High peatland methane emissions following permafrost thaw: enhanced acetoclastic methanogenesis during early successional stages

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Abstract 4) emissions, but the underlying controls responsible for increased emissions and the duration for which they persist have yet to be fully elucidated. We assessed how shifting environmental conditions affect microbial communities and the magnitude and stable isotopic signature (δ 13 4 emissions along a thermokarst bog transect in boreal western Canada. Thermokarst bogs develop following permafrost thaw when dry, elevated peat plateaus collapse and become saturated and dominated by Sphagnum ∼ ∼ δ 13 4 surface emissions and dissolved gas depth profiles show that hydrogenotrophic methanogenesis was the dominant pathway at both sites. However, mean δ 13 4 signatures of both dissolved gas profiles and surface CH4 emissions were found to be isotopically heavier in the young bog (- - - - 4 emissions of 82 mg CH4  m- 2 - 1 ∼ 4  m- 2 - 1 4 emissions in young thermokarst bogs but that these favourable conditions only persist for the initial decades after permafrost thaw.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: High peatland methane emissions following permafrost thaw: enhanced acetoclastic methanogenesis during early successional stages ; volume:19 ; number:12 ; year:2022 ; pages:3051-3071 ; extent:21
Biogeosciences ; 19, Heft 12 (2022), 3051-3071 (gesamt 21)

Creator: Heffernan, Liam
Cavaco, Maria A.
Bhatia, Maya P.
Estop-Aragonés, Cristian
Knorr, Klaus-Holger
Olefeldt, David

DOI: 10.5194/bg-19-3051-2022

URN: urn:nbn:de:101:1-2022063005240686168050

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:24 AM CEST

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Heffernan, Liam
Cavaco, Maria A.
Bhatia, Maya P.
Estop-Aragonés, Cristian
Knorr, Klaus-Holger
Olefeldt, David

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