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

doi:10.1016/j.agrformet.2015.08.249

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

^*Corresponding author for this work

Biosciences

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

This study proposes Jarvis-type model parameterisations for estimating stomatal conductance (g_s) 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 g_s with phenological and environmental factors were evaluated using a boundary line technique. Results suggest that g_s-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 g_s (g_max) by approximately 35%.

Original language	English
Pages (from-to)	117-123
Number of pages	7
Journal	Agricultural and Forest Meteorology
Volume	214-215
Early online date	24 Aug 2015
DOIs	https://doi.org/10.1016/j.agrformet.2015.08.249
Publication status	Published - 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

Access to Document

10.1016/j.agrformet.2015.08.249Licence: None: All rights reserved

http://www.sciencedirect.com/science/article/pii/S0168192315006814Licence: None: All rights reserved

Cite this

@article{b68af97306764220b51880d2e739df57,

title = "Modelling stomatal conductance of wheat:: An assessment of response relationships under elevated CO2",

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%.",

keywords = "Humidity, Jarvis model, Soil moisture, Transpiration, Triticum aestivum, Vapour pressure deficit",

author = "Alireza Houshmandfar and Fitzgerald, {Glenn J.} and Roger Armstrong and Macabuhay, {Allene A.} and Michael Tausz",

year = "2015",

month = dec,

day = "15",

doi = "10.1016/j.agrformet.2015.08.249",

language = "English",

volume = "214-215",

pages = "117--123",

journal = "Agricultural and Forest Meteorology",

issn = "0168-1923",

publisher = "Elsevier",

}

TY - JOUR

T1 - Modelling stomatal conductance of wheat:

T2 - An assessment of response relationships under elevated CO2

AU - Houshmandfar, Alireza

AU - Fitzgerald, Glenn J.

AU - Armstrong, Roger

AU - Macabuhay, Allene A.

AU - Tausz, Michael

PY - 2015/12/15

Y1 - 2015/12/15

N2 - 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%.

AB - 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%.

KW - Humidity

KW - Jarvis model

KW - Soil moisture

KW - Transpiration

KW - Triticum aestivum

KW - Vapour pressure deficit

UR - http://www.scopus.com/inward/record.url?scp=84940037718&partnerID=8YFLogxK

U2 - 10.1016/j.agrformet.2015.08.249

DO - 10.1016/j.agrformet.2015.08.249

M3 - Article

AN - SCOPUS:84940037718

SN - 0168-1923

VL - 214-215

SP - 117

EP - 123

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

ER -