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Title: Warming combined with more extreme precipitation regimes modifies the water sources used by trees

Abstract

Summary The persistence of vegetation under climate change will depend on a plant's capacity to exploit water resources. We analyzed water source dynamics in piñon pine and juniper trees subjected to precipitation reduction, atmospheric warming, and to both simultaneously. Piñon and juniper exhibited different and opposite shifts in water uptake depth in response to experimental stress and background climate over 3 yr. During a dry summer, juniper responded to warming with a shift to shallow water sources, whereas piñon pine responded to precipitation reduction with a shift to deeper sources in autumn. In normal and wet summers, both species responded to precipitation reduction, but juniper increased deep water uptake and piñon increased shallow water uptake. Shifts in the utilization of water sources were associated with reduced stomatal conductance and photosynthesis, suggesting that belowground compensation in response to warming and water reduction did not alleviate stress impacts for gas exchange. We have demonstrated that predicted climate change could modify water sources of trees. Warming impairs juniper uptake of deep sources during extended dry periods. Precipitation reduction alters the uptake of shallow sources following extended droughts for piñon. Shifts in water sources may not compensate for climate change impacts on tree physiology.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of California, Berkeley CA (United States)
  3. Oklahoma State Univ., Stillwater OK (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1325653
Alternate Identifier(s):
OSTI ID: 1401017
Report Number(s):
LA-UR-16-24124
Journal ID: ISSN 0028-646X
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
New Phytologist
Additional Journal Information:
Journal Name: New Phytologist; Journal ID: ISSN 0028-646X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; Earth Sciences

Citation Formats

Grossiord, Charlotte, Sevanto, Sanna, Dawson, Todd E., Adams, Henry D., Collins, Adam D., Dickman, Lee T., Newman, Brent D., Stockton, Elizabeth A., and McDowell, Nate G. Warming combined with more extreme precipitation regimes modifies the water sources used by trees. United States: N. p., 2016. Web. doi:10.1111/nph.14192.
Grossiord, Charlotte, Sevanto, Sanna, Dawson, Todd E., Adams, Henry D., Collins, Adam D., Dickman, Lee T., Newman, Brent D., Stockton, Elizabeth A., & McDowell, Nate G. Warming combined with more extreme precipitation regimes modifies the water sources used by trees. United States. https://doi.org/10.1111/nph.14192
Grossiord, Charlotte, Sevanto, Sanna, Dawson, Todd E., Adams, Henry D., Collins, Adam D., Dickman, Lee T., Newman, Brent D., Stockton, Elizabeth A., and McDowell, Nate G. Fri . "Warming combined with more extreme precipitation regimes modifies the water sources used by trees". United States. https://doi.org/10.1111/nph.14192. https://www.osti.gov/servlets/purl/1325653.
@article{osti_1325653,
title = {Warming combined with more extreme precipitation regimes modifies the water sources used by trees},
author = {Grossiord, Charlotte and Sevanto, Sanna and Dawson, Todd E. and Adams, Henry D. and Collins, Adam D. and Dickman, Lee T. and Newman, Brent D. and Stockton, Elizabeth A. and McDowell, Nate G.},
abstractNote = {Summary The persistence of vegetation under climate change will depend on a plant's capacity to exploit water resources. We analyzed water source dynamics in piñon pine and juniper trees subjected to precipitation reduction, atmospheric warming, and to both simultaneously. Piñon and juniper exhibited different and opposite shifts in water uptake depth in response to experimental stress and background climate over 3 yr. During a dry summer, juniper responded to warming with a shift to shallow water sources, whereas piñon pine responded to precipitation reduction with a shift to deeper sources in autumn. In normal and wet summers, both species responded to precipitation reduction, but juniper increased deep water uptake and piñon increased shallow water uptake. Shifts in the utilization of water sources were associated with reduced stomatal conductance and photosynthesis, suggesting that belowground compensation in response to warming and water reduction did not alleviate stress impacts for gas exchange. We have demonstrated that predicted climate change could modify water sources of trees. Warming impairs juniper uptake of deep sources during extended dry periods. Precipitation reduction alters the uptake of shallow sources following extended droughts for piñon. Shifts in water sources may not compensate for climate change impacts on tree physiology.},
doi = {10.1111/nph.14192},
journal = {New Phytologist},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 09 00:00:00 EDT 2016},
month = {Fri Sep 09 00:00:00 EDT 2016}
}

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