太湖流域入湖河流土地利用类型对水质的影响——以乌溪港、武进港为例  

Impact of Land Use on Water Quality Along Inflow Rivers in Taihu Basin

作　　者：於梦秋[1] 蔡颖[1] 刘华[1] 龚蕾婷[1] 冷欣[1] 安树青[1] 

机构地区：[1]南京大学生命科学学院,南京210093

出　　处：《农业环境科学学报》2014年第5期1024-1032,共9页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(31100393);江苏省自然科学基金(BK2011577);973项目(2008CB418201);国际科技合作与交流专项(2011DFG33480);江苏省农业三项工程资助

摘　　要：以太湖流域典型入湖河流乌溪港以及武进港2009年和2010年5月末至6月初的水质监测数据为基础,结合断面土地利用数据,通过聚类和相关性分析识别河流污染物主要来源,并利用逐步多元回归揭示污染物的最显著响应范围。结果表明:研究区域水质指标与土地利用类型存在显著的响应关系,响应方式与响应程度强弱普遍在500～1000 m范围处发生转变。TN与水田、其他建设用地,NH3-N与水田、农村居民点和其他建设用地,PO4-P和TP与水田、城镇用地间分别存在显著的正相关。氮磷营养盐的最显著响应尺度基本在500～1000 m之间,而TOC主要受到500 m内离河岸较近的土地利用结构的影响。Relationship between land use and water quality along typical inflow rivers in the Taihu Basin were explored at semi-circle buffer zones（ 100 m, 200 m, 500 m, 1000 m, 1500 m and 2000 m）. Water samples were collected and analyzed for physico-chemical variables from late May to early June in both 2009 and 2010. Land use and land cover （LULC） data was also obtained in 2009. Statistical analysis including cluster analysis, correlation analysis and stepwise regression analysis were used to identify the major sources of pollutants and to determine the critical range of anthropogenic disturbance in the inflow rivers. The water quality in the inflow rivers was affected primarily by paddy field, residential, and construction land. Total N in water was positively correlated with paddy field and construction land, and NH3-N with paddy field, rural residential and construction land. Total P and PO4-P were significantly influenced by paddy field and urban residential. The critical range where water quality was severely impacted was 500-1000 m. Nitrogen and phosphorus in water were influenced most by human activities in the 500-1000 m buffer zone, while water TOC was mainly affected in the buffer zone of 500 m. The impacts of land use on water quality were reduced beyond the critical range, and even became non-significant.

关 键 词：太湖流域 土地利用 水质 缓冲区 

分 类 号：X524[环境科学与工程—环境工程]