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Title: Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy

Abstract

Summary Models of forest energy, water and carbon cycles assume decreased stomatal conductance with elevated atmospheric CO 2 concentration ([CO 2 ]) based on leaf‐scale measurements, a response not directly translatable to canopies. Where canopy–atmosphere are well‐coupled, [CO 2 ]‐induced structural changes, such as increasing leaf‐area index ( L D ), may cause, or compensate for, reduced mean canopy stomatal conductance ( G S ), keeping transpiration ( E C ) and, hence, runoff unaltered. We investigated G S responses to increasing [CO 2 ] of conifer and broadleaved trees in a temperate forest subjected to 17‐yr free‐air CO 2 enrichment (FACE; + 200 μmol mol −1 ). During the final phase of the experiment, we employed step changes of [CO 2 ] in four elevated‐[CO 2 ] plots, separating direct response to changing [CO 2 ] in the leaf‐internal air‐space from indirect effects of slow changes via leaf hydraulic adjustments and canopy development. Short‐term manipulations caused no direct response up to 1.8 × ambient [CO 2 ], suggesting that the observed long‐term 21% reduction of G S was an indirect effect of decreased leaf hydraulic conductance and increased leaf shading. Thus, E C was unaffected by [CO 2 ] because 19% highermore » canopy L D nullified the effect of leaf hydraulic acclimation on G S . We advocate long‐term experiments of duration sufficient for slow responses to manifest, and modifying models predicting forest water, energy and carbon cycles accordingly.« less

Authors:
 [1];  [2];  [3];  [2];  [4];  [1]
+ Show Author Affiliations
  1. Duke Univ., Durham, NC (United States). Nicholas School of the Environment and Earth Sciences; North Carolina State Univ., Raleigh, NC (United States). Department of Forestry and Environmental Resources; Bordeaux Sciences AGRO, Gradignan Cedex (France)
  2. Duke Univ., Durham, NC (United States). Nicholas School of the Environment and Earth Sciences; Swedish University of Agricultural Sciences (SLU), Umeå (Sweden). Department of Forest Ecology and Management
  3. North Carolina State Univ., Raleigh, NC (United States). Department of Forestry and Environmental Resources
  4. Univ. of Oklahoma, Norman, OK (United States). Department of Microbiology and Plant Biology
Publication Date:
Research Org.:
Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1454930
Alternate Identifier(s):
OSTI ID: 1400675
Grant/Contract Number:  
SC0006967; SC-0006700-11-ER65189; DE‐SC0006967
Resource Type:
Accepted Manuscript
Journal Name:
New Phytologist
Additional Journal Information:
Journal Volume: 205; Journal Issue: 2; Journal ID: ISSN 0028-646X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; canopy stomatal conductance; elevated CO2; free-air CO2 enrichment (FACE); Liquidambar styraciflua; Pinus taeda; transpiration

Citation Formats

Tor-ngern, Pantana, Oren, Ram, Ward, Eric J., Palmroth, Sari, McCarthy, Heather R., and Domec, Jean-Christophe. Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy. United States: N. p., 2014. Web. doi:10.1111/nph.13148.
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Tor-ngern, Pantana, Oren, Ram, Ward, Eric J., Palmroth, Sari, McCarthy, Heather R., & Domec, Jean-Christophe. Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy. United States. https://doi.org/10.1111/nph.13148
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Tor-ngern, Pantana, Oren, Ram, Ward, Eric J., Palmroth, Sari, McCarthy, Heather R., and Domec, Jean-Christophe. Mon . "Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy". United States. https://doi.org/10.1111/nph.13148. https://www.osti.gov/servlets/purl/1454930.
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@article{osti_1454930,
title = {Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy},
author = {Tor-ngern, Pantana and Oren, Ram and Ward, Eric J. and Palmroth, Sari and McCarthy, Heather R. and Domec, Jean-Christophe},
abstractNote = {Summary Models of forest energy, water and carbon cycles assume decreased stomatal conductance with elevated atmospheric CO 2 concentration ([CO 2 ]) based on leaf‐scale measurements, a response not directly translatable to canopies. Where canopy–atmosphere are well‐coupled, [CO 2 ]‐induced structural changes, such as increasing leaf‐area index ( L D ), may cause, or compensate for, reduced mean canopy stomatal conductance ( G S ), keeping transpiration ( E C ) and, hence, runoff unaltered. We investigated G S responses to increasing [CO 2 ] of conifer and broadleaved trees in a temperate forest subjected to 17‐yr free‐air CO 2 enrichment (FACE; + 200 μmol mol −1 ). During the final phase of the experiment, we employed step changes of [CO 2 ] in four elevated‐[CO 2 ] plots, separating direct response to changing [CO 2 ] in the leaf‐internal air‐space from indirect effects of slow changes via leaf hydraulic adjustments and canopy development. Short‐term manipulations caused no direct response up to 1.8 × ambient [CO 2 ], suggesting that the observed long‐term 21% reduction of G S was an indirect effect of decreased leaf hydraulic conductance and increased leaf shading. Thus, E C was unaffected by [CO 2 ] because 19% higher canopy L D nullified the effect of leaf hydraulic acclimation on G S . We advocate long‐term experiments of duration sufficient for slow responses to manifest, and modifying models predicting forest water, energy and carbon cycles accordingly.},
doi = {10.1111/nph.13148},
journal = {New Phytologist},
number = 2,
volume = 205,
place = {United States},
year = {Mon Oct 27 00:00:00 EDT 2014},
month = {Mon Oct 27 00:00:00 EDT 2014}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1111/nph.13148
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Cited by: 52 works
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Figures / Tables:

Fig. 1 Fig. 1: Site conditions. (a) Soil moisture, expressed as relative extractable water (REW) in each of the eight plots (represented by different colors) and vapor pressure deficit (light gray) during the study period. (b) Atmospheric [CO2] in each plot during the study period. Ambient [CO2] in four reference plots aremore » shown in gray, while that of the four elevated-[CO2] plots are in color. During Indirect, elevated-[CO2] plots were all subjected to +200 μmol mol-1. During Direct, [CO2] in each plot was varied independently for a 5-d period to avoid confounding effects with REW. For example, in an elevated-[CO2] plot (orange line), [CO2] was decreased to ambient level during the first period, ramped up to +300 μmol mol-1 above ambient in the second period, reduced to +200, +100 μmol mol-1, and to ambient level once again, followed by periods of +300 μmol mol-1, +150 μmol mol-1 and finally to the ambient level in the last 5-d period of Direct phase, before returning to the long-term enhancement of +200 μmol mol-1.« less
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    Works referencing / citing this record:

    Disentangling the role of photosynthesis and stomatal conductance on rising forest water-use efficiency
    journal, August 2019

    • Guerrieri, Rossella; Belmecheri, Soumaya; Ollinger, Scott V.
    • Proceedings of the National Academy of Sciences, Vol. 116, Issue 34
    • DOI: 10.1073/pnas.1905912116
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