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Blue carbon potential of coastal wetland restoration varies with inundation and rainfall

There is a growing interest in how the management of ‘blue carbon’ sequestered by coastal wetlands can influence global greenhouse gas (GHG) budgets. A promising intervention is through restoring tidal exchange to impounded coastal wetlands for reduced methane (CH(4)) emissions. We monitored an impo...

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Autores principales: Negandhi, Karita, Edwards, Grant, Kelleway, Jeffrey J., Howard, Dean, Safari, David, Saintilan, Neil
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6416304/
https://www.ncbi.nlm.nih.gov/pubmed/30867475
http://dx.doi.org/10.1038/s41598-019-40763-8
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author Negandhi, Karita
Edwards, Grant
Kelleway, Jeffrey J.
Howard, Dean
Safari, David
Saintilan, Neil
author_facet Negandhi, Karita
Edwards, Grant
Kelleway, Jeffrey J.
Howard, Dean
Safari, David
Saintilan, Neil
author_sort Negandhi, Karita
collection PubMed
description There is a growing interest in how the management of ‘blue carbon’ sequestered by coastal wetlands can influence global greenhouse gas (GHG) budgets. A promising intervention is through restoring tidal exchange to impounded coastal wetlands for reduced methane (CH(4)) emissions. We monitored an impounded wetland’s GHG flux (CO(2) and CH(4)) prior to and following tidal reinstatement. We found that biogeochemical responses varied across an elevation gradient. The low elevation zone experienced a greater increase in water level and an associated greater marine transition in the sediment microbial community (16 S rRNA) than the high elevation zone. The low elevation zone’s GHG emissions had a reduced sustained global warming potential of 264 g m(−2) yr(−1) CO(2)-e over 100 years, and it increased to 351 g m(−2) yr(−1) with the removal of extreme rain events. However, emission benefits were achieved through a reduction in CO(2) emissions, not CH(4) emissions. Overall, the wetland shifted from a prior CH(4) sink (−0.07 to −1.74 g C m(−2) yr(−1)) to a variable sink or source depending on the elevation site and rainfall. This highlights the need to consider a wetland’s initial GHG emissions, elevation and future rainfall trends when assessing the efficacy of tidal reinstatement for GHG emission control.
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spelling pubmed-64163042019-03-15 Blue carbon potential of coastal wetland restoration varies with inundation and rainfall Negandhi, Karita Edwards, Grant Kelleway, Jeffrey J. Howard, Dean Safari, David Saintilan, Neil Sci Rep Article There is a growing interest in how the management of ‘blue carbon’ sequestered by coastal wetlands can influence global greenhouse gas (GHG) budgets. A promising intervention is through restoring tidal exchange to impounded coastal wetlands for reduced methane (CH(4)) emissions. We monitored an impounded wetland’s GHG flux (CO(2) and CH(4)) prior to and following tidal reinstatement. We found that biogeochemical responses varied across an elevation gradient. The low elevation zone experienced a greater increase in water level and an associated greater marine transition in the sediment microbial community (16 S rRNA) than the high elevation zone. The low elevation zone’s GHG emissions had a reduced sustained global warming potential of 264 g m(−2) yr(−1) CO(2)-e over 100 years, and it increased to 351 g m(−2) yr(−1) with the removal of extreme rain events. However, emission benefits were achieved through a reduction in CO(2) emissions, not CH(4) emissions. Overall, the wetland shifted from a prior CH(4) sink (−0.07 to −1.74 g C m(−2) yr(−1)) to a variable sink or source depending on the elevation site and rainfall. This highlights the need to consider a wetland’s initial GHG emissions, elevation and future rainfall trends when assessing the efficacy of tidal reinstatement for GHG emission control. Nature Publishing Group UK 2019-03-13 /pmc/articles/PMC6416304/ /pubmed/30867475 http://dx.doi.org/10.1038/s41598-019-40763-8 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Negandhi, Karita
Edwards, Grant
Kelleway, Jeffrey J.
Howard, Dean
Safari, David
Saintilan, Neil
Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title_full Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title_fullStr Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title_full_unstemmed Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title_short Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
title_sort blue carbon potential of coastal wetland restoration varies with inundation and rainfall
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6416304/
https://www.ncbi.nlm.nih.gov/pubmed/30867475
http://dx.doi.org/10.1038/s41598-019-40763-8
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