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首页> 外文期刊>Tree Physiology >Effects of soil temperature on parameters of a coupled photosynthesis-stomatal conductance model
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Effects of soil temperature on parameters of a coupled photosynthesis-stomatal conductance model

机译：土壤温度对光合作用-气孔耦合电导模型参数的影响

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摘要

To axamine the effects of soil temperature on a coupled photosynthesis-stomatal conductance model, seedlings of trembling aspen (Populus tremuloides Michx.), jack pine (Pinus banksiana Lamb.), black spruce (Picea Mariana (Mill.) B.S.P.) and white spruce (Picea glauca (Moench) Voss) were exposed to soil temperatures ranging from 5 to 35 degreesC for 4 months. Light and CO2 response curves of foliar gas exchange were measured for model parameterization. The effects of soil temperature on four key model parameters, V-cmax (maximum rate of carboxylation), J(max). (maximum rate of electron transport), alpha (energy conversion efficiency or quantum efficiency of electron transport) and R-d (daytime dark respiration), were modeled using two third-order polynomial equations and a modified Arrhenius equation. In all species, V-cmax and J(max) increased with soil temperature up to an optimum, and then decreased with further increases in soil temperature. In the conifers, alpha showed a similar response to soil temperature as V-cmax and J(max), but soil temperature had no significant effect on alpha in aspen. Soil temperature had no significant effect on Rd in any species. The three equations described the relationships between soil temperature and the model parameters reasonably well, but performed best for V-cmax and worst for alpha. No significant relationships were identified between soil temperature and the parameters of the stomatal conductance model.
机译：为了研究土壤温度对光合作用-气孔-电导耦合模型，颤抖的白杨（Populus tremuloides Michx。），杰克松（Pinus bankiana Lamb。），黑云杉（Picea Mariana（Mill。）BSP）和白云杉幼苗的影响。 （Picea glauca（Moench）Voss）（Picea glauca（Moench）Voss）暴露于5至35摄氏度的土壤温度下4个月。测量叶面气体交换的光和CO2响应曲线以进行模型参数化。土壤温度对四个关键模型参数V-cmax（最大羧化率），J（max）的影响。 （最大电子传输速率），α（电子传输的能量转换效率或量子效率）和R-d（白天暗呼吸）使用两个三阶多项式方程和一个改进的Arrhenius方程进行建模。在所有物种中，V-cmax和J（max）随土壤温度升高至最佳水平，然后随土壤温度的进一步升高而降低。在针叶树中，阿尔法对土壤温度的响应与V-cmax和J（max）相似，但土壤温度对白杨的阿尔法没有显着影响。在任何物种中，土壤温度对Rd均无显着影响。这三个方程式很好地描述了土壤温度与模型参数之间的关系，但对于V-cmax表现最佳，而对于α而言表现最差。在土壤温度和气孔电导模型的参数之间没有发现显着的关系。

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