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首页> 外文期刊>Journal of forest research >Comparison of branch growth estimates in Larix gmelinii by several methods.
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Comparison of branch growth estimates in Larix gmelinii by several methods.

机译：用几种方法比较落叶松的分支生长估计值。

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摘要

Branch growth in Larix gmelinii was estimated by several methods. Sample trees were felled in Laoshan (northeastern China) and Sapporo (northern Japan). Estimates of the annual woody growth of branches calculated by the growth ratio of the cross-sectional area of each branch base were found to be lower compared with those calculated by a detailed method, in which branch growth was estimated by growth-ring analysis of radial segments in different age classes. A linear relationship was observed between the annual woody growth/whole branch mass ratio and the relative depth within the crown (RDC), where the distance between the treetop and crown base was set to 1.0. The total annual woody branch growth of each tree was estimated using this relationship by multiplying the ratio by the whole branch mass at a given RDC and adding the products from the treetop to the crown base. Alternative estimates were obtained using the total branch growth, defined as the annual woody growth plus leaf mass, and the 1 - RDC relationship. Estimates obtained by these methods were similar to those obtained by detailed growth-ring analysis of branches. Estimates obtained by the growth/mass ratio for only the stem within the crown were also compared with those obtained by detailed growth-ring analysis.
机译：兴安落叶松的分支生长通过几种方法估算。在La山（中国东北）和札幌（日本北部）砍伐了样本树木。发现通过每个分支基部的横截面积的生长率计算出的分支的年度木质生长估计值与通过详细方法（通过径向的生长环分析估计分支的增长）所计算出的估计值相比要低。不同年龄段的细分。观察到年生木本生/全枝质量比与树冠内相对深度（RDC）之间的线性关系，其中树梢与树冠基部之间的距离设置为1.0。通过将该比率乘以给定RDC处的整个分支质量，并将树顶到树冠基部的乘积相加，可以使用此关系估算每棵树的年均木质分支生长量。使用总树枝生长定义其他估计值，总树枝生长定义为年度木本生长加叶片质量，以及1-RDC关系。通过这些方法获得的估计与通过对分支进行详细的年轮分析获得的估计相似。还通过仅对冠内茎的生长/质量比获得的估计值与通过详细的生长环分析获得的估计值进行了比较。

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