Large porewater exchange reshapes saltmarsh carbon and greenhouse gas budgets on local and global scales

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外文摘要：Saltmarshes are carbon-rich ecosystems that play a role in climate regulation by efficiently sequestrating atmospheric CO2.Climate change is a major threat to saltmarshes and will impact saltmarsh carbon sequestration.Notably,porewater-derived carbon outwelling emerges as a crucial pathway for carbon sequestration,but it has been largely overlooked in saltmarshes.Here,we assessed the drivers of dissolved carbon exports and greenhouse gas emissions in a saltmarsh and placed those observations into a global context.In our study site,porewater exchange(PEX)was the major process controlling dissolved carbon and greenhouse gas dynamics.Combining our results with 33 other studies in saltmarshes worldwide,porewater-derived carbon fluxes were equivalent to～48％of average global saltmarsh primary productivity and 2.2 times greater than global organic carbon burial.Hence,our local observations and global upscaling demonstrate the major role played by PEX in saltmarsh carbon budgets.While part of dissolved inorganic carbon returns to the atmosphere as CO2,the remaining bicarbonate fraction is stored in the ocean over long time scales.Our findings strengthen global blue carbon assessments and build arguments for the use of saltmarshes as nature-based solutions for global climate change.

外文关键词：

Coastal carbonGlobal carbon budgetCarbon neutralityNature-based solutionsCoastal wetlandsSubmarine groundwater discharge

作者：

Xiaogang CHEN、Isaac R.SANTOS、Lucheng ZHAN、Yu Yan YAU、Yan ZHANG、Ling LI

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作者单位：

Key Laboratory of Coastal Environment and Resources of Zhejiang Province,School of Engineering,Westlake University,Hangzhou 310024,China

Department of Marine Sciences,University of Gothenburg,Gothenburg 41319,Sweden

College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,China

基金：

National Natural Science Foundation of ChinaZhejiang Provincial Natural Science Foundation of ChinaSwedish Research Council

项目编号：

42006152LQ21D0600052020-00457

出版年：

2024

DOI：

10.1007/s11430-023-1305-6

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

年,卷(期)：2024.67(7)