湖泊科学2026，Vol.38Issue(3)：955-969,15.DOI:10.18307/2026.0314
长江中游浅水湖泊磷赋存形态特征及其对浮游植物群落结构的影响:以湖北省长湖为例
Characteristics of phosphorus fractions and their effects on phytoplankton community structure in the middle reaches of the Yangtze River:A case study of Lake Changhu,Hu-bei
摘要
Abstract
Phosphorus is a key nutrient in lake ecosystems and a primary limiting factor for primary productivity,with its speciation and concentration significantly influencing phytoplankton community structure.To investigate the characteristics of phosphorus frac-tions and their effects on phytoplankton assemblages in Lake Changhu,a typical shallow lake in the middle and lower reaches of the Yangtze River,and to provide a scientific basis for its ecological restoration and precision management,we conducted seasonal sampling in March,May,September,and December 2024 at 10 sites,analyzing phosphorus forms,environmental variables,and phytoplankton community composition.Results showed that the annual average total phosphorus(TP)concentration was 0.117 mg/L,with levels ordered as September＞March＞May＞December and a decreasing gradient from west to east.Dissolved total phosphorus(DTP;mean of 0.060 mg/L)contributed slightly more to TP than particulate phosphorus(PP;mean of 0.056 mg/L).Seasonal variation in phosphorus forms was observed:PP dominated in March;PP slightly exceeded DTP in May;DTP prevailed in September and December,with dissolved organic phosphorus(DOP)predominant in September and dissolved inorganic phos-phorus(DIP)in December.DOP in September was significantly higher than in other months.Phytoplankton were dominated by Cyanophyta,Chlorophyta,Bacillariophyta,and Cryptophyta.Non-metric multidimensional scaling and permutational multivariate analysis of variance revealed significant temporal variation in community structure,showing a clear seasonal succession:from Bacil-lariophyta+Cryptophyta+Chlorophyta in March to Cyanophyta+Chlorophyta in May,then Cyanophyta in September,and finally Cryptophyta+Bacillariophyta+Cyanophyta+Chlorophyta in December.Dominant species included Cyclotella sp.(Bacillariophy-ta)in March,Merismopedia minima(Cyanophyta)in May,Komma caudata(Cryptophyta)in December,and Microcystis spp.(Cyanophyta)—a bloom-forming genus—in September,which was also dominant in May.Redundancy analysis and partial least squares path modeling identified DOP,water temperature,DTP,and suspended solids as the most influential factors on phyto-plankton community structure,with phosphorus fractions exerting significant direct effects.DOP showed the strongest effect,par-ticularly promoting Microcystis spp.abundance.These results demonstrate that phosphorus speciation significantly shapes phyto-plankton community structure in Lake Changhu and highlight the importance of quantitative assessment of different phosphorus forms—especially DOP—for evaluating ecological risks in eutrophic shallow lakes.关键词
磷赋存形态/浮游植物/长湖Key words
Phosphorus fraction/phytoplankton/Lake Changhu引用本文复制引用
杨新宇,郭祉宾,向邈,李学梅,朱挺兵,魏念..长江中游浅水湖泊磷赋存形态特征及其对浮游植物群落结构的影响:以湖北省长湖为例[J].湖泊科学,2026,38(3):955-969,15.基金项目
国家重点研发计划项目(2023YFD2400904)和中国水产科学研究院中央级公益性科研院所基本科研业务费专项资金项目(2023TD61)联合资助. （2023YFD2400904）
