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Volatile and semi-volatile terpenes impact leaf flammability: differences according to the level of terpene identification

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Abstract

In flammability assessment, the terpene effect is usually studied using their total or subgroup content, missing, therefore, the information that could be provided by the molecules themselves. In this study, the specific role of terpenes on leaf flammability was sought comparing different levels of terpene identification—total, subgroup (i.e. mono-, sesqui-, and diterpene), and single compound—as well as their interactions with fuel moisture content (FMC) in four species common in Mediterranean Wildland–Urban Interfaces (Pinus halepensis, Cupressocyparis leylandii, Hesperocyparis arizonica, Cupressus sempervirens). Pinus halepensis was the most flammable species (low FMC and higher sesquiterpene content but low terpene diversity) while Cupressocyparis leylandii presented the highest terpene diversity and total terpene content (higher mono- and diterpene content). Flammability was differently affected according to the terpene identification level used in the models. The effects ranged from non-significant for most species studied, using subgroup or total terpene content, to mostly significant, using single compound content. Regarding the former, the lack of significant results could be due to opposite effects of different single compounds within a terpene subgroup. For the latter, terpene molecules driving flammability and their effects (positive or negative) differed among species. A cumulative effect with FMC was also highlighted in some cases but terpenes mostly remained the main flammability drivers regardless of the species. Using the refined terpene level in modelling allowed a better understanding of the compounds’ role on flammability, which is useful in the identification of plant traits linked to flammability.

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Data for this manuscript are accessible at the Dryad Digital Repository.

Notes

  1. The terpene content is calculated averaging the content of the five replicates sampled per species.

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Acknowledgements

We gratefully thank Amélie Saunier from the Institut Méditerranéen de Biodiversité et d’Ecologie (IMBE) for her help in the chemical analyses as well as Fabien Guerra, Ugo Furet, Christian Travaglini and Denis Morges (Inrae) for their help during the burning experiments. The authors also sincerely thank Aimee MacCormack for English revision.

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  1. INRAE, RECOVER, Centre PACA, 3275 Route de Cézanne, 13182, Aix-en-Provence cedex 5, France

    Anne Ganteaume & Bastien Romero

  2. Aix-Marseille Université, Institut Méditerranéen de Biodiversité et d’Ecologie, (UMR 7263 CNRS- IRD- Université d’Avignon et des pays de Vaucluse), 3 place Victor Hugo, 13331, Marseille, France

    Catherine Fernandez, Elena Ormeño & Caroline Lecareux

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  1. Anne Ganteaume
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  2. Bastien Romero
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Correspondence to Anne Ganteaume.

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Communicated by Günther Raspotnig.

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Ganteaume, A., Romero, B., Fernandez, C. et al. Volatile and semi-volatile terpenes impact leaf flammability: differences according to the level of terpene identification. Chemoecology 31, 259–275 (2021). https://doi.org/10.1007/s00049-021-00349-1

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