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Alleviating eutrophication by reducing the abundance of Cyanophyta due to dissolved inorganic carbon fertilization:Insights from Erhai Lake,China

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Journal of Environmental Sciences 2023年第9期131卷 68-83页

作者： Chaowei Lai Zhen Ma Zaihua Liu Hailong Sun Qingchun Yu Fan Xia Xuejun He Qian Bao Yongqiang Han Xing Liu Haibo He State Key Laboratory of Environmental Geochemistry Institute of GeochemistryCASGuiyang 550081China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China University of Chinese Academy of Sciences Beijing 100049China Hefei University Hefei 230601China Sichuan Normal University Key Laboratory of Land Resources Evaluation and Monitoring in Southwest China of Ministry of Education Chengdu 610066China

The eutrophication of lakes is a global environmental *** nitrogen(N)and phosphorus(P)on phytoplankton is considered to be the most important basis of lake eutrophication ***,the effects of dissolved inorganic carbon(DIC)on phytoplankton and its role in mitigating lake eutrophication have often been *** this study,the relationships between phytoplankton and DIC concentrations,carbon isotopic composition,nutrients(N and P),and hydrochemistry in the Erhai Lake(a karst lake)were *** results showed that when the dissolved carbon dioxide(CO_(2)(aq))concentrations in the water were higher than 15μmol/L,the productivity of phytoplankton was controlled by the concentrations of TP and TN,especially by that of *** the N and P were sufficient and the CO_(2)(aq)concentrations were lower than 15μmol/L,the phytoplankton productivity was controlled by the concentrations of TP and DIC,especially by that of ***,DIC significantly affected the composition of the phytoplankton community in the lake(p<0.05).When the CO_(2)(aq)concentrations were higher than 15μmol/L,the relative abundance of Bacillariophyta and Chlorophyta was much higher than those of harmful ***,high concentrations of CO_(2)(aq)can inhibit harmful Cyanophyta blooms.

关键词： Dissolved inorganic carbon Nutrients limitation Phytoplankton species composition eutrophication management Karst lake

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