Leaf- and stand-level responses of a forested mesocosm to independent manipulations of temperature and vapor pressure deficit

Greg A Barron-Gafford, Katherine A. Grieve, Ramesh Murthy

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Alterations in temperature (T) and vapor pressure deficit (VPD) strongly influence gas exchange, but because VPD is highly influenced by T, the effects of these two factors are difficult to separate. Here, the concomitant effects of T and VPD on CO2 uptake, stomatal conductance, and transpiration at leaf- and canopy-levels were examined for a stand of trees (Populus deltoides) enclosed within large mesocosms. T and VPD were independently altered to yield a factorial combination of treatments of low (24°C) or high (30°C) T and low (0.75) or high (1.75 kPa) VPD. Traditional leaf-level gas exchange measurements were compared with whole-canopy exchange to verify typical scaling methods. Elevated T resulted in an average 40% and 14% increase in midday leaf-level and canopy-level net CO2 uptake, respectively. Other physiological responses to elevated T and VPD were similar at both scales, but the magnitude of change was usually less pronounced at the canopy-level. Surprisingly, only minimal interactions between T and VPD were found to influence responses of CO2 uptake and stomatal conductance at either level.

Original languageEnglish (US)
Pages (from-to)614-625
Number of pages12
JournalNew Phytologist
Volume174
Issue number3
DOIs
StatePublished - May 2007

Fingerprint

Vapor Pressure
vapor pressure
Vapor pressure
Temperature
leaves
temperature
canopy
uptake mechanisms
gas exchange
stomatal conductance
Gases
Populus
Transpiration
Populus deltoides
plant response
transpiration

Keywords

  • Biosphere 2 Laboratory
  • Conductance
  • Net ecosystem carbon exchange
  • Photosynthesis
  • Populus deltoides
  • Sap flux
  • Scaling

ASJC Scopus subject areas

  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Leaf- and stand-level responses of a forested mesocosm to independent manipulations of temperature and vapor pressure deficit. / Barron-Gafford, Greg A; Grieve, Katherine A.; Murthy, Ramesh.

In: New Phytologist, Vol. 174, No. 3, 05.2007, p. 614-625.

Research output: Contribution to journalArticle

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