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

Molinari, Chiara (author)
Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,LUCCI - Lund Centre for Studies of Carbon Cycle and Climate Interaction,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
Lehsten, Veiko (author)
Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science,Swiss Federal Institute for Forest, Snow and Landscape Research
Blarquez, Olivier (author)
University Of Quebec In Montreal
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Carcaillet, Christopher (author)
Claude Bernard University Lyon 1,École Pratiques des Hautes Ètudes, Paris
Davis, Basil A.S. (author)
University of Lausanne
Kaplan, Jed O. (author)
ARVE Research SARL
Clear, Jennifer (author)
Liverpool Hope University
Bradshaw, Richard (author)
University of Liverpool
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 (creator_code:org_t)
2018-07-20
2018
English.
In: Global Change Biology. - : Wiley. - 1365-2486 .- 1354-1013. ; 24:10, s. 4929-4945
  • Journal article (peer-reviewed)
Abstract Subject headings
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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 evergreentrees in Alaska and in central and southern Fennoscandia). Land use playedonly 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.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)

Keyword

biomass burning
boreal biome
climate variations
Holocene
land use
plant functional types

Publication and Content Type

art (subject category)
ref (subject category)

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