Permafrost thaw causes large carbon loss in boreal peatlands while changes to peat quality are limited.
boreal peatlands
carbon stocks
climate change
peat decomposition
peat incubation
permafrost thaw
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
10 2023
10 2023
Historique:
received:
24
04
2023
accepted:
16
06
2023
medline:
7
9
2023
pubmed:
11
8
2023
entrez:
11
8
2023
Statut:
ppublish
Résumé
Rapid, ongoing permafrost thaw of peatlands in the discontinuous permafrost zone is exposing a globally significant store of soil carbon (C) to microbial processes. Mineralization and release of this peat C to the atmosphere as greenhouse gases is a potentially important feedback to climate change. Here we investigated the effects of permafrost thaw on peat C at a peatland complex in western Canada. We collected 15 complete peat cores (between 2.7 and 4.5 m deep) along four chronosequences, from elevated permafrost peat plateaus to saturated thermokarst bogs that thawed up to 600 years ago. The peat cores were analysed for peat C storage and peat quality, as indicated by decomposition proxies (FTIR and C/N ratios) and potential decomposability using a 200-day aerobic laboratory incubation. Our results suggest net C loss following thaw, with average total peat C stocks decreasing by ~19.3 ± 7.2 kg C m
Substances chimiques
Soil
0
Carbon
7440-44-0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
5720-5735Subventions
Organisme : Campus Alberta Innovates Program
Organisme : NSERC Discovery
Informations de copyright
© 2023 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
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