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在林业科学研究和生产中,常要求不伐倒树木来测定立木材积。这就要求先解决测定立木中央直径的问题。以往,测定中央直径时,都用仪器进行,有许多困难和不便之处。除了用仪器测定中央直径外,能否不用仪器而采用计算的方法呢?本文就此作一尝试。一、计算公式树木的生长、发育和各部位之间的关系,都有着一定的规律。不合规律的生长和畸异的体形仅是极少数。可以说,树木的中央直径跟胸高直径、树高之间,无疑是存在着一定的相关关系的。根据初步研究,得出计算中央直径的数学公式如下:
In the research and production of forestry science, it is often required to measure the stand volume without cutting down the trees. This requires the first solution to the problem of measuring the diameter of standing wood. In the past, when measuring the central diameter, all instruments were used, with many difficulties and inconveniences. In addition to measuring the central diameter of the instrument, the instrument can be used without calculating the method? This article to make an attempt. First, the calculation formula Tree growth, development and the relationship between the various parts, have a certain law. Irregular growth and abnormal body shape is only a very small number. It can be said that the central diameter of the tree with chest diameter, tree height, there is no doubt there is a certain correlation between. According to the preliminary study, the mathematical formula for calculating the center diameter is as follows: