Evaluation On Agricultural Non-point Source Pollution Potential Of Beiyunhe Catchment In Tongzhou District

In this paper, Data of agricultural non-point source pollution-related socio-economic, natural environment in Beiyunhe river basin (tongzhou district) were collected.â‘ the GIS technology was combined to install the non point source pollution data base, which can be used in the study of APPI.â‘¡The main factors in agricultural non-point source pollution were analyzed: rainfall runoff pollutants transport (R), pollutants in the sediment to bring the loss of body (SP), the main pollutants of chemical fertilizer (CU), People and animal loading of major pollutants ( PAL)â‘¢As the ARC-GIS visualization tool was put on performance for the study area of the non-point source pollution in the township / farming methods, different weights on the factors above were assigned, and then the source of pollution, patterns of the pollution, high risk area were identified.â‘£Due to the high risk area, useful methods were concluded correspondently.Research shows that Guoxian Town, Zhangjiawan Town, Yujiawuixiang town, West Town, and Lucheng Town non-point source pollution potential index occurred in the larger volume, in which Guoxian County, non-point source pollution potential index of the largest (1.23), For the agricultural land in this area count in a high value (67.25%). People and animal loading value was significantly higher than other townships, mainly because of livestock and poultry industry in the town account for a great number. The number of cattle farms throughout the basin is the largest of all towns and townships. APPI value in Zhangjiawan town is also high, mainly because of the area under cultivation, the eco-grape orchard was built in the town; It is flat in Yujiawuhuizu Town terrain, with the result that the volume index of its chemical fertilizer seemed more identifiable.