Vertical variation in leaf gas exchange parameters for a Southeast Asian tropical rainforest in Peninsular Malaysia
Vertical variation in leaf gas exchange parameters for a Southeast Asian tropical rainforest in Peninsular Malaysia
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DOI：
10.1007/s10265-012-0495-5
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发表时间：
2012-05
影响因子：
2.8
通讯作者：
Y. Kosugi;S. Takanashi;N. Yokoyama;E. Philip;Mai Kamakura
中科院分区：
文献类型：
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作者：
Y. Kosugi;S. Takanashi;N. Yokoyama;E. Philip;Mai Kamakura
研究了马来西亚半岛低地龙脑林树木叶片气体交换特征的垂直变化。在饱和光合光子通量密度条件下，对林下、林下和林下叶片的最大净光合速率、气孔导度和电子传递速率进行了原位研究。研究了不同高度下叶片的暗呼吸速率。气体交换特性之间的关系，以及与单位叶面积含氮量和单位叶面积干物质之间的关系得到了清晰的检测，形成了代表气体交换相关几个重要参数垂直剖面的一般方程。数值分析表明，气体交换参数的垂直分布得到了很好的确定，表明整个冠层的碳增益较大，同时最低层叶片的碳增益为正。为了在多层模型中正确估计叶片和冠层尺度上的气体交换，必须考虑气体交换参数的垂直分布，并选择合适的尺度系数。
Vertical variation in leaf gas exchange characteristics of trees grown in a lowland dipterocarp forest in Peninsular Malaysia was investigated. Maximum net photosynthetic rate, stomatal conductance, and electron transport rate of leaves at the upper canopy, lower canopy, and forest floor were studied in situ with saturated condition photosynthetic photon flux density. The dark respiration rate of leaves at the various heights was also studied. Relationships among gas exchange characteristics, and also with nitrogen content per unit leaf area and leaf dry matter per area were clearly detected, forming general equations representing the vertical profile of several important parameters related to gas exchange. Numerical analysis revealed that the vertical distribution of gas exchange parameters was well determined showing both larger carbon gain for the whole canopy and at the same time positive carbon gain for the leaves of the lowest layer. For correct estimation of gas exchange at both leaf and canopy scales using multi-layer models, it is essential to consider the vertical distribution of gas exchange parameters with proper scaling coefficients.