Prolonged experimental drought reduces plant hydraulic conductance and transpiration and increases mortality in a piñon–juniper woodland
Abstract
Abstract Plant hydraulic conductance ( k s ) is a critical control on whole‐plant water use and carbon uptake and, during drought, influences whether plants survive or die. To assess long‐term physiological and hydraulic responses of mature trees to water availability, we manipulated ecosystem‐scale water availability from 2007 to 2013 in a piñon pine ( Pinus edulis ) and juniper ( Juniperus monosperma ) woodland. We examined the relationship between k s and subsequent mortality using more than 5 years of physiological observations, and the subsequent impact of reduced hydraulic function and mortality on total woody canopy transpiration ( E C ) and conductance ( G C ). For both species, we observed significant reductions in plant transpiration ( E ) and k s under experimentally imposed drought. Conversely, supplemental water additions increased E and k s in both species. Interestingly, both species exhibited similar declines in k s under the imposed drought conditions, despite their differing stomatal responses and mortality patterns during drought. Reduced whole‐plant k s also reduced carbon assimilation in both species, as leaf‐level stomatal conductance ( g s ) and net photosynthesis ( A n ) declined strongly with decreasing k s . Finally, we observed thatmore »
- Authors:
-
- Department of Biology MSC03 2020 1 University of New Mexico Albuquerque New Mexico 87131‐0001
- Centre d'Ecologie Fonctionnelle et Evolutive CEFE UMR5175 CNRS Université de Montpellier Université Paul‐Valéry Montpellier EPHE 1919 Route de Mende Montpellier Cedex 5 34293 France
- Departamento de Ciencias del Agua y del Medio Ambiente Instituto Tecnológico de Sonora Ciudad Obregón Sonora 85000 Mexico
- Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico 87545
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1295966
- Alternate Identifier(s):
- OSTI ID: 1212470; OSTI ID: 1295967
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Published Article
- Journal Name:
- Ecology and Evolution
- Additional Journal Information:
- Journal Name: Ecology and Evolution Journal Volume: 5 Journal Issue: 8; Journal ID: ISSN 2045-7758
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; canopy dieback; climate change; hydraulic failure; net carbon assimilation; plant water stress; precipitation manipulation; stomatal response to drought; tree death
Citation Formats
Pangle, Robert E., Limousin, Jean‐Marc, Plaut, Jennifer A., Yepez, Enrico A., Hudson, Patrick J., Boutz, Amanda L., Gehres, Nathan, Pockman, William T., and McDowell, Nate G. Prolonged experimental drought reduces plant hydraulic conductance and transpiration and increases mortality in a piñon–juniper woodland. United Kingdom: N. p., 2015.
Web. doi:10.1002/ece3.1422.
Pangle, Robert E., Limousin, Jean‐Marc, Plaut, Jennifer A., Yepez, Enrico A., Hudson, Patrick J., Boutz, Amanda L., Gehres, Nathan, Pockman, William T., & McDowell, Nate G. Prolonged experimental drought reduces plant hydraulic conductance and transpiration and increases mortality in a piñon–juniper woodland. United Kingdom. https://doi.org/10.1002/ece3.1422
Pangle, Robert E., Limousin, Jean‐Marc, Plaut, Jennifer A., Yepez, Enrico A., Hudson, Patrick J., Boutz, Amanda L., Gehres, Nathan, Pockman, William T., and McDowell, Nate G. Mon .
"Prolonged experimental drought reduces plant hydraulic conductance and transpiration and increases mortality in a piñon–juniper woodland". United Kingdom. https://doi.org/10.1002/ece3.1422.
@article{osti_1295966,
title = {Prolonged experimental drought reduces plant hydraulic conductance and transpiration and increases mortality in a piñon–juniper woodland},
author = {Pangle, Robert E. and Limousin, Jean‐Marc and Plaut, Jennifer A. and Yepez, Enrico A. and Hudson, Patrick J. and Boutz, Amanda L. and Gehres, Nathan and Pockman, William T. and McDowell, Nate G.},
abstractNote = {Abstract Plant hydraulic conductance ( k s ) is a critical control on whole‐plant water use and carbon uptake and, during drought, influences whether plants survive or die. To assess long‐term physiological and hydraulic responses of mature trees to water availability, we manipulated ecosystem‐scale water availability from 2007 to 2013 in a piñon pine ( Pinus edulis ) and juniper ( Juniperus monosperma ) woodland. We examined the relationship between k s and subsequent mortality using more than 5 years of physiological observations, and the subsequent impact of reduced hydraulic function and mortality on total woody canopy transpiration ( E C ) and conductance ( G C ). For both species, we observed significant reductions in plant transpiration ( E ) and k s under experimentally imposed drought. Conversely, supplemental water additions increased E and k s in both species. Interestingly, both species exhibited similar declines in k s under the imposed drought conditions, despite their differing stomatal responses and mortality patterns during drought. Reduced whole‐plant k s also reduced carbon assimilation in both species, as leaf‐level stomatal conductance ( g s ) and net photosynthesis ( A n ) declined strongly with decreasing k s . Finally, we observed that chronically low whole‐plant k s was associated with greater canopy dieback and mortality for both piñon and juniper and that subsequent reductions in woody canopy biomass due to mortality had a significant impact on both daily and annual canopy E C and G C . Our data indicate that significant reductions in k s precede drought‐related tree mortality events in this system, and the consequence is a significant reduction in canopy gas exchange and carbon fixation. Our results suggest that reductions in productivity and woody plant cover in piñon–juniper woodlands can be expected due to reduced plant hydraulic conductance and increased mortality of both piñon pine and juniper under anticipated future conditions of more frequent and persistent regional drought in the southwestern United States.},
doi = {10.1002/ece3.1422},
journal = {Ecology and Evolution},
number = 8,
volume = 5,
place = {United Kingdom},
year = {Mon Mar 23 00:00:00 EDT 2015},
month = {Mon Mar 23 00:00:00 EDT 2015}
}
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