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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Likelihood and frequency of recurrent fire ignitions in highly urbanised Mediterranean landscapes

Mario Elia A C , Vincenzo Giannico A , Giuseppina Spano A , Raffaele Lafortezza A B and Giovanni Sanesi A
+ Author Affiliations
- Author Affiliations

A Department of Agricultural and Environmental Sciences, University of Bari A. Moro, Via Amendola 165/A, 70126 Bari, Italy.

B Department of Geography, The University of Hong Kong, Centennial Campus, Pokfulam Road, Hong Kong.

C Corresponding author. Email: mario.elia@uniba.it

International Journal of Wildland Fire 29(2) 120-131 https://doi.org/10.1071/WF19070
Submitted: 8 May 2019  Accepted: 26 November 2019   Published: 16 January 2020

Abstract

Fire recurrence plays a key role in shaping landscapes in Mediterranean ecosystems. Short-term recurrent fires, in particular, are increasingly affecting highly urbanised landscapes. Studies worldwide have addressed fire recurrence by analysing environmental, climatic and human-driven factors. Current models use fire recurrence polygons as the dependent variable; yet no published study has focused its analysis on fire recurrence considering recurrent ignition points as the response variable. To fill this gap, remote sensing and available local data were combined to analyse the influence of human and biophysical variables in predicting both the likelihood and frequency of recurrent fire ignition points over a 9-year period (2004–12) in southern Italy. For this purpose, we used the Negative Binomial Hurdle model owing to the stochastic nature of the phenomenon of fire recurrence and the (large) number of non-occurrences. Results on the likelihood and frequency of recurrent fire ignition points (dependent variables) suggested that road distance was the strongest predictor, followed by the presence of shrublands and grasslands. The response variable showed a negative relationship with population density and road distance and a positive relationship with land-cover variables. Vegetation indices were also good predictors of fire recurrence. More broadly, this study is intended to be a further experimental step in fire-management analysis characterised by the continuous interaction between human and natural systems. Constant changes between these systems due to causes such as urban sprawl and climate change can create the conditions for short-term-interval recurrent fires.

Additional keywords: fire drivers, fire ignition points, fire recurrence, hurdle models, remote sensing.


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