Evaluation of regional ecological risk of soil erosion based on GIS

In order to support the soil and water conservation,planning and the assessment of soil erosion,this paper introduced the concept of ecological risk into the research of water and soil conservation.In this article,we defined the regional ecological risk of soil erosion,and showed how to evaluate it,then built the framework of the evaluation.We had made a preliminary application in Yanhe River Basin.The results showed that the key controlling areas in Yanhe River Basin include the middle Yanhe River Basin,Ansai County and Baota district.Regional ecological risk of soil erosion can help the government to make the decision in soil and water conservation management.