How terpene content affects fuel flammability of wildland–urban interface vegetation
Bastien Romero A , Catherine Fernandez B , Caroline Lecareux B , Elena Ormeño B and Anne Ganteaume A C
+ Author Affiliations
- Author Affiliations
A Institut national de Recherche en Sciences et Technologie pour l’Environnement et l’Agriculture (IRSTEA), Recover-Mediterranean Ecosystems and Risks, 3275 route de Cézanne, CS 40061, 13182 Aix-en-Provence cedex 5, France.
B Aix Marseille Université, Institut Méditerranéen de Biodiversité et d’Ecologie, (UMR 7263 CNRS–IRD–Université d’Avignon et des pays de Vaucluse), Centre Saint-Charles – Case 4, 3 place Victor Hugo, 13331 Marseille Cedex 03, France.
C Corresponding author. Email: anne.ganteaume@irstea.fr
International Journal of Wildland Fire 28(8) 614-627 https://doi.org/10.1071/WF18210
Submitted: 22 May 2018 Accepted: 13 June 2019 Published: 17 July 2019
Abstract
Among plant characteristics promoting flammability, terpenes have received little attention, especially regarding the vegetation surrounding housing. Here, mono-, sesqui- and diterpenes were screened in live and dead leaves of ornamental species found in wildland–urban interfaces (WUIs) of south-eastern France. Terpene content and composition were compared among species and between fuel types. Their influence on flammability was assessed through several variables and compared with that of leaf thickness and moisture content. Six of the 17 species examined contained terpenes. Terpene diversity and content differed among species but not between fuel types. Mono-, sesqui- and diterpenes (especially the highly concentrated compounds) were involved to varying degrees in both leaf and litter flammability. Their effects could be opposite according to the flammability variable and the fuel type considered. Leaf sesquiterpene content and litter total terpene content had the strongest influence on maximum combustion temperature; the former also mainly drove leaf flaming duration. The other flammability variables were more strongly associated with either moisture content or leaf thickness. Our findings highlight the idea that fire management in the WUI must also acknowledge the potential for ornamental species containing terpenes, such as Pinus halepensis, to affect fire behaviour.
Additional keywords: fire prevention, fire-prone species, leaf traits, ornamental vegetation, Pinus halepensis, volatile organic compounds.
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