沈阳大学学报（自然科学版）2026，Vol.38Issue(4)：288-296,9.
水阳江宣城段浮游植物群落结构及其关键驱动因子
Phytoplankton Community Structure and Its Key Driving Factors in Xuancheng Section of Shuiyang River
摘要
Abstract
To elucidate the spatiotemporal distribution characteristics of phytoplankton community structure and its key driving factors in the Xuancheng section of the Shuiyang River,water environmental factors and phytoplankton were monitored at 10 sampling sites in August(summer)and November(autumn)of 2022.Pearson correlation analysis and structural equation modeling(SEM)were used to identify the main environmental factors affecting the phytoplankton community.The results showed that a total of 175 species belonging to 7 phyla were identified.Cyanobacteria were the dominant phylum in summer(August),while Bacillariophyta(diatoms)dominated in autumn(November).Algal density and biomass were higher in summer than in autumn.Spatially,in summer,phytoplankton density and biomass were highest in the downstream,followed by the midstream,and lowest in the upstream.In autumn,the highest values were observed in the midstream,with no significant difference between the upstream and downstream.The diversity indices were highest in the upstream,followed by the midstream,and lowest in the downstream.Pearson correlation analysis revealed that algal biomass was extremely significantly positively correlated with the mass concentrations of total phosphorus(TP)and ammonia nitrogen(NH4+-N)(P＜0.001),and positively correlated with water temperature(WT)and pH(P＜0.05).Structural equation modeling indicated that the effect of nutrient indices on the phytoplankton community(path coefficient=0.96)was greater than that of physicochemical factors(path coefficient=0.78).Among them,ρ(TP)andρ(NH4+-N)were the key driving factors,with path coefficients of 0.95 and 0.91,respectively.The water quality in the downstream section of the Xuancheng section of the Shuiyang River was relatively poor,suggesting that control measures for domestic sewage and urban non-point source pollution in the mid-to-lower reaches should be prioritized.关键词
水阳江宣城段/浮游植物/群落结构/驱动因子/结构方程模型Key words
Xuancheng section of Shuiyang River/phytoplankton/community structure/driving factors/structural equation modeling分类
资源环境引用本文复制引用
郑志侠,沈思宇,叶碧碧,袁震,李励..水阳江宣城段浮游植物群落结构及其关键驱动因子[J].沈阳大学学报（自然科学版）,2026,38(4):288-296,9.基金项目
国家重点研发计划项目(2021YFC3201003) （2021YFC3201003）
安徽省高校自然科学研究项目(KJ2020ZD59). （KJ2020ZD59）
