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Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways

Ping Yang Orcid Logo, Derrick Y.F. Lai Orcid Logo, Hong Yang, Yongxin Lin Orcid Logo, Chuan Tong, Yan Hong, Yalan Tian, Chen Tang, Kam Tang Orcid Logo

Water Research, Volume: 222, Start page: 118882

Swansea University Author: Kam Tang Orcid Logo

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DOI (Published version): 10.1016/j.watres.2022.118882

Abstract

Reclamation of coastal wetlands for aquaculture use has been shown to have opposite effects on sediment CH4 production potential and CH4 emission flux, but the underlying reason remained unclear. In this study, we compared sediment properties, CH4 production potential, emission flux, and CH4 transpo...

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Published in: Water Research
ISSN: 0043-1354
Published: Elsevier BV 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60534
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spelling v2 60534 2022-07-19 Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways 69af43a3b9da24aef65c5d3a44956fe3 0000-0001-9427-9564 Kam Tang Kam Tang true false 2022-07-19 BGPS Reclamation of coastal wetlands for aquaculture use has been shown to have opposite effects on sediment CH4 production potential and CH4 emission flux, but the underlying reason remained unclear. In this study, we compared sediment properties, CH4 production potential, emission flux, and CH4 transport pathways between a brackish marsh and the nearby reclaimed aquaculture ponds in the Min River Estuary in southeastern China. Despite that the sediment CH4 production potential in the ponds was significantly lower than the marsh, CH4 emission flux in the ponds (17.4 ± 2.7 mg m-2 h-1) was 11.9 times higher than the marsh (1.3 ± 0.2 mg m-2 h-1). Plant-mediated transport accounted for 75% of the total CH4 emission in the marsh, whereas ebullition accounted for 95% of the total CH4 emission in the ponds. CH4 emission flux in both habitat types was highest in the summer. These results suggest that the increase in CH4 emission following the conversion of brackish marsh to aquaculture ponds was not caused by increased sediment CH4 production, but rather by eliminating rhizospheric oxidation and shifting the major transport pathway to ebullition, allowing sediment CH4 to bypass oxidative loss. This study improves our understanding of the impacts of modification of coastal wetlands on greenhouse gas dynamics. Journal Article Water Research 222 118882 Elsevier BV 0043-1354 Methane (CH4) production; CH4 emission; Gas transport pathway; Coastal wetland; Aquaculture ponds 15 8 2022 2022-08-15 10.1016/j.watres.2022.118882 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University Not Required 2024-07-12T16:04:52.8104018 2022-07-19T13:36:46.4467965 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences Ping Yang 0000-0002-5212-6065 1 Derrick Y.F. Lai 0000-0002-1225-9904 2 Hong Yang 3 Yongxin Lin 0000-0002-0305-5766 4 Chuan Tong 5 Yan Hong 6 Yalan Tian 7 Chen Tang 8 Kam Tang 0000-0001-9427-9564 9 60534__24639__f38be1acfbc549ed963d6fb521f9c0d2.pdf WaterResearch_authorsfinal.pdf 2022-07-19T13:40:12.7574662 Output 2697394 application/pdf Accepted Manuscript true 2023-07-20T00:00:00.0000000 ©2022 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng https://creativecommons.org/licenses/by-nc-nd/4.0/
title Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
spellingShingle Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
Kam Tang
title_short Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
title_full Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
title_fullStr Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
title_full_unstemmed Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
title_sort Large increase in CH4 emission following conversion of coastal marsh to aquaculture ponds caused by changing gas transport pathways
author_id_str_mv 69af43a3b9da24aef65c5d3a44956fe3
author_id_fullname_str_mv 69af43a3b9da24aef65c5d3a44956fe3_***_Kam Tang
author Kam Tang
author2 Ping Yang
Derrick Y.F. Lai
Hong Yang
Yongxin Lin
Chuan Tong
Yan Hong
Yalan Tian
Chen Tang
Kam Tang
format Journal article
container_title Water Research
container_volume 222
container_start_page 118882
publishDate 2022
institution Swansea University
issn 0043-1354
doi_str_mv 10.1016/j.watres.2022.118882
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Reclamation of coastal wetlands for aquaculture use has been shown to have opposite effects on sediment CH4 production potential and CH4 emission flux, but the underlying reason remained unclear. In this study, we compared sediment properties, CH4 production potential, emission flux, and CH4 transport pathways between a brackish marsh and the nearby reclaimed aquaculture ponds in the Min River Estuary in southeastern China. Despite that the sediment CH4 production potential in the ponds was significantly lower than the marsh, CH4 emission flux in the ponds (17.4 ± 2.7 mg m-2 h-1) was 11.9 times higher than the marsh (1.3 ± 0.2 mg m-2 h-1). Plant-mediated transport accounted for 75% of the total CH4 emission in the marsh, whereas ebullition accounted for 95% of the total CH4 emission in the ponds. CH4 emission flux in both habitat types was highest in the summer. These results suggest that the increase in CH4 emission following the conversion of brackish marsh to aquaculture ponds was not caused by increased sediment CH4 production, but rather by eliminating rhizospheric oxidation and shifting the major transport pathway to ebullition, allowing sediment CH4 to bypass oxidative loss. This study improves our understanding of the impacts of modification of coastal wetlands on greenhouse gas dynamics.
published_date 2022-08-15T16:04:51Z
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