Seasonal impact of agricultural non-point source pollution on water environment of Dianshan Lake Basin in Shanghai City | 农业面源污染对上海淀山湖流域水环境的季节性影响
2010
Wang Zhenqi, Shanghai Academy of Environmental Sciences, Shanghai（China） | Shen Genxiang, Shanghai Academy of Environmental Sciences, Shanghai（China） | Qian Xiaoyong, Shanghai Academy of Environmental Sciences, Shanghai（China）
Taken the Dalian lake region as the study area, which represents the typical agriculture production mode and agricultural non-point source pollution (ANSP) in Dianshan lake area in Shanghai City, basis on the characteristics of regional ANSP and combing with the seasonal water quality monitoring of Dalian Lake and reaches of its main influents, the laws of seasonal impact on the water environment were investigated. The results showed that, the seasonal change of TN and COD concentration of regional water had no significant correlation with the local ANSP emissions, while the seasonal changes of TP was consistent with seasonal emissions of regional TP pollution, and it had a significant correlation with Chl.a in four seasons, indicating that regional TP pollutant was the constriction factor influenced the eutrophication degree of Dalian lake. Because more than 80% of TP emissions came from the drainage of intensive pounds in winter, summer and fall, TP pollutant control should be adopted as the control target of regional ANSP control.
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