摘要
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 form factor decreases with the increase of the relative crown length and there exists the close correlation between the two.The measuring precision of standing volume can be also effectively raised without measuring the upper portion diameter,taking the relative crown length as the accessory factor to set up the form factor prediction model in combination with the tree height and according to three essential factors of standing volume to measure the volume.
出处
《福建林业科技》
北大核心
1999年第4期85-88,共4页
Journal of Fujian Forestry Science and Technology
关键词
杉木
材积
相对冠长
形数
预测模型
Cunninghamia lanceolata
Volume
Relative crown length
Form factor
Prediction model
