The role of height-driven constraints and compensations on tree vulnerability to drought.
drought vulnerability
functional adjustments
hydraulic limitations
structural adjustments
tree height
tree size
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
09 2023
09 2023
Historique:
received:
13
03
2023
accepted:
07
06
2023
medline:
18
8
2023
pubmed:
24
7
2023
entrez:
24
7
2023
Statut:
ppublish
Résumé
Frequent observations of higher mortality in larger trees than in smaller ones during droughts have sparked an increasing interest in size-dependent drought-induced mortality. However, the underlying physiological mechanisms are not well understood, with height-associated hydraulic constraints often being implied as the potential mechanism driving increased drought vulnerability. We performed a quantitative synthesis on how key traits that drive plant water and carbon economy change with tree height within species and assessed the implications that the different constraints and compensations may have on the interacting mechanisms (hydraulic failure, carbon starvation and/or biotic-agent attacks) affecting tree vulnerability to drought. While xylem tension increases with tree height, taller trees present a range of structural and functional adjustments, including more efficient water use and transport and greater water uptake and storage capacity, that mitigate the path-length-associated drop in water potential. These adaptations allow taller trees to withstand episodic water stress. Conclusive evidence for height-dependent increased vulnerability to hydraulic failure and carbon starvation, and their coupling to defence mechanisms and pest and pathogen dynamics, is still lacking. Further research is needed, particularly at the intraspecific level, to ascertain the specific conditions and thresholds above which height hinders tree survival under drought.
Substances chimiques
Carbon
7440-44-0
Types de publication
Journal Article
Review
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2083-2098Subventions
Organisme : National Science Foundation
Informations de copyright
© 2023 The Authors New Phytologist © 2023 New Phytologist Foundation.
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