A model for leaf temperature decoupling from air temperature
A model for leaf temperature decoupling from air temperature
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DOI：
10.1016/j.agrformet.2018.07.012
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发表时间：
2018-11-15
影响因子：
6.2
通讯作者：
Michaletz, Sean T.
中科院分区：
文献类型：
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作者：
Blonder, Benjamin;Michaletz, Sean T.
叶温（T-leaf）影响呼吸、光合和蒸腾速率。T-leaf和T-air之间关系的局部斜率β描述了叶子的热响应。已经观察到一系列值，其中β < 1指示有限的恒温，其中T-叶以低于T-空气的速率增加，β = 1指示变温，其中T-叶跟踪T-空气，并且β> 1指示高温，其中T-叶逐渐超过T-空气。然而，理论的变化，β尚未制定。在这里，我们推导出一个beta方程，预测它如何随着多个特质和微环境变量而变化。该方法还预测如何维护T叶远离致命的高值可能有助于解释调节气孔导度（GS）。这项工作描绘的背景下，预计每一类叶的热响应，并预测叶的热极端环境的反应发展的概念。
Leaf temperature (T-leaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between T-leaf and T-air, beta describes leaf thermal responses. A range of values have been observed, with beta < 1 indicating limited homeothermy where T-leaf increases at a lower rate than T-air, beta = 1 indicating poikilothermy where T-leaf tracks T-air, and beta > 1 indicating megathermy where T-leaf increasingly exceeds T-air. However, theory for variation in beta has not been developed. Here we derive an equation for beta that predicts how it varies with multiple trait and microenvironment variables. The approach also predicts how maintenance of T-leaf away from lethally high values may help explain regulation of stomatal conductance (gs). The work delineates contexts in which each class of leaf thermal response is expected and develops concepts for predicting leaf responses to thermally extreme environments.