Cross-regional modelling of fire occurrence in the Alps and the Mediterranean Basin
İsmail Bekar A F , Çağatay Tavşanoğlu B , G. Boris Pezzatti C , Harald Vacik D , Juli G. Pausas E , Harald Bugmann A and Gunnar Petter AA Forest Ecology, Institute of Terrestrial Ecosystems, Swiss Federal Institute of Technology, ETH Zurich, Universitätstrasse 16, 8092 Zürich, Switzerland.
B Division of Ecology, Department of Biology, Hacettepe University, Beytepe 06800, Ankara, Turkey.
C Insubric Ecosystems Research Group, Swiss Federal Research Institute for forest, snow and landscape research WSL, Campus Cadenazzo, A Ramel 18, 6593 Cadenazzo, Switzerland.
D Institute of Silviculture, University of Natural Resources and Life Sciences (BOKU), Peter Jordan Str. 82, 1190 Vienna, Austria.
E Centro de Investigaciones sobre Desertificación, Consejo Superior de Investigaciones Científicas (CIDE-CSIC), 46113 Valencia, Spain.
F Corresponding author. Email: ibekar@ethz.ch
International Journal of Wildland Fire 29(8) 712-722 https://doi.org/10.1071/WF19158
Submitted: 1 October 2019 Accepted: 9 March 2020 Published: 6 April 2020
Abstract
In recent decades, changes in fire activity have been observed in Europe. Fires can have large consequences for the provisioning of ecosystem services and for human well-being. Therefore, understanding the drivers of fire occurrence and improving the predictive capability of fire occurrence models is of utmost importance. So far, most studies have focused on individual regions with rather low spatial resolution, and have lacked the ability to apply the models in different regions. Here, a species distribution modelling approach (Maxent) was used to model fire occurrence in four regions across the Mediterranean Basin and the Alps using several environmental variables at two spatial resolutions. Additionally, a cross-regional model was developed and spatial transferability tested. Most models showed good performance, with fine resolution models always featuring somewhat higher performance than coarse resolution models. When transferred across regions, the performance of regional models was good only under similar environmental conditions. The cross-regional model showed a higher performance than the regional models in the transfer tests. The results suggest that a cross-regional approach is most robust when aiming to use fire occurrence models at the regional scale but beyond current environmental conditions, for example in scenario analyses of the impacts of climate change.
Additional keywords: fire ignition, grain size, Maxent, spatial resolution, species distribution model.
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