A survey on the biomass and communities of phytoplankton was conducted in June,Septem-ber,December of 2017 and March of 2018 in order to uncover the seasonal pattern of phytoplankton and their relationship with environmental factors in Changqiao Lake.The results showed that the phy-toplankton biomass ranged from 17.9～60.5 mg/L,with the highest in September and the lowest in June.The phytoplankton community was composed of Cyanophyta,Chlorophyta,Bacillariophyta,Pyr-rophyta,Euglenophyta,Cryptophyta and Chrysophyta.Cyanophyta was absolutely dominant and main-ly consisted of Limnothrix spp.,Cylindrospermopsis raciborskii and Pseudanabaena spp..The results of analysis of variance and analysis of similarity displayed that phytoplankton biomass and community structure(phylum and genus levels)both exhibited a significant seasonal variation.The Pearson corre-lation analysis revealed that total phytoplankton biomass was significantly and positively correlated with TN,N∶P and NO3-N.The Redundancy analysis indicated that WT,TN,TP,N∶P and NO3-N were significant factors influencing the change of phytoplankton communities.Variation partitioning analyses further demonstrated that WT,TN and TP independently explained 12.6％,20.9％and 5.1％of community variation,and the interaction of TP with WT and TN accounted for 2.1％and 1.1％of the total variance,respectively.Our results will provide basis for the environmental protection,man-agement and ecological evaluation of Changqiao Lake.
维普
万方数据