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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 (Open Access)

Influence of combined hydric and thermal stresses on Rosmarinus officinalis and Cistus albidus

Rawaa Jamaladdeen A , Bruno Coudour A * , Fabienne Dédaldéchamp B , Laurent Lemée https://orcid.org/0000-0001-9520-3289 C , Florence Thibault B , Jean-Pierre Garo A and Hui-Ying Wang A
+ Author Affiliations
- Author Affiliations

A Institut P’ - UPR 3346 CNRS, ENSMA, University of Poitiers, Chasseneuil, France. Email: rawaa.jamaladdeen@ensma.fr, jean-pierre.garo@ensma.fr, hui-ying.wang@ensma.fr

B EBI - UMR CNRS 7267, Ecologie et Biologie des Interactions, University of Poitiers, Poitiers, France. Email: fabienne.dedaldechamp@univ-poitiers.fr

C IC2MP - UMR CNRS 7285, Institut de Chimie des Milieux et Matériaux de Poitiers, University of Poitiers, Poitiers Cedex, France. Email: laurent.lemee@univ-poitiers.fr

* Correspondence to: bruno.coudour@ensma.fr

International Journal of Wildland Fire 32(6) 968-978 https://doi.org/10.1071/WF22146
Submitted: 6 July 2022  Accepted: 9 April 2023   Published: 9 May 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Background: Wildfires are a growing threat, especially in Mediterranean climate areas during periods of drought. The wildfire research community continues to investigate propagation mechanisms considering thermal transfer and fluid mechanics and sometimes a simplified chemistry taking into account the main combustion products such as CO, CO2, H2O, H2 and CH4. However, volatile organic compounds (VOCs) cannot be neglected and have a major role in vegetation ignition. Despite this, knowledge on the influence of wildfire on plant emissions remains lacking.

Aims: This work addresses the effect of combined hydric and thermal stresses on the physiology and emissions of Rosmarinus officinalis and Cistus albidus, which are widely consumed in Mediterranean wildfires.

Methods: Plants were submitted to hydric stress inside a greenhouse, then to thermal stress inside a heated hermetic enclosure while collecting emissions with adsorbent elements for analysis. Simultaneously, heating experiments were carried out with leaves sampled to analyse their emissions.

Key results: The heating tests showed significant variations in monoterpene, fatty acid and alkane emissions between stressed and unstressed plants with different results between Rosmarinus officinalis and Cistus albidus.

Conclusion/implication: Further experiments with other plant species and quantification of emissions may help to better know why Mediterranean wildfires are a particular threat and how to improve firefighting methods.

Keywords: alkanes, chlorophyll, combined hydric and thermal stresses, fatty acids, hydrocarbons, leaf and plant emissions, microscopy, physiology analyses, plant heating, Py-GC-MS, radiant panel, Rosmarinus officinalis, Cistus albidus, solid-phase extraction elements (SPEE), TD-GC-MS, terpenes, thermodesorption, water content.


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