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Article << Previous     |     Next >>   Contents Vol 13(1)

Statistical analysis of fire frequency models for Catalonia (NE Spain), 1975–1998) based on fire scar maps from Landsat MSS data

Ricardo Díaz-Delgado A D, Francisco Lloret A B, Xavier Pons A C

A CREAF, Facultat de Ciències, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
B email: francisco.lloret@uab.es
C Departament de Geografia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain. email: xavier.pons@uab.es
D Corresponding author. Present address: Estación Biológica de Doñana, Avda María Luisa s/n., 41013 Sevilla, Spain. Telephone: +34 5 423 2340, ext. 119; fax: +34 5 462 1125; email: rdiaz@ebd.csic.es
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This paper estimates fire frequency in Catalonia (NE Spain) for the last quarter of the 20th Century (1975–1998) from historical burned area maps. Remote sensing images provided perimeters of fires ≥ 30 ha, which were used to characterize the temporal patterns of fire occurrence in Catalonia. Several fire frequency models were used to reproduce the observed pattern of wildfires occurrence in the study period. Natural fire rotation period was estimated to be 133 years. Poisson tests were carried out to check random fire occurrence either along the time period or across the analysed region. Observed fires were not randomly generated either in space or in time, despite being sampled using two different plot sizes. This sampling design was also used for Mean Fire Interval (MFI) analysis, which allowed us to significantly fit a Weibull distribution to the observed proportion of fire intervals (for both sample sizes), enabling us to estimate the hazard of burning, mortality, and survivorship functions. Finally, MFI was also applied to forest regions of Catalonia, which are defined according to forest management plans based on their homogeneous climatic conditions. Such an analysis revealed relevant differences in forest management and their consequences on fire occurrence.

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