Crown Spread Patterns for Five Deciduous Broad-leaved Woody Species: Ecological Significance of the Retention Patterns of Larger Branches
Crown Spread Patterns for Five Deciduous Broad-leaved Woody Species: Ecological Significance of the Retention Patterns of Larger Branches
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五种落叶阔叶木本树冠蔓延模式：较大枝条保留模式的生态意义
DOI：
10.1006/anbo.1997.0519
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发表时间：
1997
期刊：
影响因子：
4.2
通讯作者：
A. Komiyama
中科院分区：
文献类型：
--
作者：
A. Sumida;A. Komiyama
摘要两种不耐荫树种(白桦和白桦)的树冠伸展和枝条保持格局。与三种耐性较强的树种(蒙古栎属、枫树属和倒卵厚朴属)进行了比较。与耐荫树种相比，两种白桦树种的分枝高度(最低存活枝高度)随年龄增长的速度更快。分枝高度OFA。Sieboldianum和M.无论树高和树龄，倒卵叶树都是相似的，当比较相似高度的树时，较大的树往往会产生比两个树种更宽的树冠。在所有树种中，随着枝条在茎上的位置变低，枝的断面积(枝在其根部的横截面积)和每枝的叶面积通常都会增加。因此，保留较大的枝条对支持较大的单株叶面积有显著的贡献。两种树种的较大分枝数(分枝断面积80 cm~2)均显著少于耐荫树种。桦树树种的枝条滞留格局可能是树叶对遮荫不耐受的结果。随着森林演替，桦树种的衰退很可能是由于它们不能在封闭林中保留具有较大基地面积的树枝。
Abstract Patterns of crown spread and branch retention of two shade-intolerant species (Betula platyphyllaandB. maximowicziana) were compared with three more tolerant species (Quercus mongolica,Acer sieboldianumandMagnolia obovata). Branching height (height of the lowest living branch) rose more rapidly with age for the twoBetulaspecies than for the shade tolerant species. Branching heights ofA. sieboldianumandM. obovatawere similar, irrespective of tree height and age, and larger trees tended to produce wider crowns than theBetulaspecies when trees of similar height were compared. In all species, the branch basal area (cross-sectional area of a branch at its base) and the leaf area per branch generally increased as the branch position on a stem became lower. Therefore, retaining larger branches contributed significantly to the support of a larger leaf area per tree. The number of larger branches (branch basal area >80 cm2) for bothBetulaspecies was significantly smaller than that of the shade tolerant species. The branch retention pattern ofBetulaspecies was probably a consequence of intolerance of the leaves to shade. The decline ofBetulaspecies with forest succession is likely to occur through their inability to retain branches with a large base area in closed forests.