%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Ruffault, J.
%A Limousin, J. M.
%A Pimont, F.
%A Dupuy, J. L.
%A De Caceres, M.
%A Cochard, H.
%A Mouillot, Florent
%A Blackman, C. J.
%A Torres-Ruiz, J. M.
%A Parsons, R. A.
%A Moreno, M.
%A Delzon, S.
%A Jansen, S.
%A Olioso, A.
%A Choat, B.
%A Martin-StPaul, N.
%T Plant hydraulic modelling of leaf and canopy fuel moisture content reveals increasing vulnerability of a Mediterranean forest to wildfires under extreme drought
%D 2023
%L fdi:010086688
%G ENG
%J New Phytologist
%@ 0028-646X
%K climate change ; drought ; forest flammability ; live fuel moisture ; content ; plant hydraulics ; process-based modelling ; tree mortality ; wildfire
%K FRANCE ; ZONE MEDITERRANEENNE
%M ISI:000894671500001
%P [14 ]
%R 10.1111/nph.18614
%U https://www.documentation.ird.fr/hor/fdi:010086688
%> https://www.documentation.ird.fr/intranet/publi/2023-01/010086688.pdf
%V [Early access]
%W Horizon (IRD)
%X Fuel moisture content (FMC) is a crucial driver of forest fires in many regions world-wide. Yet, the dynamics of FMC in forest canopies as well as their physiological and environmental determinants remain poorly understood, especially under extreme drought.We embedded a FMC module in the trait-based, plant-hydraulic SurEau-Ecos model to provide innovative process-based predictions of leaf live fuel moisture content (LFMC) and canopy fuel moisture content (CFMC) based on leaf water potential (psi Leaf$$ {\psi}_{\mathrm{Leaf}} $$). SurEau-Ecos-FMC relies on pressure-volume (p-v) curves to simulate LFMC and vulnerability curves to cavitation to simulate foliage mortality.SurEau-Ecos-FMC accurately reproduced psi Leaf$$ {\psi}_{\mathrm{Leaf}} $$ and LFMC dynamics as well as the occurrence of foliage mortality in a Mediterranean Quercus ilex forest. Several traits related to water use (leaf area index, available soil water, and transpiration regulation), vulnerability to cavitation, and p-v curves (full turgor osmotic potential) had the greatest influence on LFMC and CFMC dynamics. As the climate gets drier, our results showed that drought-induced foliage mortality is expected to increase, thereby significantly decreasing CFMC.Our results represent an important advance in our capacity to understand and predict the sensitivity of forests to wildfires.
%$ 072 ; 076 ; 021