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本研究分析了同龄纯林的林木生长量,探索了直径生长机制和树高生长机制之间的显著差异。在直径生长实际情况中,定期直径生长量和已知林龄的直径之间存在正线性关系。然而,在树高生长的实际情况中,定期树高生长量与已知林龄的树高之间没有什么关系。基于这一结论,提出了同龄纯林树高生长的随机模型,并通过分析,推导了反映树高分布方差增大的方程。此模型能够说明许多树高分布变动系数小于直径分布变动系数的现象。
In this study, we analyzed the tree growth of pure forests of the same age and explored the significant differences between the diameter growth mechanism and the tree height growth mechanism. In the actual case of diameter growth, there is a positive linear relationship between the regular diameter growth and the known diameter of the forest. However, in the real case of tree height growth, there is no relation between the tree height growth at a regular time and the tree height at a known age. Based on this conclusion, a stochastic model of height growth of pure stands of the same age was proposed. Based on the analysis, the equation reflecting the increasing variance of tree height distribution was deduced. This model can explain many phenomenon that the variation coefficient of tree height distribution is smaller than the variation coefficient of diameter distribution.