Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2
Modelling stomatal conductance of wheat: An assessment of response relationships under elevated CO2
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DOI：
10.1016/j.agrformet.2015.08.249
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发表时间：
2015-12
影响因子：
6.2
通讯作者：
A. Houshmandfar;G. Fitzgerald;R. Armstrong;Allene Macabuhay;M. Tausz
中科院分区：
文献类型：
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作者：
A. Houshmandfar;G. Fitzgerald;R. Armstrong;Allene Macabuhay;M. Tausz
本研究提出了Jarvis-type模型参数估计气孔导度（GS）在小麦（Triticum aestivumL.）在环境[CO2]（a[CO2]，约390 μmol mol−1）和升高[CO2]（e[CO2]，约550 μmol mol−1）下，基于在澳大利亚谷物自由空气CO2富集（AGFACE）设施中收集的测量值。利用边界线技术评价了gs与物候和环境因子的关系。结果表明，a[CO2]和e[CO2]条件下，VPD、VSM和温度依赖性的gs-响应函数不同：a [CO2]和e [CO2]条件下，VPD分别在3和2.5 kPa左右诱导气孔关闭，e[CO2]条件下，最适温度降低2 °C。升高的[CO2]使最大值（gmax）降低约35%。
This study proposes Jarvis-type model parameterisations for estimating stomatal conductance (gs) in wheat (Triticum aestivumL.) under ambient [CO2] (a[CO2], approximately 390 μmol mol−1) and elevated [CO2] (e[CO2], approximately 550 μmol mol−1), based on measurements collected in the Australian Grains Free Air CO2Enrichment (AGFACE) facility. Relationships ofgswith phenological and environmental factors were evaluated using a boundary line technique. Results suggest thatgs-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 °C lower under e[CO2]. Elevated [CO2] decreased maximumgs(gmax) by approximately 35%.