Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 144. — North end of San Mateo Mountains, Trans-Pecos Highlands \l« NUmlo. Shows char-acteristic tree-covered slopes. Mountains composed of rhyolite flows and tuffs. (Gordon, U. Surv.) situations they become increasingly more exuberant in growth. Uponthe slopes and summits of the highest mountains, the Chisos, Davis,Capitan, and Sacramento ranges, a thrifty tree growth of pine and firis found; upon the lower mountains the tree growth becomes morescattered and upon the lowest ran
Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 144. — North end of San Mateo Mountains, Trans-Pecos Highlands \l« NUmlo. Shows char-acteristic tree-covered slopes. Mountains composed of rhyolite flows and tuffs. (Gordon, U. Surv.) situations they become increasingly more exuberant in growth. Uponthe slopes and summits of the highest mountains, the Chisos, Davis,Capitan, and Sacramento ranges, a thrifty tree growth of pine and firis found; upon the lower mountains the tree growth becomes morescattered and upon the lowest ranges no true forests appear. TheBlack range bears a good growth of pine upon its upper slopes; theMagdalena range and San Mateo Mountains have poorer growths of 1 G. B. Richardson, El Paso Folio U. S. Geol. Surv. No. 166, 1909, p. 115. 2 C. E. Dutton, 6th Ann. Rapt. U. S. Geol. Surv., 1885, p. 125. TRANS-^ECOS HIGHLANDS 403. Cuntour inlerval lOOO feet I T Timberless, Grazing EIZl Woodland ^ Less than 2000 feet 1 1 2000 to 5000 feet ?? 5000 to 25,000 feet 145A. — Timber belts, Capitan Mountains, New Mexico. Note (ij the manner in which the timberbelts follow the waterways, (2) the increase in growth with increase of elevation, and (3) the island-like outlines of the densest growths. (Adapted from U. S. Geol. Surv.) pine interspersed with cedar and juniper, though in the better-favoredsituations good stands are found.^ The ranges of the species of trees occurring in the Trans-Pecos regionvary as to rainfall, soil, and slope exposure. The lowest and best growthis found on the northern cooler and moister slopes and wherever the bestsoils have been developed. Except on the broader summits the soilhas little humus for the undergrowth is scattered and light, oxidationof decaying vegetation is rapid and fairly complete, and erosion is ingeneral active. There is a notable banding of the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
