摘要：The protection of water source area in Dan- jiangkou Reservoir Area is the key to ensure the successful implementation of the South-to-North Water Diversion Middle Line project. In recent years, the CODMn and TP of Hanjiang River water source of Danjiangkou Reservoir exceeded the standard. It has not yet reached the national surface water class II water quality standards, and there is a risk of eutrophication of the water body. The excessive CODm0 and TP standards were mainly caused by non-point source pollution from farmland, pollution from livestock and poultry breeding waste, rural domestic wastewater discharge, and soil erosion. Combined research on the water quality evaluation in the Danjiangkou Reservoir was carried out in this interesting paper in order to improve ability and level of environmental management. The results show that the contributor of pollution loads to the Danjiangkou Reservoir of Hanjiang River is very high, and its CODm0 and TP contribution rates reached 80.3% and 83.2%, respectively. Non-point source pollution appeared in the wet season in 2018, which is accounting for 78.5% and 84.2% of the total pollution loads of CODMn and TP, respectively. It is shown that non-point source pollution should be paid more attention.
