农业面源污染对上海淀山湖流域水环境的季节性影响

以能够代表上海淀山湖流域农业生产特征和农业面源污染特征的大莲湖区域为研究对象,在区域农业面源污染特征研究的基础上,通过对大莲湖及其主要入湖河段水质四季监测和分析,得出区域农业面源污染对水环境的季节性影响规律。结果表明,大莲湖水系TN及COD季节变化与区域农业面源污染排放相关性不显著,而水系TP季节变化与面源污染TP季节排放相吻合,且与叶绿素a（Chl.a）值在四季均具有较好的相关性,说明区域TP污染物是影响大莲湖富营养化的限制性因素。由于区域TP在冬季、夏季和秋季80%以上来自于精养鱼塘排水,因此精养鱼塘TP污染物的排放控制应作为区域农业面源污染控制的重点。

Seasonal Effect of Agricultural Non-point Source Pollution on Water Environment of Dianshan Lake Basin in Shanghai City

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,combing with the seasonal emission characteristics of local agricultural non-point source pollution,through the monitoring and analysis of water quality in Dalian lake and its major stream segment from river into the lake,the seasonal influence regularity of regional non-point source pollution on water quality of water system was investigated.The results showed that,the seasonal change of TN and COD in water system of Dalian lake had no significant correlation with the local agricultural non-point source pollution,while the seasonal changes of TP was consistent with seasonal emissions of agricultural non-point source pollution TP,and it had good correlation with chlorophyll-a value 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 in winter,summer and autumn came from the drainage of pound,emission control of TP pollutant in regional intensive pound should be adopted as the focus of the control on regional agricultural non-point source pollution.