Abstract: By using GIS and RS techniques and RUSLE, the rainfall erosiv ity (R), soil erodibility (K), vegetation and management factor (C), and slope length and steepness factor (LS) around Hangzhou Bay of Zhejiang Province, China were calculated to make a comprehensive sensitivity evaluation o f soil erosion in the study area. In the meantime, the contribution of each natu ral factor, i.e., rainfall, soil texture, slope, and elevation, was analyzed, an d a new approach, overlapping and ordering method, was developed to identify the key affecting factors in the given sensitive areas. In the study area, soil ero sion was mainly at non-sensitive and low sensitive levels. The percentages of the areas with different soil erosion sensitivity varied with the strength of th e affecting factors. Soil erosion sensitivity increased with increasing rainfall and slope, and the percentage of the area with high soil erosion sensitivity wa s the largest at elevation 200〖KG-*2〗-〖KG-*7〗500 meters. The overlapping and ordering method was a practicable approach in identifying the key affecting fac tors in given sensitive areas, being helpful to understand the mechanisms causin g soil erosion.

Key words: pig slurry, wheat, medium and micro element, quality.