seen that the acquirement of treeless territory by any species of tree demands not only that the tree get its seeds upon the earth in that territory, but also that the seeds, once there, have the ability to survive in the sunlight and endure the sudden changes of the shelterless opening. Most species of oaks, elms, firs, and spruces require shade during their first few years, and though they steadfastly defend possessions, they can do but little toward winning new territory. On the other hand, aspens, willows, gray birch, cottonwood, old-field pine, and lodge-pole pine produce seedlings that glory in the sunlight and seek to gain more territory,--to push forward the forest-frontier.
Again and again the forest has been swept away by fire; but again and again a few aggressive species have retaken speedily the lost territory. In this pioneer reclamation the aspen and the lodge-pole are leaders. The aspen follows the water-courses, running along the muddy places, while the lodge-pole occupies the dry and rocky slope of the burned area. Seen from a distance the aspen groves suggest bright ribbons and pockets on the sombre cloak with which lodge-pole drapes the mountain. And even beneath the trees the contrast between the methods of these two agents of reforestation is marked. The lodge-pole pine is all for business. Its forest floor is swept clean and remains uncarpeted. The aspen groves, on the other hand, seem like the haunts of little women. Here the floor has a carpet of gra.s.s gay with columbines, sweet peas, and wild roses. While the aspens and the lodge-poles are still young they begin to shelter the less hardy coniferous seedlings. But sooner or later both the aspens and the lodge-poles themselves are smothered by their nurslings. They then surrender their areas to forest trees that will live to be many times their age.
But that species which is preeminently successful in bringing back the forest to a burned-over area is the lodge-pole pine. It produces seeds each year and commonly h.o.a.rds them for many years. Its seeds are light, winged, and easily carried by the wind. As they are frequently released by fire, they are sown at the most opportune time, scattered in profusion, and, in windy weather, transported long distances.
Commonly lodge-pole pine holds on to, or h.o.a.rds, a percentage of the seeds it bears; that is to say, these seeds remain in the cone, and the cone remains on the tree. In some situations it begins to bear at eight years of age, and in most localities by the time it is twelve.
Year after year the cones, with their fertile seeds safely enclosed, are borne and cling to the tree. Some of these cones remain unopened from three to nine years. A small percentage of them do not open and distribute their seeds until they have been on the tree from twelve to twenty years, and many of the cones cling to the tree through life.
Under favorable conditions the lodge-pole is a rapidly growing conifer. In a forty-five-year growth near my home, the varied light and soil conditions were so spotted that in a small area marked differences in growth were shown. A few cl.u.s.ters were vigorous, and the trees showed an average diameter of six inches and a height of thirty-four feet. From this the size dropped, and in one group the individuals were less than one inch in diameter and scarcely tall enough to be used as a cane; yet all were forty-five years old.
The lodge-pole is not long-lived. The oldest one I ever measured grew upon the slope of Long's Peak. It was three hundred and forty-six years of age, measured twenty-nine inches in diameter, and stood eighty-four feet high. A study of its annual rings showed that at the age of two hundred it was only eleven inches in diameter, with a height of sixty-nine feet. Evidently it had lived two centuries in an overcrowded district. The soil and moisture conditions were good, and apparently in its two hundred and second year a forest fire brought it advantages by sweeping away its crowding, r.e.t.a.r.ding compet.i.tors. Its annual ring two hundred and two bore a big fire-scar, and after this age it grew with a marked increase of rapidity over the rate of previous years. A mature lodge-pole of average size and age measures about eighteen inches in diameter and stands sixty feet high, with an age of between one hundred and twenty-five and one hundred and seventy-five years.
The clinging habit of the cones of the lodge-pole pine in rare cases causes numbers of them to be caught by the expanding tissues, held, and finally overgrown and completely buried up in the tree like a knot. Commonly the first crop of cones is the one caught. These are usually stuck a few inches apart in two vertical opposite rows along the slender trunk. Each k.n.o.b-like cone is held closely against the trunk by a short, strong stem.
I have a ten-foot plank from the heart of a large tree which shows twenty-eight imbedded cones. The biography of this tree, which its scroll of annual rings pictured in the abstract, is of interest. The imbedded cones grew upon the sapling before it was thirty years old and when it was less than twenty-five feet high. They appeared upon the slender trunk before it was an inch in diameter. Twenty-six annual wood-rings formed around them and covered them from sight as completely as the seeds the cone-scales clasped and concealed. The year of this completed covering, as the annual rings showed, was 1790.
Then the tree was sixty-six years of age; it came into existence in 1724, and apparently, from the forest-history of the place, in the pathway of a fire. This lodge-pole lived on through one hundred and eighty-two years. In the spring of 1906 a woodsman cut it down. A few weeks later two-inch planks were sliced from the log of this tree in a sawmill. The fourth cut split the pith of the tree, and the startled sawyer beheld a number of imbedded cones stuck along and around the pith, the heart of this aged pine. These cones and the numerous seeds which they contained were approximately one hundred and fifty years old. I planted two dozen of the seeds, and three of these were fertile and sprouted.
[Ill.u.s.tration: OVERGROWN CONES IN THE HEART OF A LODGE-POLE PINE (Showing also the cones as borne on the twigs and an early stage of the overgrowing process)]