2010•Yingyong jichu yu gongcheng kexue xuebaoRequires access

Estimating Soil Erosion in Small Watershed of Karst Valley Area Using GIS

Chaofu Wei

Abstract

oil erosion is one important factor for land degradation and productivity reduction in karst areas of southwest China.Rocky desertification was introduced to Revised Universal Soil Loss Equation(RUSLE) to estimate soil erosion in Mu-du-he small watershed in Chongqing.The results showed that the actual soil erosion amount and soil conservation amount were 40011.51t/a and 835963.94t/a,respectively.The discrepancy in the actual soil erosion modulus of total area and the actual soil erosion modulus of erosion area increased with the karst rocky desertification.The actual soil erosion modulus of erosion area was more feasible for describing soil erosion in karst area.The paddy and wood land have the best capacity to conserve soil,whilst the dry land has the worst one.The effective measurements for soil erosion control include afforestation barren hills and steep slopes,conversion cropland to forest and grassland for slopes steeper than 25°.

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Key concepts: Erosion, Environmental science, Dryland salinity, Soil conservation, Universal Soil Loss Equation, Karst, Watershed, Hydrology (agriculture)