Large Carbon Losses From Burned Permafrost Peatlands During Post‐Fire Succession

2025/10/07 by Christopher Schulze, Oliver Sonnentag, Craig A. Emmerton +10 · 1 voice
Environmental Science · #Peatlands and Wetlands Ecology #Fire effects on ecosystems #Coastal wetland ecosystem dynamics

paper · pdf · doi:10.1029/2025gl118344

Abstract

Abstract The carbon (C) storage of boreal peatlands is threatened by an intensifying wildfire regime. Between 2019 and 2023 we used eddy covariance and surface closed chambers to monitor two permafrost peatlands in boreal western Canada that burned in 2019 and 2007. Deeper thaw, warmer soils, and slow vegetation recovery caused the 2019 Burn to be a net carbon dioxide (CO 2 ) source (+130 g C m −2 yr −1 ) for four years post‐fire, despite reduced soil respiration. The 2007 Burn was a sink (−11 g C m −2 yr −1 ) 13–15 years post‐fire, similar to undisturbed peatlands. We estimate that wildfire caused a loss (∼2.9 kg C m −2 ) from permafrost peatlands, with ∼1.7 kg C m −2 due to combustion and ∼1.2 kg C m −2 due to net CO 2 losses during post‐fire succession. This highlights the importance of the post‐fire CO 2 losses and emphasizes the vulnerability of permafrost peatland soil C to fire.

Discussions

• So permafrost peatlands burn and they release lots of CO2 through combustion - but that's just the start. Christopher Schulze shows in a new GRL study that slow recovery causes continued CO2 losses in [bsky, 20 points, 1 comments]

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