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Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions

文献类型：期刊论文

作者Zhang, Peipei1,2; Jiao, Ruyuan3,4; Gong, Chen1,2; Wang, Fang1; Yan, Weijin1; Li, Qingqian1; Wang, Dongsheng3,4
刊名JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期2022-11-01
卷号121页码:98-111
ISSN号1001-0742
关键词Ecosystem metabolism DOC turnover CO2 emission rate Source partitioning of CO2 emissions delta C-13(DIC)
DOI10.1016/j.jes.2021.09.020
通讯作者Yan, Weijin(yanwj@igsnrr.ac.cn)
英文摘要Dam reservoirs in headwater catchments, as critical zones for their proximity to terrestrial sources, play important roles in dissolved organic carbon (DOC) cycling. However, the effects of ecosystem metabolism (EM) on DOC cycling are not well known. Here, in-situ diurnal and monthly observations were conducted to measure EM (including gross primary production (GPP), ecosystem respiration (ER) and heterotrophic respiration (HR)), DOC turnover and CO2 emissions in a headwater catchment reservoir in Southeastern China in 2020. Our study showed the nocturnal CO2 emission rate was about twice as high as in daytime, and was strongly driven by EM. The values for DOC turnover velocity ranged from 0.10 to 1.59 m/day, and the average DOC turnover rate was 0.13 day(-1), with the average removal efficiency of 12%. The contribution of respired DOC to daily CO2 emissions ranged from 17 to 61%. The accumulated efficiencies were estimated to be 13% for the selected 15 reservoirs throughout the Changjiang River network, corresponding to about 0.34 Tg C/year of the respired DOC. The modified CO2 flux was 0.75 Tg C/year, and respired DOC accounted for about 45% of total emitted CO2 from the 15 larger reservoirs. Our research emphasizes the necessity of incorporating the effects of EM into studies of reservoir DOC removal and CO2 emissions. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
WOS关键词RESIDENCE TIME ; GAS-EXCHANGE ; WIND-SPEED ; RIVER ; FLOW ; DIOXIDE ; FLUXES ; LAKES ; DOC
资助项目National Natural Science Foundation of China[42077304] ; National Natural Science Foundation of China[41877483] ; National Natural Science Foundation of China[41371454]
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者SCIENCE PRESS
WOS记录号WOS:000800545000011
资助机构National Natural Science Foundation of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/178476]  
专题中国科学院地理科学与资源研究所
通讯作者Yan, Weijin
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Yangtze River Delta Branch, Yiwu 322000, Zhejiang, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Peipei,Jiao, Ruyuan,Gong, Chen,et al. Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2022,121:98-111.
APA Zhang, Peipei.,Jiao, Ruyuan.,Gong, Chen.,Wang, Fang.,Yan, Weijin.,...&Wang, Dongsheng.(2022).Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions.JOURNAL OF ENVIRONMENTAL SCIENCES,121,98-111.
MLA Zhang, Peipei,et al."Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions".JOURNAL OF ENVIRONMENTAL SCIENCES 121(2022):98-111.

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来源：地理科学与资源研究所

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