白洋淀水环境质量评价

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、CODMn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Ⅱ型水的偏碱性湖泊,综合营养指数法确定湖水为中-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TP。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Cyclotellameneghiniana(20.43%)和Cyclostephanos tholiformis(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。

Assessment of water environment quality of Baiyang Lake

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 2lated to water eutrophication, are selected as evaluation parameters, and the comprehensive nutrition index method is adopted todetermine the water eutrophication type. T he results of water quality monitoring data show that the type of water is CNaII, andthe lake is in mesotrophic or eutrophic state determined by the comprehensive nutrition index method. The principal componentanalysis results show that TP is the main factor to cause water pollution in the lake. According to the analysis of diatom and itscombination, 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 isin danger.