Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2

Alireza Houshmandfar, Glenn J. Fitzgerald, Roger Armstrong, Allene A. Macabuhay, Michael Tausz

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This study proposes Jarvis-type model parameterisations for estimating stomatal conductance (gs) in wheat (Triticum aestivum L.) under ambient [CO2] (a[CO2], approximately 390μmolmol-1) and elevated [CO2] (e[CO2], approximately 550μmolmol-1), based on measurements collected in the Australian Grains Free Air CO2 Enrichment (AGFACE) facility. Relationships of gs with phenological and environmental factors were evaluated using a boundary line technique. Results suggest that gs-response functions for vapour pressure deficit (VPD), volumetric soil moisture (VSM) and temperature dependence were different between a[CO2] and e[CO2]: VPD induced stomatal closure at approximately 3 and 2.5kPa under a[CO2] and e[CO2] respectively, and optimum temperature was 2°C lower under e[CO2]. Elevated [CO2] decreased maximum gs (gmax) by approximately 35%.

Original languageEnglish
Pages (from-to)117-123
Number of pages7
JournalAgricultural and Forest Meteorology
Volume214-215
Early online date24 Aug 2015
DOIs
Publication statusPublished - 15 Dec 2015

Keywords

  • Humidity
  • Jarvis model
  • Soil moisture
  • Transpiration
  • Triticum aestivum
  • Vapour pressure deficit

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Forestry
  • Atmospheric Science
  • Global and Planetary Change

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