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
Agricultural and Forest Meteorology | ELSEVIER SCIENCE BV | Published : 2015
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[..View full abstract
The AGFACE facility is jointly run by the University of Melbourne and the Victorian Department of Economic Development, Jobs, Transport and Resources, with funding support from the Australian Commonwealth Department of Agriculture, the Grains Research and Development Corporation, and the Australian Research Council. The authors thank Markus Low and Sigfredo Fuentes for helpful suggestions regarding boundary line analysis, Russel Argall for leading the AGFACE field team, and Mahabubur Mollah for operating the CO<INF>2</INF> enrichment technology. AH receives a Melbourne International Research Scholarship. Soil moisture data were collected and calibrated by Markus Low and Russel Argall.