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- Title
Climate warming and elevated CO<sub>2</sub> alter peatland soil carbon sources and stability.
- Authors
Ofiti, Nicholas O. E.; Schmidt, Michael W. I.; Abiven, Samuel; Hanson, Paul J.; Iversen, Colleen M.; Wilson, Rachel M.; Kostka, Joel E.; Wiesenberg, Guido L. B.; Malhotra, Avni
- Abstract
Peatlands are an important carbon (C) reservoir storing one-third of global soil organic carbon (SOC), but little is known about the fate of these C stocks under climate change. Here, we examine the impact of warming and elevated atmospheric CO2 concentration (eCO2) on the molecular composition of SOC to infer SOC sources (microbe-, plant- and fire-derived) and stability in a boreal peatland. We show that while warming alone decreased plant- and microbe-derived SOC due to enhanced decomposition, warming combined with eCO2 increased plant-derived SOC compounds. We further observed increasing root-derived inputs (suberin) and declining leaf/needle-derived inputs (cutin) into SOC under warming and eCO2. The decline in SOC compounds with warming and gains from new root-derived C under eCO2, suggest that warming and eCO2 may shift peatland C budget towards pools with faster turnover. Together, our results indicate that climate change may increase inputs and enhance decomposition of SOC potentially destabilising C storage in peatlands. No inherently stable peat soil carbon. Researchers found that all molecular components of peatland soil organic carbon responded to warming and eCO2, including the components presumed to be slow cycling and stable.
- Subjects
GLOBAL warming; CARBON in soils; PEAT soils; PEATLANDS; CLIMATE change
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-43410-z