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樱桃叶片气孔导度模型构建
引用本文:高照全,赵晨霞,冯社章.樱桃叶片气孔导度模型构建[J].北京农业职业学院学报,2012,26(3):27-31.
作者姓名:高照全  赵晨霞  冯社章
作者单位:北京农业职业学院,北京,102442;北京农业职业学院,北京,102442;北京农业职业学院,北京,102442
基金项目:北京农业职业学院院级科研项目
摘    要:通过构建樱桃叶片气孔导度模型模拟Gs对小气候因子的响应。试验于2008-2011年在红灯樱桃(Prunus avium L.Hongdeng)园中进行,利用树冠上层叶片气体交换数据拟合了相应参数。结果表明,Gs的变化主要与小气候因子(如光合有效辐射PAR、空气温度Ta、相对湿度RH和CO2浓度等)和自身特性(如叶片水势Ψl)有关,其中Ψl、RH和Ta对Gs的影响较大。Gs随Ψl和RH增加而增加,当Ψl低于-1.5 MPa时两者之间相关性尤为显著。当温度增加时Gs呈"钟"形曲线,一般条件下28℃为Gs的最适温度,其最适温度还随PAR和CO2浓度的增加而升高。当PAR低于600μmol.m-2.s-1时,Gs随PAR升高而线性增加,超过600μmol.m-2.s-1后Gs增加不显著。Gs和CO2浓度一般呈负相关关系。模拟表明,不同因子之间存在显著交互作用,其中Ta和PAR,CO2和PAR之间交互作用尤为明显。

关 键 词:气孔导度  樱桃  模型  气体交换  小气候  叶片水势  CO2浓度

The Dynamic Simulation of Stomatal Conductance of Cherry Leaf
Gao Zhaoquan,Zhao Chenxia,Feng Shezhang.The Dynamic Simulation of Stomatal Conductance of Cherry Leaf[J].Journal of Beijing Agricultural Vocation College,2012,26(3):27-31.
Authors:Gao Zhaoquan  Zhao Chenxia  Feng Shezhang
Institution:(Beijing Agricultural Vocation College,Beijing 102442,China)
Abstract:A coupled model of gas exchange was developed which was able to systematically simulate the diurnal courses of Gs and the response of Gs to microclimatic factors.The experiment was conducted in a Hongdeng cherry(Prunus avium L.Hongdeng) orchard.The parameters of the model were tested by the data observed in upper canopy from 2008 to 2011 during the growing seasons.The simulation showed that Gs depends on plant characteristics and microclimatic factors including leaf water potential(Ψl),photosynthetically active radiation(PAR),air temperature(Ta),relative humidity(RH) and air CO2 concentration.The results showed that Gs was mostly affected by Ψl,RH and Ta.Gs increased with the increase of Ψland RH,especially when Ψlwas below-1.5 MPa.As Ta increased,the change of Gs followed a bell-shaped curve.28℃ was the optimum Ta for Gs in normal conditions.It should be noted that the optimum Ta for Gs shifted to a higher level as PAR or CO2 increased.There existed a positive linear relationship between Gs and PAR when PAR was below 600 μmol.m-2.s-1 and Gs did not show a significant increase when PAR increased from 600 to 1800 μmol.m-2.s-1 Generally there was a negative correlation between CO2concentration and Gs.Strong interactions existed among the various microclimatic factors to Gs,especially between Ta and PAR,PAR and CO2.
Keywords:Stomata1 Conductance  Cherry  Model  Gas Exchange  Microclimatic  Leaf Water Potential  CO2 Concentration
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