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

Karita Negandhi, Grant Edwards, Jeffrey J. Kelleway, Dean Howard, David Safari, Neil Saintilan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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 (CH4 ) emissions. We monitored an impounded wetland’s GHG flux (CO2 and CH4 ) 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 CO2-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 CO2 emissions, not CH4 emissions. Overall, the wetland shifted from a prior CH4 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.

LanguageEnglish
Article number4368
Pages1-9
Number of pages9
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 13 Mar 2019

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Wetlands
Carbon
Gases
Global Warming
Rain
Methane
Budgets
Water

Bibliographical note

Copyright the Author(s) 2019. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Cite this

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. In: Scientific Reports. 2019 ; Vol. 9, No. 1. pp. 1-9.
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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.

In: Scientific Reports, Vol. 9, No. 1, 4368, 13.03.2019, p. 1-9.

Research output: Contribution to journalArticleResearchpeer-review

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