Soil Erosion Impact on Soil Fertility of Uncultivated Soil in the South Jiangsu Province

137Cs tracer method was used to investigate soil erosion intensity. It indicated that although the plant cover in sloping land of the south Jiangsu Province is well, there still was soil erosion in uncultivated soils. Soil erosion is not serious because of favorable condition of landform and climate. At the mean time soil particlesize distribution, contents of soil organic matter, total nitrogen, total phosphorus were measured to analyze the erosion effect on the physical and chemical properties of eroded soils. The results indicated that soil erosion would lead to soil particle coarseness. And the loss soil particles due to erosion were mainly silt. Moreover, the erosion may also caused soil nutrients decrease in the eroded soil. That is, the erosion would accelerate soil fertility degradation. Besides the erosion impacted on onsite soil fertility the loss of soil nutrient would threaten the water ecological environment in this area. Therefore, in order to overcome soil fertility degradation and its offsite ecological damage it is necessary to control soil erosion. 