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Evaluation on Sensibility of Soil Erosion of Harder-Hit Area of Wenchuan Earthquake

XU Tian-xian1,2,WANG Yu-kuan1,FU Bin1(1.Institute of Mountain Hazards and Environment,CAS,Chengdu,Sichuan 610041,China;2.Graduate School,Chinese Academy of Sciences,Beijing 100049,China)  
Selecting natural factors of eroding force of precipitation,soil erodibility,topography and vegetation coverage as the indexes for sensitivity evaluation of soil erosion,the paper prepares grading standards of evaluation indexes by using the Universal Soil Loss Equation(USLE),based on the characteristics of natural environment of the harder-hit area of Wenchuan earthquake.It produces single-factor map of sensitivity evaluation with the support of GIS,and completes overlapping calculation with single-factor based on the map and the function of spatial overlapping analysis of ArcGIS,and achieves integrated sensitivity evaluation of soil erosion.The outcomes show that highly and medium sensitivities are the main types of soil sensitivity,and the second is slight sensitivity,and the area proportion of insensitivity or non-sensitivity are smaller.The spatial distribution of soil erosion sensitivity assumes block-discontinuous,but the region of erosion sensitivity is relatively centralized and the distribution characteristics closely related to geomorphologic types.It puts forward relevant countermeasures for soil and water conservation based on different ratings of soil erosion sensitivity.
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