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本文介绍一种在固定水平样点上估计进界生长量的方法。本法在所有的森林抽样条件下都可获得无偏估计值。在以下几方面不同于以前的一些方法;(1)任一次检尺时,仅需对“进界”和大于最小胸径的树木做记号或检尺。(2)对于应测树木*和漏测树木**不要求特别的检尺方法。(3)两次估计的材积差总等于各生长量组成部分估计值的总和。因此,可以获得永久固定大小样地的相加性特征。
This article presents a method of estimating the amount of ingrowth at a fixed horizontal spot. This Law gives unbiased estimates of all forest sampling conditions. In the following aspects are different from some of the previous methods; (1) any one ruler, only the “bounded” and greater than the minimum diameter of the trees do mark or ruler. (2) No special inspection method is required for the tree to be measured * and the tree to be missed. (3) The volume difference between two estimates is always equal to the sum of the estimated values of the components of each growth. Therefore, it is possible to obtain additive features of permanently fixed size plots.