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Variation of drought sensitivity traits over ontogenetic stages and ecological types in French Guyana wet tropical forest

Titre :	Variation of drought sensitivity traits over ontogenetic stages and ecological types in French Guyana wet tropical forest Ajouter au panier
Auteur(s) :	Clément Thion, Auteur (et co-auteur) Sabrina Coste, Responsable de stage Clément Stahl, Responsable de stage Université de Guyane, Etablissement de soutenance
Type de document :	Mémoire
Filière :	M. : BEE -- Biodiversité Ecologie Evolution (comprend les parcours BIOGET et EFT )
Sujets :	Mortalité ; Arbre ; Forêt tropicale humide ; Guyane française ; Sécheresse ; Chaleur
Résumé :	Extrait de l’introduction : […] Tree mortality induced by thermal stress and hydraulic stress involves different physiological mechanisms, and affect each other, so that global drought induced mortality of trees is a complex ecophysiological process to understand (Doughty et al. 2015; N. McDowell et al. 2008;Adams et al. 2017) […] Our study intends to compare drought sensitivity of different ecological types (lianas,understory specialist, canopy tree), regarding both hydraulic sensitivity traits (P12, P50,HSM, Ptlp, see table 1) and thermal sensitivity traits (Tcrit, T50, TSM, see table 1), and the articulation between both. Using the same traits, we also addressed the effect of ontogeny, by comparing drought sensitivity of adult canopy trees with juveniles of the same species. W[...] Extrait de l’introduction : […] Tree mortality induced by thermal stress and hydraulic stress involves different physiological mechanisms, and affect each other, so that global drought induced mortality of trees is a complex ecophysiological process to understand (Doughty et al. 2015; N. McDowell et al. 2008;Adams et al. 2017) […] Our study intends to compare drought sensitivity of different ecological types (lianas,understory specialist, canopy tree), regarding both hydraulic sensitivity traits (P12, P50,HSM, Ptlp, see table 1) and thermal sensitivity traits (Tcrit, T50, TSM, see table 1), and the articulation between both. Using the same traits, we also addressed the effect of ontogeny, by comparing drought sensitivity of adult canopy trees with juveniles of the same species. We hypothesize differences in sensitivities between adult canopy trees and the rest of ecological types, as they experience very different environmental constraints due to temperature and light vertical gradients. Thus, we expect TSM of canopy tree species to be smaller than TSMof understory specialists. Concerning lianas, we hypothesize that both their hydraulic and thermal sensitivity are lower than trees (canopy and understory specialist), as lianas aresuspected to be more adapted to drought conditions (Schnitzer 2018; Schnitzer, Kuzee, and Bongers 2005). Finally, we tried to mechanistically explain hydraulic sensitivity and thermal sensitivity with various morphological traits […]
Date de publication :	2024
Format :	50 p. / ill. coul., graph.coul., tabl. n&b., photo coul.
Langue(s) :	Anglais
Lien vers la notice :	https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=222644