Forest physiography; physiography of the United States and principles of soils in relation to forestry . tate of things that isthought to be related largely to the breaking up of the protective grasscover by over-pasturage in the headwater regions. A grass cover hasalmost as great influence in checking run-off and favoring absorption > G. E. Condra, Geography of Nebraska, 1906, pp. 85-94. = Report upon Geographical and Geological Explorations and Surveys West of the loothMeridian (Wheeler Surveys), Geology, vol. 3, 1875, p. 606. 426 FOREST PHYSIOGRAPHY by the soil as a timber cover, and thi
Forest physiography; physiography of the United States and principles of soils in relation to forestry . tate of things that isthought to be related largely to the breaking up of the protective grasscover by over-pasturage in the headwater regions. A grass cover hasalmost as great influence in checking run-off and favoring absorption > G. E. Condra, Geography of Nebraska, 1906, pp. 85-94. = Report upon Geographical and Geological Explorations and Surveys West of the loothMeridian (Wheeler Surveys), Geology, vol. 3, 1875, p. 606. 426 FOREST PHYSIOGRAPHY by the soil as a timber cover, and this relation is of such importancethroughout the Great Plains region as to make it a point of greatinterest to the forester interested in general conservation, for the com-bination of grass-land and timber is thoroughly practical. In the middle courses of the Great Plains streams and on numeroustributaries in the mountains there is a protective timber covering. Ina similar way a timber growth is found on the borders of the escarp-ments, and its maintenance is a matter of the liveliest concern to every. V^ « ^1 N Ws /.? \ .^ \^ V 4^^ ?- ,\ -1- , ^ < . N^ ? ^ \ 3 \ 0 \ FiS- 157. — Vegetation of the Texas regions, i, Atlantic forest belt; 2, Rocky Mountain forest; 3, Chap-arral; 4, Black Prairie; 5, bolson desert flora; 6a, Grand Prairie; 6b. Great Plains; 7, transitional,with plains, prairie, and Atlantic flora; 8, coast prairies; XXX, yucca belts. (Hill, U. S. Geol. Surv.) one in any way related to the regime of the streams. The amount ofwashed soil running off in the floods that follow cloud-bursts in theGreat Plains is enormous, especially where trees are absent and thegrass covering thin; the maximum extent of grass and forest coverought therefore to be maintained. This is seen especially in the ligniticbelt of Texas, which is a rough broken country with sandy soils. Butfor the shortleaf and post-oak forests which cover them the soils wouldbe washed in quantities from the
Size: 2297px × 1088px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
