文献类型：期刊文献

英文题名：Porewater-Derived Blue Carbon Outwelling and Greenhouse Gas Emissions in a Subtropical Multi-Species Saltmarsh

作者：Zhu, Peiyuan[1] Chen, Xiaogang[1,2] Zhang, Yan[1] Zhang, Qianyu[3] Wu, Xuan[1] Zhao, Huawen[1] Qi, Liang[1] Shao, Xuexin[4] Li, Ling[1]

第一作者：Zhu, Peiyuan

通信作者：Chen, XG[1];Li, L[1];Chen, XG[2]

机构：[1]Westlake Univ, Sch Engn, Key Lab Coastal Environm & Resources Zhejiang Prov, Hangzhou, Peoples R China;[2]Westlake Inst Adv Study, Insititute Adv Technol, Hangzhou, Peoples R China;[3]Washington State Univ, Dept Civil & Environm Engn, Pullman, WA USA;[4]Chinese Acad Forestry, Res Inst Subtrop Forestry, Wetland Ecosyst Res Stn Hangzhou Bay, Hangzhou, Peoples R China

年份：2022

卷号：9

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：;Scopus(收录号：2-s2.0-85130564159);WOS:【SCI-EXPANDED(收录号:WOS:000797868900001)】；

基金：This research was supported by the Zhejiang Provincial Natural Science Foundation of China (LQ21D060005), Natural Science Foundation of China (42006152) and China Postdoctoral Science Foundation (2020M681931).

语种：英文

外文关键词：saltmarsh biodiversity; carbon sequestration; coastal blue carbon; lateral carbon exports; carbon budget; C3 and C4 plant species; carbon isotope delta C-13; Hangzhou Bay

摘要：Saltmarshes can sequester atmospheric CO2 in sediments, but limited studies have quantified porewater-derived carbon exports and identified related carbon sources. Here, we estimated porewater exchange, carbon outwelling, and greenhouse gas emissions in a subtropical multi-species saltmarsh. The radon-based porewater exchange rate was estimated to be 5.60 +/- 2.78 cm d(-1). As the most dominant (~90%) carbon species, dissolved inorganic carbon (DIC) fluxes through porewater exchange and outwelling were 447 +/- 227 and 1200 +/- 61 mmol m(-2) d(-1), respectively, which were 1.2 and 3.2 times that of carbon burial. As most DIC can remain in the ocean for a long time, porewater-derived DIC outwelling represents another important carbon sink, in addition to carbon burial. CO2 and CH4 emissions from creek water were 54.6 +/- 0.5 and 0.19 +/- 0.01 mmol m(-2) d(-1), respectively, which could offset 16% of carbon burial. The delta C-13 and C/N ratios suggest that saltmarsh organic carbon mainly originates from the C3 plant Scirpus mariqueter rather than the C4 plant Spartina alterniflora. Overall, we suggest that porewater-derived DIC outwelling is an important long-term carbon sink in multi-species saltmarshes, providing a scientific basis for the protection and restoration of saltmarshes in the context of global climate change.