白洋淀浮游植物群落特征OA

To reveal the community characteristics of phytoplankton and its ecological indicative role in Baiyangdian Lake,a quarterly sampling survey was carried out at 41 sites across the lake area in 2024.A total of 292 phytoplankton species belonging to 8 phyla were identified,with Chlorophyta(106 species)and Bacillariophyta(89 species)as the dominant groups.The annual average density of phytoplankton was 8.27×106 cells/L with significant seasonal variations,and the highest density was observed in the fourth quarter(12.80×106 cells/L),while the lowest was in the second quarter(3.50×106 cells/L).The dominant community showed clear seasonal succession characteristics,with Bacillariophyta dominating in the first and second quarters,while Cyanophyta dominating in the third and fourth quarters.Analysis of the Shannon-Wiener diversity index(H)and Pielou evenness index(J)demonstrated that the overall diversity and evenness of the phytoplankton community were at a good level.Spatially,the Gudingdian area exhibited the optimal aquatic ecological status,whereas the Duancun and Nanliuzhuang areas were relatively inferior.In conclusion,the phytoplankton community structure in Baiyangdian Lake was generally stable.The results of this study could provide a reliable scientific basis for the protection and management of the aquatic ecosystem in Baiyangdian Lake.