Analysis of Soil Erosion Environment Background in China Hills

There is more than 70% mountain area in China, and these mountains are the resources of rivers, such as Changjiang river, Huanghe river. Moreover, these hills are resources of branches of main rivers. Soil erosion in these areas will lead to river environment change, and causes more disasters, such as flood. With RS and GIS supported, this paper analyses features of soil erosion environment background in these hill areas, then we suggest some points for treating soil erosion. The steps as fellow: first, we extract hill coverage from DEM with the elevation less than 1,000m according to traditional method, second, we set hill coverage as a mask in ARC/INFO to get environment background coverage, that is we have slope coverage, NDVI coverage, etc. Third, we combine these coverages with soil erosion coverage in ARC/INFO. Soil erosion is made by multi-factor. This paper discusses soil erosion of hill under different eco-environment background. All of soil erosion type and intensity takes place in china hills. With the temperature, rainfall, NDVI, etc changing, the soil erosion changes in zone. From results, for the eco-environment background zone law, the intensity of water soil erosion decreases from east to west, which shows some treatments are taken in east China. However, the change direction of the intensity of wind erosion is contrary to water erosion'. The intensity of water erosion is great than wind erosion' in interchange of water and wind erosion. So we suggest some treatments for controlling soil erosion.