Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland

Nugent, Kelly A.; Strachan, Ian B.; Strack, Maria; Roulet, Nigel T.; Ström, Lena; Chanton, Jeffrey P.

doi:10.1029/2020JG005909

Title: Cutover Peat Limits Methane Production Causing Low Emission at a Restored Peatland

Journal Article · 20 December 2021 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1029/2020JG005909 · OSTI ID:1836629

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^[3]; Ström, Lena ^[4];

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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

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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1836629

Journal Information:: Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 12 Vol. 126; ISSN 2169-8953

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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