由于流域人类活动和气候干旱化的影响, 白洋淀水体污染与富营养化日趋严重。通过对白洋淀湖水化学成分 的分析, 并运用与湖泊富营养化关系最为密切的 Chla、 TN、 TP、 COD Mn 和 SD 作为评价参数, 采用综合营养指数法确 定湖水营养类型。湖水水质监测数据分析表明, 白洋淀为重碳酸类钠组ò 型水的偏碱性湖泊, 综合营养指数法确定 湖水为中2富营养级湖泊水体。主成分分析法结果显示, 湖泊污染的主要因子是 T P。借助硅藻及其组合分析了湖 泊富营养化状况, 发现白洋淀硅藻属种以耐营养种梅尼小环藻 Cyclotella meneghiniana( 20. 43%) 和 Cyclostepha2 nos tholif ormis(25. 40%)为组合特征, 表明湖泊水体已处于富营养化状态, 水环境状况堪忧。

The impacts of human activities and dry climate aggravate the water pollution and eutrophication in the Baiyang Lake. Through the analysis of hydro 2chemical compositions of the water, five indexes[Chla, TN, T P, COD Mn, and SD] , which are re 2 lated to water eutrophication, are selected as evaluation parameters, and the comprehensive nutrition index method is adopted to determine the water eutrophication type. T he results of water quality monitoring data show that the type of water is CNaII, and the lake is in mesotrophic or eutrophic state determined by the comprehensive nutrition index method. The principal component analysis results show that TP is the main factor to cause water pollution in the lake. According to the analysis of diatom and its combination, the diatom in the lake is characterized by the combination of eutrophic species Cyclotellameneghiniana ( 20. 43%) and Cyclostep hanos tholif ormis ( 25. 40%) , which indicates that the lake is in the eutrophication state and water environment is in danger.

国家自然科学基金面上项目/ 全新世以来东平湖变迁与黄河洪水关系及动力机制研究0( 41072258) ; 山东省水土保持与环境保 育重点实验室开放基金/ 人类活动对山东典型湖库生态环境影响的定量研究0( ST KF2012001