Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland
Abstract
Abstract Peatland degradation due to human activities is contributing to rising atmospheric CO 2 levels. Restoring the carbon (C) sink function in degraded peatlands and preventing further stored C losses is a key climate mitigation strategy, given the global scale of peatland disturbance. Active restoration involving a combination of rewetting and vegetation reestablishment at a post‐extraction peatland in Canada has been shown to successfully re‐establish net CO 2 uptake rates similar to undisturbed peatlands within a decade or two. However, lower than expected CH 4 emissions suggest recovery of belowground C cycling processes may lag behind the recovery of the surface net flux. Using closed chamber measurements over a warm season, we determined that restored Sphagnum , which covers two thirds of the site, was a null source of CH 4 . Emissions from the restored site were primarily attributed to vascular plant substrate inputs, measured as acetate, and plant‐mediated transport. The C isotopic fractionation factor for CH 4 and CO 2 in the pore water from the restored former peat field suggested reduced hydrogenotrophic CH 4 production deeper in the cutover peat profile (0.8 m depth). In contrast, isotopic fractionation in the former drainage ditches showed a balance of acetoclasticmore »
- Authors:
-
[1];
[1];
[2];
[3];
[5]
- Department of Natural Resource Sciences McGill University Ste‐Anne‐de‐Bellevue Quebec Canada
- Department of Geography and Environmental Management University of Waterloo Waterloo Ontario Canada
- Department of Geography McGill University Montreal Quebec Canada
- Department of Physical Geography and Ecosystem Science Lund University Lund Sweden
- Department of Oceanography Florida State University Tallahassee FL USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1836629
- Alternate Identifier(s):
- OSTI ID: 1997061
- Resource Type:
- Published Article
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Name: Journal of Geophysical Research. Biogeosciences Journal Volume: 126 Journal Issue: 12; Journal ID: ISSN 2169-8953
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Nugent, Kelly A., Strachan, Ian B., Strack, Maria, Roulet, Nigel T., Ström, Lena, and Chanton, Jeffrey P. Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland. United States: N. p., 2021.
Web. doi:10.1029/2020JG005909.
Nugent, Kelly A., Strachan, Ian B., Strack, Maria, Roulet, Nigel T., Ström, Lena, & Chanton, Jeffrey P. Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland. United States. https://doi.org/10.1029/2020JG005909
Nugent, Kelly A., Strachan, Ian B., Strack, Maria, Roulet, Nigel T., Ström, Lena, and Chanton, Jeffrey P. Mon .
"Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland". United States. https://doi.org/10.1029/2020JG005909.
@article{osti_1836629,
title = {Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland},
author = {Nugent, Kelly A. and Strachan, Ian B. and Strack, Maria and Roulet, Nigel T. and Ström, Lena and Chanton, Jeffrey P.},
abstractNote = {Abstract Peatland degradation due to human activities is contributing to rising atmospheric CO 2 levels. Restoring the carbon (C) sink function in degraded peatlands and preventing further stored C losses is a key climate mitigation strategy, given the global scale of peatland disturbance. Active restoration involving a combination of rewetting and vegetation reestablishment at a post‐extraction peatland in Canada has been shown to successfully re‐establish net CO 2 uptake rates similar to undisturbed peatlands within a decade or two. However, lower than expected CH 4 emissions suggest recovery of belowground C cycling processes may lag behind the recovery of the surface net flux. Using closed chamber measurements over a warm season, we determined that restored Sphagnum , which covers two thirds of the site, was a null source of CH 4 . Emissions from the restored site were primarily attributed to vascular plant substrate inputs, measured as acetate, and plant‐mediated transport. The C isotopic fractionation factor for CH 4 and CO 2 in the pore water from the restored former peat field suggested reduced hydrogenotrophic CH 4 production deeper in the cutover peat profile (0.8 m depth). In contrast, isotopic fractionation in the former drainage ditches showed a balance of acetoclastic and hydrogenotrophic methanogenesis deeper in the profile, indicative of some bulk peat C turnover. This study suggests that the legacy of substrate quality in the cutover peat can reduce the climate warming impact of newly restored peatlands through a reduction in CH 4 production and thus emission.},
doi = {10.1029/2020JG005909},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 12,
volume = 126,
place = {United States},
year = {Mon Dec 20 00:00:00 EST 2021},
month = {Mon Dec 20 00:00:00 EST 2021}
}
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