Tree water dynamics in a drying and warming world

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Title: Tree water dynamics in a drying and warming world
Authors: Grossiord, Charlotte | Sevanto, Sanna | Borrego, Isaac | Chan, Allison M. | Collins, Adam D. | Dickman, Lee T. | Hudson, Patrick J. | McBranch, Natalie | Michaletz, Sean T. | Pockman, William T. | Ryan, Max | Vilagrosa, Alberto | McDowell, Nate G.
Center, Department or Service: Universidad de Alicante. Departamento de Ecología | CEAM (Centro Estudios Ambientales del Mediterráneo)
Keywords: Acclimation | Hydraulics | Juniperus monosperma | Megadrought | Pinus edulis | Sap flux | Stomatal conductance | Transpiration | Vapour pressure deficit | Xylem anatomy
Knowledge Area: Ecología
Issue Date: Sep-2017
Publisher: John Wiley & Sons
Citation: Plant, Cell and Environment. 2017, 40(9): 1861-1873. doi:10.1111/pce.12991
Abstract: Disentangling the relative impacts of precipitation reduction and vapour pressure deficit (VPD) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge. Here, we report sap flux density (FD), stomatal conductance (Gs), hydraulic conductivity (KL) and xylem anatomy in piñon pine (Pinus edulis) and juniper (Juniperus monosperma) trees subjected to five years of precipitation reduction, atmospheric warming (elevated VPD) and their combined effects. No acclimation occurred under precipitation reduction: lower Gs and FD were found for both species compared to ambient conditions. Warming reduced the sensibility of stomata to VPD for both species but resulted in the maintenance of Gs and FD to ambient levels only for piñon. For juniper, reduced soil moisture under warming negated benefits of stomatal adjustments and resulted in reduced FD, Gs and KL. Although reduced stomatal sensitivity to VPD also occurred under combined stresses, reductions in Gs, FD and KL took place to similar levels as under single stresses for both species. Our results show that stomatal conductance adjustments to high VPD could minimize but not entirely prevent additive effects of warming and drying on water use and carbon acquisition of trees in semi-arid regions.
Sponsor: The Los Alamos Survival-Mortality (SUMO) Experiment was funded by the US Department of Energy, Office of Science, Biological and Environmental Research. C.G. and S.M. were supported by a Director’s Fellowship from the Los Alamos National Laboratory. A.V. was supported by a fellowship from Generalitat Valenciana (BEST/2016/289) and the project Survive-2 (CGL2015-69773-C2-2-P MINECO/FEDER) from the Spanish Government. CEAM is funded by Generalitat Valenciana.
ISSN: 0140-7791 (Print) | 1365-3040 (Online)
DOI: 10.1111/pce.12991
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 John Wiley & Sons Ltd
Peer Review: si
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