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Boreal forest soil carbon fluxes one year after a wildfire: Effects of burn severity and management

Julia Kelly, Theresa S. Ibáñez, Cristina Santin Nuno, Stefan Doerr Orcid Logo, Marie‐Charlotte Nilsson, Thomas Holst, Anders Lindroth, Natascha Kljun Orcid Logo

Global Change Biology, Volume: 27, Issue: 17, Pages: 4181 - 4195

Swansea University Authors: Cristina Santin Nuno, Stefan Doerr Orcid Logo, Natascha Kljun Orcid Logo

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DOI (Published version): 10.1111/gcb.15721

Abstract

The extreme 2018 hot drought that affected central and northern Europe led to the worst wildfire season in Sweden in over a century. The Ljusdal fire complex, the largest area burnt that year (8995 ha), offered a rare opportunity to quantify the combined impacts of wildfire and post-fire management...

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Published in: Global Change Biology
ISSN: 1354-1013 1365-2486
Published: Wiley 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57161
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Abstract: The extreme 2018 hot drought that affected central and northern Europe led to the worst wildfire season in Sweden in over a century. The Ljusdal fire complex, the largest area burnt that year (8995 ha), offered a rare opportunity to quantify the combined impacts of wildfire and post-fire management on Scandinavian boreal forests. We present chamber measurements of soil CO2 and CH4 fluxes, soil microclimate and nutrient content from five Pinus sylvestris sites for the first growing season after the fire. We analysed the effects of three factors on forest soils: burn severity, salvage-logging and stand age. None of these caused significant differences in soil CH4 uptake. Soil respiration, however, declined significantly after a high-severity fire (complete tree mortality) but not after a low-severity fire (no tree mortality), despite substantial losses of the organic layer. Tree root respiration is thus key in determining post-fire soil CO2 emissions and may benefit, along with heterotrophic respiration, from the nutrient pulse after a low-severity fire. Salvage-logging after a high-severity fire had no significant effects on soil carbon fluxes, microclimate or nutrient content compared with leaving the dead trees standing, although differences are expected to emerge in the long term. In contrast, the impact of stand age was substantial: a young burnt stand experienced more extreme microclimate, lower soil nutrient supply and significantly lower soil respiration than a mature burnt stand, due to a thinner organic layer and the decade-long effects of a previous clear-cut and soil scarification. Disturbance history and burn severity are, therefore, important factors for predicting changes in the boreal forest carbon sink after wildfires. The presented short-term effects and ongoing monitoring will provide essential information for sustainable management strategies in response to the increasing risk of wildfire.
Keywords: 2018 drought; boreal forest; carbon fluxes; climate change; compound disturbance; forest fire; forest floor; harvesting; salvage-logging
College: Faculty of Science and Engineering
Funders: Swedish Strategic Research Area BECC, Biodiversity and Ecosystem Services in a Changing Climate. Grant Number: 2018 Crafoordska Stiftelsen. Grant Number: 20190763 Ramon y Cajal. Grant Number: RYC2018-025797-I Swedish Research Council Formas. Grant Numbers: 2018-02700, 2019-00836
Issue: 17
Start Page: 4181
End Page: 4195