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形数随相对冠长增大而减小,两者之间存在紧密的相关关系,把相对冠长作为辅助因子,配合树高建立形数预测模型,按立木材积三要素测定材积,可在不测上部直径的情况下,有效地提高立木材积的测定精度。
The shape number decreases with the increase of the relative crown length. There is a close correlation between the two. With the relative crown length as a cofactor, the shape prediction model is established according to the tree height. In the case of the upper diameter, the measurement accuracy of the wood volume is effectively improved.