Pollutant Source Analysis and Pollution Loads Estimation from Non-point Source in Chongqing Three Gorges Reservoir Region

According to the statistics of Chongqing Three Gorges Reservoir Region in 2000,this paper analyzes the affecting factors,including rural domestic waste,solid waste,fertilizer run off,pesticide run off,poultry and livestock farm,soil erosion,surface flow of the city,and their contribution to COD,NH3-N,TN,TP of non-point source pollutant.Furthermore,according to the pollution loads of dissolved form and pollution loads of particulate form by using RUSLE simulation and calculation,the total pollution loads of non-point source in Chongqing Three Gorges Reservoir Region are estimated.It concluded that the particulate form N loadings(50.1% of TN) is almost equal to dissolved form N loadings(49.9% of TN);but the particulate form P loadings(58.0% of the total phosphorus) is more than dissolved form P loadings(42.0% of the total phosphorus).It is a simple and direct method of estimating non-point source pollution loadings,which can be applied in the nutriment migration of the water body's bottom sludge,such as lake and reservoir etc.