淮河中游浮游植物群落结构时空格局及影响因子

Pattern and Influence Factors of Phytoplankton Community Structure in Middle of Huaihe River

为了解淮河中游浮游植物群落时空格局,于2019年6月(平水期)、9月(丰水期)和2020年2月(枯水期)对淮河中游河段28个断面的浮游植物和环境因子进行调查。淮河中游共鉴定出8门63属128种,平水期、丰水期和枯水期物种数分别为94、77和68,密度分别为0.06×10~6~16.04×10~6、0.47×10~6~41.62×10~6和0.43×10~6~10.79×10~6 cell·L^(-1),生物量分别为0.03~3.54、0.12~14.99和0.14~25.48 mg·L^(-1),优势种分别以微囊藻、微囊藻和梅尼小环藻等为主。空间格局方面,闸上的浮游植物密度和生物量显著高于其他区段。浮游植物密度与总磷、温度、高锰酸盐指数等环境因子呈显著正相关。CCA分析表明温度是影响淮河中游干流浮游植物群落结构的主要环境因子。

In order to investigate the spatiotemporal pattern of phytoplankton communities and the determining factors in the middle of the Huaihe River,phytoplankton and environmental factors in 28 sections of the mid-stream river were collected and analyzed in June 2019(flat-water period),September(high-water period) and February 2020(dry-water period).The results showed that phytoplankton species were detected as 8 Phylum,128 species in the middle of the Huaihe River.The densities of phytoplankton were 0.06×10~6~16.04×10~6,0.47×10~6~41.62×10^(6)and 0.43×10~6~10.79×10^(6)cell·L^(-1) in the three water periods.The biomass of phytoplankton was 0.03~3.54,0.12~14.99 and 0.14~25.48 mg·L^(-1).Microcystis,Microcystis,Cyclotella meneghiniana were main dominant species in three water period.In spatially,density of up-gate presented significantly higher than mid-gate,biomass of up-gate presented significantly higher than under-gate.Total phosphorus,temperature and permanganate index were significantly positively correlated with phytoplankton density through Pearson correlation analysis.Temperature was the main environmental factor correlate with phytoplankton community structures through CCA analysis.