Influence of combined hydric and thermal stresses on Rosmarinus officinalis and Cistus albidus
Résumé
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.
Mots clés
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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Origine : Publication financée par une institution
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification