Simulations and observations of patchy stomatal behavior in leaves of Quercus crispula, a cool-temperate deciduous broad-leaved tree species.
Simulations and observations of patchy stomatal behavior in leaves of Quercus crispula, a cool-temperate deciduous broad-leaved tree species.
复制标题
寒温带落叶阔叶树种卷叶栎叶子斑片气孔行为的模拟和观察。
DOI：
10.1007/s10265-011-0460-8
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发表时间：
2012
影响因子：
2.8
通讯作者：
Muramatsu K. and Muraoka H.
中科院分区：
文献类型：
--
作者：
Kamakura M.;Kosugi Y.;Muramatsu K. and Muraoka H.
研究了栓皮栎幼树和林冠树叶片的斑片状气孔行为。通过结合叶片气体交换测量和数值模拟，我们发现气孔关闭模式（均匀或斑片状双峰）与净同化率（A）的抑郁症。结果表明，在不同的生长条件下，蒸腾速率对皱皮栎叶片气孔关闭有明显的抑制作用，但抑制作用的大小因生长时间和生长条件而异。观察到的和simulatedA值的树苗和冠层树的比较确定的气孔行为模式，根据环境条件的均匀和斑块的频率分布之间灵活地转移。双峰气孔关闭解释了在相对较高的叶温和蒸汽压赤字的条件下，Ain幼树严重抑郁症。通过双峰气孔关闭的模型模拟的Adepression证实了直接观察气孔孔径分布使用铃木的缩微印刷方法，这些表明，有一个真实的双峰频率分布的气孔孔径。虽然有一个不均匀分布的气孔开度内和之间的补丁，诱导的异质性，在细胞间CO2浓度之间的补丁，因此严重抑郁症ofA，只导致从双峰气孔关闭补丁之间（而不是补丁内）。
We investigated the occurrence of patchy stomatal behavior in leaves of saplings and a forest canopy tree ofQuercus crispulaBlume. Through a combination of leaf gas-exchange measurements and numerical simulation, we detected patterns of stomatal closure (either uniform or patchy bimodal) coupled with depression of net assimilation rate (A). There was a clear inhibition ofAassociated with stomatal closure in leaves ofQ.crispuladuring the day, but the magnitude of inhibition varied among days and growing conditions. Comparisons of observed and simulatedAvalues for both saplings and the canopy tree identified patterns of stomatal behavior that shifted flexibly between uniform and patchy frequency distributions depending on environmental conditions. Bimodal stomatal closure explained severe depression ofAin saplings under conditions of relatively high leaf temperature and vapor pressure deficit. Model simulations ofAdepression through bimodal stomatal closure were corroborated by direct observations of stomatal aperture distribution using Suzuki’s Micro-Printing method; these demonstrated that there was a real bimodal frequency distribution of stomatal apertures. Although there was a heterogeneous distribution of stomatal apertures both within and among patches, induction of heterogeneity in intercellular CO2concentration among patches, and hence severe depression ofA, resulted only from bimodal stomatal closure among patches (rather than within patches).