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Land use and topography influences on wildfire occurrence in northern Portugal
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Orientador(es)
Resumo(s)
Understanding the spatial patterns of wildfire ignition and spread has important implications for landscape
planning for reducing fire hazard. In this paper we characterise the patterns of wildfire occurrence
in 3 regions of northern Portugal, using selection ratio functions to evaluate the fire proneness of different
land cover and topographic categories. For attaining this objective we characterised 1382 wildfires
larger than 5 ha, which occurred in the years 1990–1991, according to land cover (10 categories), slope
(5 categories) and aspect (5 categories) within which they occurred. For each fire, the use of the different
land cover and topographic categories was compared with availability in a surrounding buffer. For
land cover, fire proneness was much higher in shrublands, whereas agricultural areas and agro-forestry
systems where less likely to burn. In terms of slope, steep slopes were more prone to fire. Differences in
land cover in the different slope categories contributed to this result, although there was an overall slope
effect on the fire proneness of all land cover types. In terms of aspect, only flat areas were less fire prone.
Finally, there were regional variations in land cover susceptibility to fire, but these did not occur for slope
or aspect. In terms of landscape planning these results suggest that the more effective fuel breaks should
be implemented in areas with agricultural crops in flat slopes
Descrição
Palavras-chave
selection patterns landscape management fire risk Mediterranean
Contexto Educativo
Citação
Landscape and Urban Planning 100 (2011) 169–176