湖泊科学2024，Vol.36Issue(5)：1353-1365,中插4,14.DOI:10.18307/2024.0512
丰水期鄱阳湖浮游植物群落构建机制及影响因素
Phytoplankton community assembly mechanisms and driving factors during wet seasons in Lake Poyang
摘要
Abstract
It is of great significance to reveal the mechanism of phytoplankton community structure in aquatic ecosystem for effective prevention of harmful algal blooms and scientific management of aquatic ecosystem.In order to reveal the mechanism and its driving factors in Lake Poyang,one of the river-connected lakes in the middle and lower reaches of the Yangtze River,the phytoplankton and its functional groups and the environmental factors of 38 sampling sites were investigated in August 2020 in the lake.A total of 91 spe-cies in 59 genera from 7 phyla were detected,among which Chlorophyta(27 genera and 46 species),Bacillariophyta(13 genera and 22 species)and Cyanobacteria(8 genera and 11 species)accounted for 50.5％,24.2％and 12.1％of the total species,respectively.Phytoplankton can be divided into 23 functional groups,with N,G,P,W1 and Lo as the dominant ones,indicating that Lake Poy-ang was at the risk of eutrophication.The phytoplankton community structure varied significantly between in the bay and the main channel area of the lake,with higher values of Shannon-Wiener diversity index,Simpson diversity index and Pielou evenness index of phytoplankton in the bay area(Mann-Whitney U test,P＜0.001).Correlation analysis between the community distance and the envi-ronmental and geographic distances showed that both environmental filtering and spatial dispersal constraints influenced phytoplankton communities and its functional groups.Variation partitioning analysis,C-score analysis and modified stochasticity ratio analysis further clarified that the deterministic process(environmental filtering)was dominant and had a greater influence on the functional groups.Constrained ordination analysis showed that turbidity,CODMn and conductivity were the most important environmental factors driving the change of phytoplankton community structure in Lake Poyang,while temperature,conductivity and CODMn were the main environmental factors influencing the community structure of phytoplankton functional groups in Lake Poyang.关键词
鄱阳湖/浮游植物/功能群/群落结构/环境因子/空间因子/确定性过程Key words
Lake Poyang/phytoplankton/functional groups/community structure/environmental factors/spatial factors/deter-ministic process引用本文复制引用
吴强,刘聚涛,温春云,杨平,刘隆凌峰,王飞..丰水期鄱阳湖浮游植物群落构建机制及影响因素[J].湖泊科学,2024,36(5):1353-1365,中插4,14.基金项目
国家自然科学基金项目(42161016)、江西省水利科学院江西省鄱阳湖水资源与环境重点实验室开放研究基金项目(2022SKSH05)、国家重点研发计划项目(2023YFC3209000,2023YFC3208700-05)和江西省重大科技专项(20213AAG01012)联合资助. （42161016）
