The climate, the fuel and the land use: long-term regional variability of biomass burning in boreal forests

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The influence of different drivers on changes in North American and European boreal forests biomass burning (BB) during the Holocene was investigated based on the following hypotheses: land use was important only in the southernmost regions, while elsewhere climate was the main driver modulated by changes in fuel type. BB was reconstructed by means of 88 sedimentary charcoal records divided into six different site clusters. A statistical approach was used to explore the relative contribution of (a) pollen‐based mean July/summer temperature and mean annual precipitation reconstructions, (b) an independent model‐based scenario of past land use (LU), and (c) pollen‐based reconstructions of plant functional types (PFTs) on BB. Our hypotheses were tested with: (a) a west‐east northern boreal sector with changing climatic conditions and a homogeneous vegetation, and (b) a north‐south European boreal sector characterized by gradual variation in both climate and vegetation composition. The processes driving BB in boreal forests varied from one region to another during the Holocene. However, general trends in boreal biomass burning were primarily controlled by changes in climate (mean annual precipitation in Alaska, northern Quebec, and northern Fennoscandia, and mean July/summer temperature in central Canada and central Fennoscandia) and, secondarily, by fuel composition (BB positively correlated with the presence of boreal needleleaf evergreen
trees in Alaska and in central and southern Fennoscandia). Land use played
only a marginal role. A modification towards less flammable tree species (by promoting deciduous stands over fire‐prone conifers) could contribute to reduce circumboreal wildfire risk in future warmer periods.


Enheter & grupper
Externa organisationer
  • Swiss Federal Institute for Forest, Snow and Landscape Research
  • University of Montreal, Canada
  • École Pratiques des Hautes Ètudes, Paris
  • Claude Bernard University Lyon 1
  • University of Lausanne
  • ARVE Research SARL
  • Liverpool Hope University
  • University of Liverpool

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Klimatforskning


Sidor (från-till)4929-4945
TidskriftGlobal Change Biology
Utgåva nummer10
StatusPublished - 2018 jan
Peer review utfördJa