Spatial pattern of soil and water loss and its affecting factors analysis in the Upper Basin of Miyun Reservoir

By interactive interpretation method with the assistance of GIS and RS, soil and water loss classification information in the upper basin of Miyun reservoir was derived from Landsat Enhanced Thematic Mapper (ETM) images and other relevant datum. The ecological and environmental back-round database was built in the region, which consists of the controlling factors, such as vegetation fraction, ravine density, isohyet map, to the intensity of soil and water loss. Although these factors, directly or indirectly influencing the process of soil erosion, are the key parameters in the widely applied revised universal soil loss equation (RUSLE), they may have the different contribution to the soil erosion tit the diverse spatial scale. The correlation between these environmental factors and soil erosion intensity was researched at a regional scale in the paper. The purpose of the paper is to bring the reference of the case study for the application of the revised universal soil loss equation in the same region, as well as to verify these factors data, and the veracity of the result of RUSLE application.