Hydrology and Erosion
نویسنده
چکیده
Climate induced temporal variation, spatial patterns of vegetation and microenvironments, plant growth forms, soils and geology, and topographic factors influence hydrologicprocesses in rangelandenvironments. In Part I of this study,a gradient analy sis of 13 environmental variables identified temporal and spatial gradients in sagebrush coppice and interspacesoil surface cover types. Spatial cover types and temporal cyclic variations were distinct for both soil surface cover types. Part II of the study identified different spatial patterns for several sagebrush species. Wyoming big sagebrush (Artemisia tridentata Beetle&Young wyomingensis) and mountainbig sagebrush (A. tridentata Rydb. veseyana) were both associated with uniform distribution patterns. Low sagebrush (A. arbuscula Nutt. arbuscula) exhibited a random pattern. Spatial patterns of vegetation (random, clumped, and uniform distribution) effect the degree of tortusoity of flow paths and hydraulic roughness on rangelands.Additional refinements to the Chezy friction coefficient that incorporates estimates of roughness coefficients for rills and interrill areas should be considered through additional resistance factors such as plant dispersion coefficients. Copyright © 1994 Soil Science Society of America, 677 S. Segoe Rd., Madison, Wl 53711, USA. Variability ofRangeland Water Erosion Processes, SSSA Special Publication 38.
منابع مشابه
Efficiency Assessment of Rangeland Hydrology and Erosion Model (RHEM) for water erosion quantification (Case Study: Sangane Watershed-Iran)
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