文献类型：期刊文献

英文题名：Relationships between biomass of phytoplankton and submerged macrophytes and physicochemical variables of water in Lake Caohai, China: Implication for mitigation of cyanobacteria blooms by CO2 fertilization

作者：Zhang, Yi Liu, Zaihua Wu, Yang Ma, Song Cao, Wenfang Lai, Chaowei Bao, Qian Xia, Fan Sun, Hailong Hu, Yundi Liu, Xing He, Haibo

第一作者：Zhang, Yi

通信作者：Liu, ZH[1]

机构：[1]Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China;[2]Guizhou Inst Technol, Sch Resources & Environm Engn, Guiyang 550003, Guizhou, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]Guizhou Normal Univ, Sch Geog & Environm Sci, Guiyang 550025, Guizhou, Peoples R China;[5]Sichuan Normal Univ, Key Lab Land Resources Evaluat & Monitoring Southw, Minist Educ, Chengdu 610066, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.

年份：2023

卷号：617

外文期刊名：JOURNAL OF HYDROLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000923698700001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (42141008, 42130501, 42072278, 41921004, 41977298) , Strategic Priority Research Program of the Chinese Academy of Sciences (XDB40020000) and Natural Science Foundation of Guizhou Province ( [2020] 1Y412) . Special thanks are given to Prof. Dr. Derek Ford (McMaster University, Canada) for his thoughtful comments and corrections, which greatly improved the original draft.

语种：英文

外文关键词：CO 2 fertilization; Mitigating cyanobacteria blooms; Enhancing carbon sequestration; Phytoplankton composition; Submerged macrophytes; Karst aquatic ecosystems

摘要：Reducing nutrient input in aquatic ecosystems has been widely recognized as a way to mitigate eutrophication. The paradigm of nutrient limitation by N and P is pervasively accepted, without considering the possibility of C limitation. However, our assumption that C might affect the aquatic biological composition, lacks fieldwork support. We tested the co-limitation of C/N/P on the growth of submerged macrophytes and phytoplankton in the Caohai Lake, a typical shallow karst lake in southwestern China. This study documented the seasonal variations in the concentration and comparative availability of nutrients C/N/P, in addition to physicochemical parameters, submerged macrophytes biomass, and phytoplankton composition in the lake. Our results show that dissolved inorganic carbon plays a substantial role in enhancing the primary production of phytoplankton and macrophytes, which suggests that primary production can be suppressed not only by P and/or N (as generally believed) but also by C, owing to the unique physicochemical characteristics that prevail in typical karst regions. Additionally, submerged macrophytes have been found to inhibit phytoplankton growth. Further analysis showed that the proportion of Cyanobacteria over Chlorophyta and Bacillariophyta throughout the year was reduced at dissolved carbon dioxide/total nitrogen (CO2/TN) ratios (>0.2) and dissolved carbon dioxide/total phosphorus (CO2/TP) ratios (>10) in this study. Isotopic evidence further indicated that the abundance of Cyanobacteria was reduced when CO2 >30 mu mol/L. In summary, the combined results suggest that when controlling N and P, CO2 fertilization may significantly affect both the growth and composition of phytoplankton communities/submerged macrophytes and carbon sequestration in karst surface water ecosystems. This implies a new "paradigm" in the mitigation of cyanobacteria blooms by adding more CO2 to aquatic ecosystems with low pCO2, during which carbon sequestration may also be enhanced.