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Title: Tree water dynamics in a drying and warming world: Future tree water dynamics

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.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [2];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos NM 87545 USA
  2. Department of Biology, MSC03 202, University of New Mexico, Albuquerque NM 87131-0001 USA
  3. Fundación CEAM, Joint Research Unit University of Alicante - CEAM, Univ. Alicante, PO Box 99 03080 Alicante Spain
  4. Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland WA 99352 USA
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1406690
Report Number(s):
PNNL-SA-129758
Journal ID: ISSN 0140-7791
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plant, Cell and Environment; Journal Volume: 40; Journal Issue: 9
Country of Publication:
United States
Language:
English

Citation Formats

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, and McDowell, Nate G.. Tree water dynamics in a drying and warming world: Future tree water dynamics. United States: N. p., 2017. Web. doi:10.1111/pce.12991.
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.. Tree water dynamics in a drying and warming world: Future tree water dynamics. United States. doi:10.1111/pce.12991.
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, and McDowell, Nate G.. Tue . "Tree water dynamics in a drying and warming world: Future tree water dynamics". United States. doi:10.1111/pce.12991.
@article{osti_1406690,
title = {Tree water dynamics in a drying and warming world: Future tree water dynamics},
author = {Grossiord, Charlotte and Sevanto, Sanna and Borrego, Isaac and Chan, Allison M. and Collins, Adam D. and Dickman, Lee T. and Hudson, Patrick J. and McBranch, Natalie and Michaletz, Sean T. and Pockman, William T. and Ryan, Max and Vilagrosa, Alberto and McDowell, Nate G.},
abstractNote = {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.},
doi = {10.1111/pce.12991},
journal = {Plant, Cell and Environment},
number = 9,
volume = 40,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}