湖泊科学2024，Vol.36Issue(4)：1025-1035,中插3-中插5,14.DOI:10.18307/2024.0413
三峡水库小江回水区水华暴发期浮游植物群落结构及其与环境因子的关系
Community structure of phytoplankton in different water layers and its relationship with environmental factors during the period of algal bloom in Xiaojiang River backwater area of Three Gorges Reservoir
摘要
Abstract
Since the impoundment of the Three Gorges Reservoir,severe algal blooms frequently occurred in tributaries especially in the Xiaojiang River,increasing the ecological vulnerability of the Three Gorges Reservoir.To examine the characteristics of tribu-tary algal blooms and its driving factors,a sampling program was conducted in Gaoyang section of Xiaojiang River from 2014 to 2021.Based on the data set,statistical methods such as One-way ANOVA,cluster analysis,percentage similarity analysis,and distance-based linear model were employed to explore the variations and correlations between phytoplankton and environmental fac-tors across different water layers and years during the bloom period.The results showed that the number of phytoplankton species had a range from 43 to 70 species during the bloom period,with a significant decrease in the number of cyanobacteria species in 2015.After 2018,the number of diatom species decreased significantly.The average cell density in each year was between 0.66x 106 and 61.28×106 cells/L,and showed a fluctuating upward trend from year to year.The average cell density in the surface layer was obviously higher than that in the middle and bottom layers.The concentrations of ten algal species,including Microcystis flos-aquae,Microcystis aeruginosa,and Microcystis indeterminata,had large variations throughout different water layers of the water col-umn.The daily average fluctuation of water level is a crucial environmental factor for the composition of phytoplankton communities in surface,middle,and bottom water layer.The relationship between the daily average fluctuation of water level and the dominant algal species showed an exponential decrease in the average phytoplankton density,in case that the daily water level declined by more than 0.5 m.This study can provide data support for controlling algal blooms in the Three Gorges Reservoir.关键词
三峡水库/小江/水华暴发/浮游植物/群落结构/水位变动Key words
Three Gorges Reservoir/Xiaojiang River/algal bloom/phytoplankton/community structure/water level fluctuation引用本文复制引用
胡莲,郑志伟,杨志,杨晴,邹曦,万成炎,张云昌..三峡水库小江回水区水华暴发期浮游植物群落结构及其与环境因子的关系[J].湖泊科学,2024,36(4):1025-1035,中插3-中插5,14.基金项目
国家重点研发计划项目(2022YFC3203905)、三峡工程运行安全综合监测系统-库区维护和管理基金项目(2136703)、中国三峡集团有限公司项目(0799253)和水利部重大科技项目(SKR-2022015)联合资助. （2022YFC3203905）
