[目的]研究SFTWS 中浮游植物特征及其与水环境的相关性.[方法]以上海虹桥交通枢纽河段的梯级生态浮床系统为研究对象,探究浮游植物群落结构、多样性指数及其与水质净化效果的相关性.[结果]该河段共鉴得浮游植物7门57种.其中,蓝藻门12种,隐藻门2种,硅藻门10种,黄藻门1种,裸藻门7种,甲藻门1种,绿藻门24种;浮游植物优势种多为蓝藻门、硅藻门和绿藻门;生物密度远大于10×10ind./L,均为富营养型;香侬指教为0.6～2.2,丰富度为0.5～2.5,均匀度为0.35-0.85,说明水体属于富营养型;生物密度和种类与温度和N含量呈极显著正相关,说明浮游植物对N的吸收是系统除N的重要途径.[结论]该研究结果为城市河道治理与生态修复提供了参考.%[ Objective ] The aim was to carry out study on characteristics of phytoplankton and its correlation with water environment in SFT Ws. [ Method] Based on the pilot-scale SFTWs in Hongqiao transportation hub of Shanghai, phytoplanktons community structure, diversity index and their correlation with water purification performance were investigated. [ Result] 57 species of seven phylum of phytoplankton were detected in this tested river, including 12 species of Cyanophyta, 2 of Cryptophyta , 10 of Bacillariophyta, 1 of Xanthophyta, 7 of Euglenophyta,1 of Pyrrophyta and 24 of Chlorophyta, respectively. Additionally, it was found that Cyanophyta was the dominant phytoplankton, followed by Bacillariophyta and Cyanophyta. Biological density was far more than 10 × 105 ind./L, thus it could be considered that the river was eutrophic. The range of Shannon-Wiener index was 0. 6 - 2.2, Pielou index was 0. 5 - 2.5 and Margalef index(s) range was 0. 35 - 0. 85, which could further prove that the water was eutrophic. The biological density and species were significantly positively correlated with temperature and N content, indicating that the absorption of N by phytoplankton was the main N-removal pathway in SFTWs. [ Conclusion] This study provided basis for the river regulation and ecological restoration.
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