白杨（Populus deltoides Marsh.）叶片的颤抖和气体交换。
Quaking and Gas Exchange in Leaves of Cottonwood (Populus deltoides, Marsh.).
机构信息
Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843.
出版信息
Plant Physiol. 1978 Mar;61(3):331-3. doi: 10.1104/pp.61.3.331.
Cottonwood (Populus deltoides, Marsh.) leaves are amphistomatous and have an adaptation in their petiole which allows them to oscillate in wind. A possible function of these oscillations in enhancing gas exchange was studied.Cottonwood leaves were found to oscillate in the presence of wind velocities frequently encountered in nature. A pressure differential across the leaf was shown to result in bulk flow of air through that leaf. Oscillating a cottonwood leaf at frequencies found to occur in nature was found to increase the rate of O(2) flux through the leaf. The measured changes in boundary layer resistances during oscillations were found to be insufficient to account for the increased O(2) flux. Thus, the bulk flow of air through an oscillating cottonwood leaf results in a decreased total resistance which is typically 25% less than that of a still leaf.
三角叶杨（Populus deltoides，Marsh.）的叶片为两面叶，叶柄的一种适应性特征使其能够在风中摆动。本研究旨在探究这种摆动对增强气体交换的可能作用。实验发现，三角叶杨叶片在自然环境中常见的风速下会发生摆动。叶片两侧的气压差会导致空气通过叶片的主流体流动。以自然环境中出现的频率使三角叶杨叶片发生摆动，会增加叶片的氧气通量。实验发现，摆动过程中边界层阻力的变化不足以解释氧气通量的增加。因此，通过摆动的三角叶杨叶片的空气主流体流动会导致总阻力减小，通常比静止叶片小 25%。
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