Exploring the role of plant hydraulics in canopy fuel moisture content: insights from an experimental drought study on Pinus halepensis Mill. and Quercus ilex L.
2024
Cakpo, Coffi, Belmys | Ruffault, Julien | Dupuy, Jean-Luc | Pimont, François | Doussan, Claude | Moreno, Myriam | Jean, Nathan | Jean, Frederic | Burlett, Régis | Delzon, Sylvain | Trueba, Santiago | Torres-Ruiz, José, M | Cochard, Hervé | Martin-Stpaul, Nicolas | Ecologie des Forêts Méditerranéennes (URFM) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH) ; Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Biodiversité, Gènes & Communautés (BioGeCo) ; Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant (PIAF) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Clermont Auvergne (UCA) | Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | J. R. received funding from the ECODIV Department of INRAE. With support from the US DoD Strategic Environmental Research and Development Program (SERDP), RC20-1025 Closing Gaps project, through Forest Service Agreement 20-IJ-11221637–178. We acknowledge the INRAE ACCAF metaprogram for its financial support of the project Drought & Fire.
International audience
اظهر المزيد [+] اقل [-]إنجليزي. Key Message: Understanding the impact of extreme drought on the canopy fuel moisture content (CFMC) is crucial to anticipate the effects of climate change on wildfires. Our study demonstrates that foliage mortality, caused by leaf embolism, can substantially diminish CFMC during drought on Pinus halepensis Mill. and Quercus ilex L. It emphasizes the importance of considering plant hydraulics to improve wildfire predictions. Context: Canopy fuel moisture content (CFMC), which represents the water-to-dry mass ratio in leaves and fine twigs within the canopy, is a major factor of fire danger across ecosystems worldwide. CFMC results from the fuel moisture content of living foliage (live fuel moisture content, LFMC) and dead foliage (dead fuel moisture content, DFMC) weighted by the proportion of foliage mortality in the canopy (α Dead). Understanding how LFMC, α Dead, and ultimately CFMC are affected during extreme drought is essential for effective wildfire planning. Aims: We aimed to understand how plant hydraulics affect CFMC for different levels of soil water deficit, examining its influence on both LFMC and α Dead. Methods: We conducted a drought experiment on seedlings of two Mediterranean species: Aleppo pine (Pinus halepensis Mill.) and Holm oak ( Quercus ilex L.). Throughout the drought experiment and after rewatering, we monitored CFMC, LFMC, and α Dead along with other ecophysiological variables. Results: LFMC exhibited a significant decrease during drought, and as leaf water potentials reached low levels, α Dead increased in both species, thereby reducing CFMC . Distinct water use strategies resulted in species-specific variations in dehydration dynamics. Conclusion: Our findings demonstrate that as drought conditions intensify, foliage mortality might become a critical physiological factor driving the decline in CFMC.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique