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首页> 外文期刊>Journal of Forest Planning >An Estimate of Full Density Curves for Branches on Standing Trees: A Case Study of the Evergreen Broadleaf Tree, Quercus acuta, in the Tokyo University Forest in Chiba, Japan
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An Estimate of Full Density Curves for Branches on Standing Trees: A Case Study of the Evergreen Broadleaf Tree, Quercus acuta, in the Tokyo University Forest in Chiba, Japan

机译：站立树木的树枝全密度曲线的估计：以日本千叶东京大学森林的常绿阔叶树为研究对象

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摘要

The purpose of this study was to determine the full density curves of branches on standing trees. Sixty sample trees of Quercus acuta in a single stand were selectively cut in the Tokyo University Forest in Chiba, and then diameters and lengths of those branches with more than 2cm diameter that were at a length between 3.3m and 9.3m above ground were measured at one meter intervals along their stems and branches. To derive the full density curve of branches, the number of branches at a specific length and the maximum average volumes of branches above that length were selected to be independent and dependent variables, respectively in reference to the pipe model theory. The linear relationships between these variables were investigated on a log-log scale. The result showed that the regression estimates were significant for lengths from 4.3m to 8.3m, and that the full density curves for these significant lengths were considered to have a common slope parameter of -0.9801. This implied that the -3/2 power law of self-thinning is effective for branches on standing trees that are similar to the standing trees in forest stands. Further research was required, however, to investigate whether this slope is applicable not only to Quercus acuta but also to other species.
机译：这项研究的目的是确定立木上树枝的全密度曲线。在千叶县的东京大学森林中，有选择地砍伐一棵林木中的60棵栎树样品树，然后在30米的地面上测量直径在2cm以上的那些树枝的直径和长度，这些树枝的长度和长度在地上3.3m和9.3m之间。沿它们的茎和分支间隔一米。为了得出分支的完整密度曲线，分别参考管道模型理论，将特定长度的分支数量和该长度以上的最大分支平均体积选择为独立变量和因变量。这些变量之间的线性关系以对数-对数刻度进行研究。结果表明，从4.3m到8.3m的长度，回归估计值是显着的，并且这些显着长度的全密度曲线被认为具有-0.9801的共同斜率参数。这意味着自稀疏的-3/2幂定律对于立木的分支有效，类似于森林林中的立木。但是，需要进一步的研究，以调查该坡度是否不仅适用于栎栎，而且适用于其他物种。

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