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Title: The role of height–driven constraints and compensations on tree vulnerability to drought

Abstract

Summary 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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Ecological and Forestry Applications Research Center (CREAF), Catalonia (Spain); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Ecological and Forestry Applications Research Center (CREAF), Catalonia (Spain); Univ. Autonoma de Barcelona (Spain)
  3. Ecological and Forestry Applications Research Center (CREAF), Catalonia (Spain); Univ. Autonoma de Barcelona (Spain). Inst. Catalana de Recerca i Estudis Avancats (ICREA)
  4. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Washington State Univ., Pullman, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Spanish Ministry of Science and Innovation (MICINN)
OSTI Identifier:
1998062
Alternate Identifier(s):
OSTI ID: 1995551
Report Number(s):
PNNL-SA-189694
Journal ID: ISSN 0028-646X
Grant/Contract Number:  
AC05-76RL01830; CGL2017-89149-C2-1-R; RTI2018-095297-J-I00
Resource Type:
Accepted Manuscript
Journal Name:
New Phytologist
Additional Journal Information:
Journal Volume: 239; Journal Issue: 6; Journal ID: ISSN 0028-646X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; drought vulnerability; functional adjustments; hydraulic limitations; structural adjustments; tree height; tree size

Citation Formats

Fernández‐de‐Uña, Laura, Martínez‐Vilalta, Jordi, Poyatos, Rafael, Mencuccini, Maurizio, and McDowell, Nate G. The role of height–driven constraints and compensations on tree vulnerability to drought. United States: N. p., 2023. Web. doi:10.1111/nph.19130.
Fernández‐de‐Uña, Laura, Martínez‐Vilalta, Jordi, Poyatos, Rafael, Mencuccini, Maurizio, & McDowell, Nate G. The role of height–driven constraints and compensations on tree vulnerability to drought. United States. https://doi.org/10.1111/nph.19130
Fernández‐de‐Uña, Laura, Martínez‐Vilalta, Jordi, Poyatos, Rafael, Mencuccini, Maurizio, and McDowell, Nate G. Sun . "The role of height–driven constraints and compensations on tree vulnerability to drought". United States. https://doi.org/10.1111/nph.19130.
@article{osti_1998062,
title = {The role of height–driven constraints and compensations on tree vulnerability to drought},
author = {Fernández‐de‐Uña, Laura and Martínez‐Vilalta, Jordi and Poyatos, Rafael and Mencuccini, Maurizio and McDowell, Nate G.},
abstractNote = {Summary 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.},
doi = {10.1111/nph.19130},
journal = {New Phytologist},
number = 6,
volume = 239,
place = {United States},
year = {Sun Jul 23 00:00:00 EDT 2023},
month = {Sun Jul 23 00:00:00 EDT 2023}
}

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