Impact of leaf physiological characteristics on seasonal variation in CO2, latent and sensible heat exchanges over a tree plantation
Impact of leaf physiological characteristics on seasonal variation in CO2, latent and sensible heat exchanges over a tree plantation
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DOI：
10.1016/s0168-1923(02)00128-4
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发表时间：
2002-12
影响因子：
6.2
通讯作者：
Katsunori Tanaka;Y. Kosugi;A. Nakamura
中科院分区：
文献类型：
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作者：
Katsunori Tanaka;Y. Kosugi;A. Nakamura
这项研究调查了叶子生理特征对植物群落二氧化碳、显热和潜热交换的影响。使用涡流相关系统对人工林树木进行了测量，在一年中的几天内浇水良好的土壤条件下进行了测量，并且仅在秋季的土壤干旱条件下进行了测量。研究了以下叶片生理特性：最大羧化率（VcMAX25：[Planta 149 (1980) 78-90]）、通过相对湿度（hs）调整的气孔导度（gs）和净同化率（An）之间的关系，以及叶表面的CO2浓度（cs）[气孔导度分析。博士论文。加利福尼亚州斯坦福大学，89 页]。作为叶片生理参数，VcMAX 以及气孔导度（gs）与 Anhs/cs 之间的关系是四种常绿树木通过单叶尺度的气体交换测量来估计的。数值模拟采用多层模型进行，该模型由大气扩散二阶闭合模型与辐射传输模型、Farquhar 型光合作用模型和 Ball 气孔导度模型组成。结果表明，VcMAX25的值每天都在变化，模拟时应采用合适的值。气孔导度 (gs) 和 Ahs/cs 之间的关系在土壤干旱条件下发生变化，并且在模拟中也应考虑到这种变化。这些结果表明，叶片生理特征的变化对人工林树木二氧化碳、潜热和显热交换的季节性变化有很大影响。
This study investigated the impact of leaf physiological characteristics on CO2, sensible heat, and latent heat exchanges over a plant community. Measurements were carried out over plantation trees using an eddy correlation system, under well-watered soil conditions for several days spanning the year, and under soil drought conditions during autumn only. The following leaf physiological characteristics were investigated: the maximum rate of carboxylation (VcMAX25: [Planta 149 (1980) 78–90]), the relationship between stomatal conductance (gs) and net assimilation rate (An) adjusted by relative humidity (hs), and CO2concentration at the leaf surface (cs) [An analysis of stomatal conductance. Ph.D. Thesis. Stanford University, CA, 89 pp.]. As the leaf physiological parameters, VcMAXand the relationship between stomatal conductance (gs) and Anhs/csof four evergreen trees were estimated from gas exchange measurements at the single leaf scale. Numerical simulations were carried out using a multi-layer model consisting of a second-order closure model for atmospheric diffusion coupled with a radiation transfer model, a Farquhar type photosynthesis model, and Ball’s stomatal conductance model. The results suggest that the value of VcMAX25changes every day, and that appropriate values should be used in simulations. The relationship between stomatal conductance (gs) and Ahs/cschanged under soil drought conditions, and this change should also be allowed for in simulations. These results show that changes in leaf physiological characteristics contribute considerably to seasonal variation in CO2, latent heat, and sensible heat exchanges over plantation trees.