Climate and functional traits jointly mediate tree water-use strategies.

Autor: Flo V; CREAF, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain.; Univ Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain., Martínez-Vilalta J; CREAF, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain.; Univ Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain., Mencuccini M; CREAF, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain.; ICREA, Barcelona, 08010, Spain., Granda V; CREAF, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain., Anderegg WRL; School of Biological Sciences, University of Utah, Salt Lake City, UT, 84112, USA., Poyatos R; CREAF, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain.; Univ Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Catalonia, 08193, Spain.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2021 Jul; Vol. 231 (2), pp. 617-630. Date of Electronic Publication: 2021 May 21.
DOI: 10.1111/nph.17404
Abstrakt: Tree water use is central to plant function and ecosystem fluxes. However, it is still unknown how organ-level water-relations traits are coordinated to determine whole-tree water-use strategies in response to drought, and whether this coordination depends on climate. Here we used a global sap flow database (SAPFLUXNET) to study the response of water use, in terms of whole-tree canopy conductance (G), to vapour pressure deficit (VPD) and to soil water content (SWC) for 142 tree species. We investigated the individual and coordinated effect of six water-relations traits (vulnerability to embolism, Huber value, hydraulic conductivity, turgor-loss point, rooting depth and leaf size) on water-use parameters, also accounting for the effect of tree height and climate (mean annual precipitation, MAP). Reference G and its sensitivity to VPD were tightly coordinated with water-relations traits rather than with MAP. Species with efficient xylem transport had higher canopy conductance but also higher sensitivity to VPD. Moreover, we found that angiosperms had higher reference G and higher sensitivity to VPD than did gymnosperms. Our results highlight the need to consider trait integration and reveal the complications and challenges of defining a single, whole-plant resource use spectrum ranging from 'acquisitive' to 'conservative'.
(© 2021 The Authors New Phytologist © 2021 New Phytologist Foundation.)
Databáze: MEDLINE
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