湖荡湿地对输水河道磷的截留净化作用

Interception and decontamination of phosphorus in input watercourse with lake wetland

选取太湖流域望虞河沿线的鹅真荡和漕湖两个湖荡湿地分析湖荡湿地对水体中总磷、总溶解磷、颗粒磷以及正磷酸盐的截留净化作用和影响因子。结果表明:①湖荡湿地对输水河道中磷有不同程度的截留净化作用,对颗粒态磷和正磷酸盐的截留净化作用最为显著。②湖荡的面积、空间结构、河水在湖荡输入、输出点的位置以及水生植物分布在一定程度上影响湿地对磷的截留净化作用;③水温、pH、DO浓度和Chl-a浓度与水体中的磷浓度均呈极显著负相关,水温、pH、DO浓度与Chl-a浓度均呈极显著正相关,因此藻类是影响湖荡净化磷的重要因子。

The interception and decontamination of TP, TDP, PP, and PO3 and their impact factors were analyzed in Ezhen Lake and Caohu Lake, which are located in the waterway of the Wangyu River in the Taihu Basin. The main results are as follows： （1） The two lake wetlands can remove phosphorus, especially PP and PO43, from the input watercourse by interception and decontamination. （2） Factors like the area and spatial shape of the lake, the location of sites of water input and output, and the distribution of hydrophytes in wetlands affect the removal rate of phosphorus. （3） Significantly negative correlations were found between water temperature, pH, DO concentration, Chl-a concentration, and phosphorus, while the correlations between water temperature, pH, DO concentration, and Chl-a concentration were significantly positive. Therefore, algae are a key factor influencing phosphorus removal.