As the only natural lake in the lower Yellow River and an important hub of the eastern route of the South-to-North Water Diversion Project,its ecological environment security has great impacts on the ecological environment protection in the Yellow River basin and the security of water supply in the northern China.In order to clarify the plankton community characteristics and its environmental driving factors in the autumn of Dongping Lake,water samples from 28 sampling sites were collected in September 2021,and the comprehensive trophic level index method,ecological diversity index method,correlation analysis and redundancy analysis were used.In this study,a total of 73 taxa of phytoplankton(genera or species)in 8 phyla and 10 taxa of crustacean zooplankton(genera or species)in 2 phyla were identified among which Chlorophyta,Cyanophyta and Bacillariophyta were the main phytoplankton,and Copepoda and Cladocerans were the main crustacean zooplankton.Among phytoplankton,Pseudoanabaena spp had the highest dominance(Y=0.205),and Cyclops had the highest dominance(Y=0.305)in crustacean zooplankton.The comprehensive trophic level index(TLI)and the spatial distribution of the biological density of phytoplankton in the autumn of Dongping Lake was strongly correlated,with high values in the east part and northeast bank of the lake and low values in the center and west lake areas.The Shannon-Wiener diversity index,Pielou evenness index and Margalef richness index of phytoplankton were 3.70,0.75 and 1.29,corresponding to the pollution conditions of clean,light pollution and moderate pollution,respectively.Redundancy analysis revealed that TN and DO were the main environmental driving factors affecting the growth of phytoplankton and crustacean zooplankton,respectively,in the autumn of Dongping Lake.
维普
万方数据