Study on non-point source pollution from rivers into Poyang Lake based on hydrological base flow segmentation method

In order to study the pollution condition of non-point sources pollution of Poyang Lake Basin,the main rivers into Poyang Lake are taken as research objects,the runoff and water quality at the controlling stations along the rivers were synchronously monitored,and by hydrological base flow segmentation method and non-point pollution load estimation formula,the loss laws of N and P in the Poyang Lake Basin are analyzed.The results show that the load of NH3-N and TP from Ganjiang River,Fuhe River,Xinjiang River,Raohe River and Xiushui River and Boyanghe River and Xihe River are main sources of non-point sources pollution into the lake from upstream rivers,accounted for 68%~76% of total influx load;as for the spatial distribution,the Ganjiang River has a dominant proportion.Therefore,the non-point sources pollution should be focused in the treatment of water pollution of Poyang Lake,and the Ganjiang River should be emphasized.