Vegetation-derived pyrogenic carbon degradation and stabilisation in UK peatlands†
Oscar J. Kennedy-Blundell A B * , Emma L. Shuttleworth A , James J. Rothwell A and Gareth D. Clay A
+ Author Affiliations
- Author Affiliations
A Geography, School of Environment, Education and Development, Arthur Lewis Building, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
B Present address: Geography, University of Exeter, Amory Building, Rennes Drive, Exeter, EX4 4RJ, UK.
* Correspondence to: o.j.kennedy-blundell@exeter.ac.uk
International Journal of Wildland Fire 32(8) 1187-1199 https://doi.org/10.1071/WF22166
Submitted: 19 July 2022 Accepted: 5 May 2023 Published: 20 July 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF.
Abstract
Background: Strongly varying timescales of pyrogenic carbon (PyC) degradation have been observed across depositional settings. To date, PyC degradation in UK peatlands has had limited investigation.
Aims: This study aims to evaluate how PyC recalcitrance relates to differing production characteristics, fuels and duration of exposure in UK peatlands.
Methods: PyC samples produced from key peatland vegetation types were exposed on a peatland surface to assess molecular (by Fourier-transform infrared), leachable carbon (water-extractable organic carbon) and elemental (C, H, N, O) changes occurring over a year.
Key results: PyC degradation phases were observed: (1) very rapid (≤1 month) loss of leachable carbon; (2) longer-term (1–12 months) changes to PyC characteristics indicative of soil interactions. ‘Severity’ had a significant effect on all measured variables.
Conclusions: This study indicates that PyC is susceptible to changes within short timescales in UK peatlands, particularly low-temperature PyC, but that stabilisation through soil matrix interactions may occur over longer periods (>1 year).
Implications: The findings indicate that UK peatland wildfire carbon cycling research should consider early pulses of carbon to the wider environment, as well as longer-term C storage in PyC.
Keywords: burn severity, carbon, degradation, ecosystems: temperate, fuel, peatland, pyrogenic carbon, scale: local.
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