农业面源污染河流源解析及时空变化特征研究

Study of the Pollution Sources and Spatial-temporal Variation Characteristics of Agriculture Non-point Source Polluted Rivers

以太湖流域宜兴市新塍社区为研究区,分别测定研究区内各河流在丰水期和平水期的26个监测断面的污染指标。研究结果表明:丰水期和平水期首要污染因子均为高锰酸盐指数和氨氮。社渎港水质指数最高,污染最为严重,其首要污染因子为氨氮;根据空间聚类分析结果将研究区划分为东北Ⅰ区、西南Ⅱ区体现空间差异特征。Ⅰ区水质明显劣于Ⅱ区,丰水期Ⅰ区和Ⅱ区污染源方差贡献率分别为86.59%、73.20%;平水期分别为70.61%和86.46%。丰水期水质主要受畜禽养殖、种植业及上游客水影响较大,平水期污染源主要为生活污染源及内源污染。

On the basis of the demonstration research in Xincheng Community of Yixing in Taihu Lake watershed region,26 monitoring pollution indictors of the sections of each river in the demonstration region during the high flow period and the normal flow period were measured.The results showed that the primar^^pollution factors in the high flow period and the nor^nal flow period"were both the permanganate index and ammonia nitrogen.Water quality index ofShedu Harbor was the highest and pollution was the most serious withammonia nitrogen as its primary pollution factor.According to the results from spatial clustering analysis,the demonstration region was divided into northeast region I and southwest region II,indicating the spatial difference characteristics.Water quality of region I was obviously poorer than that of region II,and cumulated variance contribution ratios of the pollution sources in region I and region II were 86.59%and 73.20%in the high flow period and 70.61%and 86.46%in the normal flow period respectively.During the abundant water period,water quality was mainly affected by livestock breeding,crop farming and upstream foreign water.During the normal flow period,the main pollution sources were domestic pollution and endogenous pollution.