EGU2020-2914, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-2914
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Role of vegetation on fire behaviour in Fennoscandia forests during the Holocene

Chiara Molinari1, Richard H.W. Bradshaw2, Christopher Carcaillet3,4, Gina Hannon2, and Veiko Lehsten1,5
Chiara Molinari et al.
  • 1Department of Physical Geography and Ecosystem Science, Lund University, Sweden (chiara.molinari@nateko.lu.se)
  • 2School of Environmental Sciences, University of Liverpool, Liverpool, UK
  • 3PSL Research University, École Pratique des Hautes Études (EPHE), Paris, France
  • 4Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (Université Claude Bernard Lyon 1, CNRS, ENTPE), UMR 5023, Villeurbanne, France
  • 5Department of Macroecology and Landscape Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland

The relationship between Holocene changes in Fennoscandia biomass burning (reconstructed by means of sedimentary charcoal records from lake and peat bogs) and main forest composition (based on pollen reconstructions from the same sites) divided into three different fire sensitivity classes is explored based on the hypothesis that fire-prone species are more abundant during periods characterized by higher fire disturbance, while fire-intolerant species dominate when biomass burning is low.

The overall patterns found across Fennoscandia suggest that there was low but increasing fire activity during the early Holocene, while a low and decreasing trend characterized the middle Holocene. During the late Holocene biomass burning increased, with a peak around 500 cal yr BP. This maximum is then followed by a downturn during the last centuries.

Generally, fire-prone species are strongly positively correlated with multi-millennial variability of biomass burning in Fennoscandia forests. A positive - but much weaker - relationship also exists between fire-tolerant species and long-term fire trends. On the contrary, a quite strong negative correlation is detected between biomass burning and fire-intolerant species.

The results presented in this large-scale analysis demonstrate that biomass burning was highly linked to fuel type (according to different fire sensitivity classes) during the Holocene, underlying the fact that all past fire-climate studies must consider key functional interactions between fuel type and long-term changes in fire regime.

How to cite: Molinari, C., Bradshaw, R. H. W., Carcaillet, C., Hannon, G., and Lehsten, V.: Role of vegetation on fire behaviour in Fennoscandia forests during the Holocene, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-2914, https://doi.org/10.5194/egusphere-egu2020-2914, 2020

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