OUR VISIBLE IMPACT ON THE PLANT LIFE
Though nature lovers usually find the life zones more fascinating than any other aspect of plants in the mountains, there is one other much more important. It is the misuse, injury, and destruction of native plant life. Because scientists are generally alert to the conservation of what is useful and beautiful in natural resources, I venture to bring up the matter here.
A useful case history is provided by Silver City, New Mexico. It was founded in the early seventies as a silver camp, which would fairly guarantee a certain amount of reckless haste and rowdy carelessness. Point two was its location on a foothill watershed only twenty-seven square miles in area. Point three was an extreme concentration of livestock near the town. Point four was the fact that the annual rainfall was crowded mainly into July, August, and a part of September.
Mines are naturally users of timber. Obviously, shafts and tunnels have to be timbered. More than that, little smelters nestled back among the hills were also hungry for wood. And since coal was expensive and hard to get, most of the adobe cottages were heated many years by juniper, oak, and piñon firewood. All these matters were naturally, if not actually, inevitable under the circumstances.
The massive ore wagons and freight wagons had to be drawn by four- to ten-horse teams—and the horses kept on eating. Then because it was also a ranching country, each cowboy had to keep a remuda of saddle horses—and they ate too. Also, the few cows that provided milk for the children grazed hungrily over the stony slopes. Most of all, the range cattle, which had no provender at all except that which the competitive, half-starved steers could provide for themselves, overgrazed every square foot of pasturage down to the bare soil. The government’s open-range policy made overgrazing inevitable because no ranchman could protect his pasturage since it was all unfenced. The cow that got there first got the grass. That passed as land management, which proves that some statesmen then were about as wise as some of the Wizards of Washington now. But the advent of fences caused the cutting of millions of fence posts where none should have been cut.
Elk
When the grass went, its roots went, and when its roots went, there was nothing to hold the soil, and then it, too, started to go. And go it did. A deep hole formed in Main Street, as it is still called on the Silver City town plat. The best explanation I can find of that hole is that earth was taken out of it to form adobe bricks for the walls of houses and corrals (that clay did make good adobe!). Meanwhile, the woodhaulers’ wagons had greedily carted away the trees from each little canyon, while the narrow steel tires cut deep ruts which formed two deep gullies at the first heavy rain. Then the parallel gullies proceeded to wash out deeper and create a middle ridge or high center on which axles got stuck. Since there was nobody responsible for making a new road, there was no choice except to move over and form another track and use it until in turn it became unusable. (By this simple kind of destruction, the old Santa Fe Trail, it is said, reached a width of a hundred feet.)
But the water descending the slope kept increasing its destructive velocity as the denuded ground approached the bareness of a tin roof. Villagers observed that the hole in their Main Street was becoming a waterfall after each rain, and that the ruin was passing into a big-time operation. The town built a dam to restrain the floods. It washed out in the first one. Soon Main Street followed it down the drain, which by this time was already a hideous gash in the earth many miles long and twenty feet deep. Then the water began on a really different scale of destruction. One furious flood washed away the cabin in which Billy the Kid’s mother lived. More than that, it washed away the wall of Judge Newcomb’s house and abducted his Steinway from the second floor. A few yards from the spot, an old photograph taken in 1891 shows a woodhauler’s ox team lying in the street there. It gives no hint at that time of the famous Big Ditch—the only name that Main Street, Silver City has had now for the last forty years.
By 1927, after many other attempts had been made to tame the floods a steel bridge about one hundred feet long and thirty feet above the floor of the “canyon” was swung into place. In 1935-1936, the Soil Conservation Service went to work in earnest, made the watershed a demonstration area, and spent a third of a million dollars there in a short time.