衡水湖水体浮游藻类与富营养化评价指标关系分析

Evaluation and Analysis of Index Relationship on Water Body Phytoplankton and Eutrophication of the Hengshui Lake

衡水湖是河北省唯一的湿地型水利风景区。利用衡水湖生物监测资料，分析水体浮游藻类与富营养化评价各指标的关系。通过分析，在评价水体富营养化的5个项目中，总磷的变化对浮游藻类影响较大，总磷的变化，影响着浮游藻类的变化。其次为高锰酸盐指数。总氮浓度变化对浮游藻类几乎没有影响。叶绿素a和透明度，是评价和反映富营养化程度的一种体现。水温变化对浮游藻类影响敏感，但水温随季节变化，不是人为造成的。在评价的5个因子中，高锰酸盐指数水体是一个综合指标，总磷是水体富营养化的限制因子，因此，衡水湖水体的富营养化治理，控制总磷的人湖量是关键。

The Hengshui Lake is the only water conservancy scenic spot of wetland in Hebei. Using biological monitoring data of the Hengshui Lake, the paper analyzed and evaluated relationship between indexes of water body phytoplankton and eutrophication. According to the analysis, variety of total phosphorus has considerable effect on phytoplankton, and variety of total phosphorus influences variety of phytoplankton during evaluating the five items of water body eutrophication. Next it is potassium permanganate index. Total nitrogen density variety has little effect on phytoplankton. Chlorophyl a and diaphaneity is an embodiment that can evaluate and reflect the degree of eutrophication. Water temperature va- riety affects phytoplankton sensitively, but water temperature varies according to seasons, not human. During evaluating five factors, potassium permanganate index water body is aggregative index, total phosphorus is limiting factor. Therefore, it is the key to control the amount of total phosphorus in order to manage water body eutrophication of the Hengshui Lake.