Ecological health assessment of urban lake based on phytoplankton—A case study of Lake Xihu, Tongling, lower reaches of the Yangtze River

为了解铜陵西湖浮游植物群落结构与水生态健康状况，于2016年9月至2017年7月进行6次调查.结果显示：（1）浮游植物共检出6门88种，总密度变化范围为8.20×105~1.60×108 cells/L，均值为2.19×107cells/L，生物量变化范围为1.34~27.76 mg/L，均值为9.45 mg/L，优势种为铜绿微囊藻（Microcystis aeruginosa）、浮游蓝丝藻（Planktothrix sp.）和微囊藻（Microcystis sp.）；（2） RDA分析表明浮游植物生物量主要受水温、悬浮物、总氮、亚硝态氮和总磷影响；（3）浮游植物隶属于22组功能群，基于功能群的Q指数表明，铜陵西湖水质整体处于“中等”状态，7月水生态状况最差，11月最佳；（4）依据候选参数与环境因子的相关性，最终选定生物量、密度和Margalef指数来构建铜陵西湖浮游植物生物完整性指数（P-IBI），其评估结果与Q指数呈显著正相关，但P-IBI评估结果（整体为“较差”状态）更为严格.本研究阐述铜陵西湖浮游植物群落结构特征，并基于浮游植物Q指数和P-IBI评估其生态健康状况，相关研究结果可为其水环境管理及城市湖泊生态健康评估提供一定的科学参考.;In order to establish phytoplankton community structure and assess ecological condition in Lake Xihu (Tongling), 6 times of sampling were conducted from September 2016 July 2017. A total 88 species phyla identified. The density varied 8.20×105 cells/L 1.60×108 cells/L, the mean was 2.19×107 cells/L. biomass 1.34 mg/L 27.76 mg/L, with a 9.45 mg/L. Phytoplankton mainly dominated by Microcystis aeruginosa, Planktothrix sp. sp.. affected water temperature, suspended solids, nitrogen, nitrite, phosphorus. There 22 functional groups identified, Q index indicated that lake moderate condition, worst best conditions November, respectively. Three critical indices, i.e., biomass, density, Margalef, selected biotic integrity based on (P-IBI) Xihu, according correlations among indices environmental parameters. Correlation analysis suggested P-IBI significantly positively correlated Q, while worse (the overall state is low). This study established evaluated its which will provide certain reference for environment management assessment urban.