Estimated Nutrient Export Loads Based on Improved Export Coefficient Model in Xitiaoxi Watershed
基于改进输出系数模型的流域营养盐输出估算

It is very important to estimate nutrient export loads from watershed, which is beneficial to water environmental management. The export coefficients for major landuse types were evaluated by field surveying data, in addition the spatial distributions of precipitation and runoff were considered, to improve on export coefficient model (ECM), then integrated ECM into geographical information system to compose half-distribution model of export coefficients. Estimated nutrients export loads based on the ECM in Xitiaoxi watershed located upper of Taihu Lake area. Results show that the export load for TN and TP was 2 121.3 t and 49.3 t respectively, which provides important reference value for nonpoint source pollution management.