太湖水体富营养化中农业面污染源的影响研究

太湖流域地处长江三角洲核心部位,是我国的工业经济中心,但同时也是水体富营养化最严重的地区之一。文章通过实地调研、采集得到太湖流域污染的相关数据资料,运用结构解析模型(ISM)建模,通过研究太湖蓝藻各诱发因子的主次关系,对太湖蓝藻危机爆发的成因做了深入的分析。并以GIS为平台核算其耕地面积,结合当地土壤数据及作物特征,计算出了太湖流域农业每年磷的排放量,占总磷排放量的70.7%,得出农业面源产生的的氮、磷流失是引起太湖水体富营养化的重要原因。

Impact of Agricultural Non-point Source Pollution in Eutrophic Water Body of Taihu Lake

Taihu Lake basin in the heart of Yangtze River Delta is a regional industrial and economic centre in China,with the quality as one of serious eutrophical water bodies. Based on field study and ISM modeling,the correlation between primary and secondary inducing factors of algae crisis was discussed and factors of algae in the Lake crisis were analyzed. With GIS as a platform to estimate arable land,also combined with local soil and crop characteristics,annual amount of agricultural phosphorus emission in the basin was calculated,which accounted for 70.7% of annual total phosphorus emission. It was concluded that loss of nitrogen and phosphorus from agricultural non-point source was the most important contributor of the Lake eutrophication.