Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 214, Issue -, Pages 117-123Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2015.08.249
Keywords
Humidity; Jarvis model; Transpiration; Triticum aestivum; Vapour pressure deficit; Soil moisture
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Funding
- Australian Commonwealth Department of Agriculture
- Grains Research and Development Corporation
- Australian Research Council
- Melbourne International Research Scholarship
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This study proposes Jarvis-type model parameterisations for estimating stomatal conductance (g(s)) in wheat (Triticum aestivum L.) under ambient [CO2] (a[CO2], approximately 390 mu mol mol(-1)) and elevated [CO2] (e[CO2], approximately 550 mu mol mol(-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 2.5 kPa under a[CO2] and e[CO2] respectively, and optimum temperature was 2 degrees C lower under e[CO2]. Elevated [CO2] decreased maximum g(s) (g(max)) by approximately 35%. (C) 2015 Elsevier B.V. All rights reserved.
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