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| Evaluation of Soil Erosion Based on GIS in the Drainage Basin of Dahuofang Reservoir and Its Influencing Factors |
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| KeyWord:RUSLE; GIS; soil erosion; drainage basin of Dahuofang Reservoir |
| Author Name | Affiliation | | LIU Rui-min | State Key Lab. of Environ. Simulation and Pollution Control, School of Environment, Beijing Normal University | | WANG Jia-wei | State Key Lab. of Environ. Simulation and Pollution Control, School of Environment, Beijing Normal University | | ZHANG Pei-pei | State Key Lab. of Environ. Simulation and Pollution Control, School of Environment, Beijing Normal University | | CHEN Ya-xin | State Key Lab. of Environ. Simulation and Pollution Control, School of Environment, Beijing Normal University |
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| Abstract: |
| Recently, increasing nutrient concentrations have been observed in many surface waters in China and soil erosion is the main contributor to water pollution. The socio-economic and physical factors which cause soil erosion therefore need to be addressed. Based on the platform of Arcview 3.3, soil erosion in the drainage basin of Dahuofang Reservoir was evaluated using Revised Universal Soil Loss Equation（RUSLE）. The factors related to soil erosion are input to Arcview in raster, which include DEM, landuse types and soil types. Then cells based on soil loss and erosion intensity were calculated based on map algebra. The results indicate that：a）soil loss in most areas was less than 50 t·km-2·a-1 in 2000, meaning that there was proper soil and water conservation in the studied areas; b）the order of the descending degrees of soil erosion in different landuse types was dryland, wetland, and middle coverage grassland. In general, erosion on dryland was more serious than on any others; among various soil types, erosion on paddy soil was the worst while Dark-Brown soil was the slightest; in the case of different slope gradients, soil erosion at the grade of 0~3 degrees was the worst while soil erosion at the grade of more than 25 degrees was the slightest; and c）the worst soil erosion areas were the agricultural fields. The socio-economic factors were the key factors which influenced the problems of runoff and erosion. |
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