滴水湖入湖河道浮游植物群落季节变化及其与环境因子的关系

Seasonal variation of phytoplankton community and its relationship with environmental factors in the influent rivers of Dishui Lake

为了探究滴水湖入湖河道浮游植物群落的时空分布及其与环境因子的关系,于2018年9月至2019年8月,在入湖口、内、中、外涟河共设置12个采样点,开展浮游植物群落与环境因子调查。结果表明,调查区域共采集到浮游植物8门93属232种。总物种数中绿藻门占41.81%,硅藻门占22.41%,蓝藻门占18.97%,裸藻门占11.64%。内涟河与中涟河浮游植物种类数较高,特别是位于中涟河E港的S8。调查河段浮游植物丰度为584×10^(4)~1985×10^(4)个/L,其组成以绿藻、蓝藻为主,春季丰度最高,冬季丰度最低。各样点浮游植物丰度水平分布变化大,内涟河环湖北二路样点浮游植物丰度显著高于调查河段的其他样点。Person相关性分析显示,影响浮游植物丰度的主要因子是pH、溶解氧、总氮及硝酸盐氮,与盐度、亚硝酸盐及透明度则未显出相关性。典范对应分析结果表明,水温、溶解氧、总磷、氨氮和硝酸盐氮是影响浮游植物组成的主要因素。

In order to clarify the spatial and temporal distribution of phytoplankton community and its relationship with environmental factors in the influent rivers of Dishui Lake,twelve sampling sites were set up at the lake inlet,Neilian River,Zhonglian River and Wailian Rivier,and the phytoplankton there were field surveyed from Sept.2018 to Aug.2019.In total,8 phyla,93 genera and 232 species of phytoplankton were collected in the survey area.Among the total,species in Chlorophyta accounted for 41.81%,species in Bacillariophyta for 22.41%,species in Cyanophyta for 18.97% and species in Euglenophyta for 11.64%.The number of phytoplankton species in Neilian River and Zhonglian River was high,especially in the sample 8.The phytoplankton density ranged from 584×10^(4) cells/L to 1985×10^(4) cell/L.The phytoplankton was mainly composed of Chlorophyta and Cyanobacteria,with the highest density documented in spring and the lowest in winter.The phytoplankton density in the second route of Neilian River was significantly high than that in other sampling sites.Pearson correlation analysis showed that pH,DO,TN and NO_(3)^(-)-N were the main factors affecting phytoplankton density,but there was no correlation wss found between the density and sal,NO_(2)^(-)-N and SD.Canonical correspondence analysis showed that WT,DO,TN,NH_(4)^(+)-N and NO_(3)^(-)-N are the main factors affecting phytoplankton composition.