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.
| Language | English |
|---|---|
| Article number | 4368 |
| Pages | 1-9 |
| Number of pages | 9 |
| Journal | Scientific Reports |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 13 Mar 2019 |
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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
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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 journal › Article › Research › peer-review
TY - JOUR
T1 - Blue carbon potential of coastal wetland restoration varies with inundation and rainfall
AU - Negandhi,Karita
AU - Edwards,Grant
AU - Kelleway,Jeffrey J.
AU - Howard,Dean
AU - Safari,David
AU - Saintilan,Neil
N1 - 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.
PY - 2019/3/13
Y1 - 2019/3/13
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85062837817&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/LP140100460
U2 - 10.1038/s41598-019-40763-8
DO - 10.1038/s41598-019-40763-8
M3 - Article
VL - 9
SP - 1
EP - 9
JO - Scientific Reports
T2 - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 4368
ER -