MODELING STOMATAL BEHAVIOR AND PHOTOSYNTHESIS OF EUCALYPTUS-GRANDIS
MODELING STOMATAL BEHAVIOR AND PHOTOSYNTHESIS OF EUCALYPTUS-GRANDIS
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DOI：
10.1071/pp9900159
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发表时间：
1990-01-01
期刊：
影响因子：
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通讯作者：
LEUNING, R
中科院分区：
文献类型：
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作者：
LEUNING, R
利用便携式可控环境试管对巨桉叶片的气孔导度、CO2同化作用、蒸腾作用和胞间CO2摩尔分数进行了田间测定。测试叶片受到一定范围的温度、湿度、光子辐射和外部二氧化碳摩尔分数的影响。一个经验函数Gsw=Go+g1Ahs/Cs-.GAMMA)能够解释在广泛的环境条件和叶片光合作用能力范围内的稳态气孔导度Gsw。该方程称为气孔约束函数，A为CO2同化速率，hs和cs分别为叶表面相对湿度和CO2摩尔分数，GAMMA为CO2补偿点，Go为A=0时的导度，g1为经验系数。用约束函数同时求解描述气孔对CO2的供应和光合作用对CO2的需求的方程，得到气孔导度、CO2同化作用和胞间CO2摩尔分数与外界环境因素的组合模型和描述C3光合作用的几个参数。该模型很好地描述了实验观测结果。
Stomatal conductances, CO2 assimilation, transpiration and intercellular CO2 mol fractions of Eucalyptus grandis leaves were measured in the field using a portable, controlled environment cuvette. Test leaves were subjected to a range of temperatures, humidities, photon irradiances and external CO2 mol fractions. An empiral function, gsw = go + g1Ahs/Cs - .GAMMA.), was able to account for steady-state stomatal conductances gsw, over a wide range of environmental conditions and leaf photosynthetic capacities. In this equation, termed the stomatal constraint function, A is CO2 assimilation rate, hs and cs are relative humidity and CO2 mol fraction at the leaf surface respectively, .GAMMA. is the CO2 compensation point, go is conductance at A = 0 and g1 is an empirical coefficient. Equations describing the supply of CO2 through stomatal and demand for CO2 in photosynthesis were solved simultaneously with the constraint function to give a combined model of stomatal conductance, CO2 assimilation and intercellular CO2 mol fraction in terms of external environmental factors and several parameters describing C3 photosynthesis. The model provided a good description of experimental observations.