Influence of leaf size on tree architecture: first branch height and crown dimensions in tropical rain forest trees
Influence of leaf size on tree architecture: first branch height and crown dimensions in tropical rain forest trees
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DOI：
10.1007/s004680050172
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发表时间：
1998-06
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影响因子：
--
通讯作者：
D. A. King
中科院分区：
文献类型：
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作者：
D. A. King
第一枝高度是树苗结构的一个重要属性，因为它定义了可以长期横向生长的高度。对澳大利亚、哥斯达黎加、巴拿马和马来西亚沙巴热带雨林中的 70 个树种的树苗进行测量，发现第一枝高度与叶片和叶柄长度高度相关。观察到的关系，第一分枝高度∝叶片长度×（叶柄长度）0.5，表明在叶柄与叶片长度给定比率的物种中，第一分枝高度与叶片长度的比率随着叶子尺寸的增加而有所增加。正交异性物种，其叶子在上升轴上或多或少呈径向对称排列，其平均第一分枝高度为具有平面叶子排列的斜异性物种观察到的 7 倍。正交各向异性物种较大的第一分枝高度与其较大的叶子和较长的叶柄有关。根据哥斯达黎加遗址的评估，在幼苗阶段，斜向物种的树冠比正交物种的树冠更宽。因此，叶片尺寸影响冠结构的动态（反之亦然），并影响叶片能量平衡和气体交换。
First branch height is an important attribute of sapling architecture, as it defines the height at which prolonged lateral growth is possible. First branch height, measured on saplings of 70 species in tropical rain forests of Australia, Costa Rica, Panama, and Sabah, Malaysia, was highly correlated with leaf blade and petiole length. The observed relationship, first branch height ∝ blade length × (petiole length)0.5, implies that the ratio of first branch height to blade length increases somewhat with increasing leaf size, among species with a given ratio of petiole to blade length. Orthotropic species, with more or less radially symmetric arrangements of leaves on ascending axes, had a mean first branch height of 7x that observed for plagiotropic species, with planar leaf arrangements. The greater first branch height of orthotropic species was associated with their larger leaves and longer petioles. Plagiotropic species had wider crowns than orthotropic species in the sapling stage, as assessed at the Costa Rican site. Thus, leaf dimensions influence the dynamics of crown construction (or visa versa), as well as affecting leaf energy balance and gas exchange.