基于ArcGIS的乌梁素海水质及富营养化评价

Pollution Analysis and Eutrophication Assessment of Wuliangsuhai Lake by ArcGIS

采用2009年乌梁素海观测数据,运用泛克里格插值法,分析了乌梁素海水质参数时空分布特征及叶绿素a与氮、磷浓度间的相关关系,在此基础上,利用ArcGIS软件的空间分析模块定量分析了乌梁素海水质现状和富营养化程度。结果表明:氮、磷营养盐具有明显的时空变异性,叶绿素a在空间上与氮、磷营养盐具有相似的分布特征,整体呈北高南低、西高东低、入口高出口低的趋势;叶绿素a与总氮、总磷存在显著相关关系;高中营养和富营养型水域面积为232km2,占湖泊总面积的82%;没有贫营养型水域,大部分水域处于富营养化状态,程度由北向南递减,入口附近富营养化程度最高。

Based on the conventional monitoring data from Wuliangsuhai Lake in 2009,this paper selected universal kriging Model to analyze the distributing of nutrient temporal and spatial distribution and the relationship between chlorophyll-a and TN（TP）.The results show that a） nitrogen and phosphorus concentration have obvious temporal and spatial changes,chlorophyll-a and nitrogen have similar distribution in space,the overall trend is high in the north and low in the south,west higher than the east,entrance higher than exporting;b） occurrence of high nutrition and nutrient-rich a total area of 232 km2,accounting for 81% of the entire lake area;c） Wuliangsuhai Lake has no area of poor nutritional status,most waters area in the eutrophication status,eutrophication has a decreasing trend from north to south and near the entrance is the highest eutrophication of the whole lake.