Factor Analysis of Soil and Water Loss in Qinling Mountains Small Watershed Based on Grey System Theory：A Case Study of Zhaigou Watershed in Ningshan County of Shaanxi Province

Factors affecting soil erosion in small watershed include rainfall factor and vegetation coverage factor.Taking five eroded observation plots with different vegetation coverage in Zhaigou small watershed of Ningshan county，Shaanxi province as research object，using gray relational degree method，influencing factors were analyzed comparatively.It would provide references for prevention and control of soil erosion.