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

作　　者：Chaowei Lai Zhen Ma Zaihua Liu Hailong Sun Qingchun Yu Fan Xia Xuejun He Qian Bao Yongqiang Han Xing Liu Haibo He 

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,CAS,Guiyang 550081,China [2]School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Hefei University,Hefei 230601,China [5]Sichuan Normal University Key Laboratory of Land Resources Evaluation and Monitoring in Southwest China of Ministry of Education,Chengdu 610066,China

出　　处：《Journal of Environmental Sciences》2023年第9期68-83,共16页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.42130501,42141008,and 41977298);the Strategic Priority Research Program of the Chinese Academy of Science(No.XDB40020000);Special thanks to the Dali Erhai Research Institute for supporting us in sampling Erhai Lake.

摘　　要：The eutrophication of lakes is a global environmental problem.Regulating nitrogen(N)and phosphorus(P)on phytoplankton is considered to be the most important basis of lake eutrophication management.Therefore,the effects of dissolved inorganic carbon(DIC)on phytoplankton and its role in mitigating lake eutrophication have often been overlooked.In 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 investigated.The 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 TP.When 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.Additionally,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 Cyanophyta.Thus,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 

分 类 号：X524[环境科学与工程—环境工程]