胸高形数

胸高形数非线性数学模型的建立及应用

Establishing nonlinear mathematic model for breast height form factor and its application

用正形数胸高形数和经验回归方程编制人工林立木材积表

Construction the volume table with the normal form factor , the breast height form factor and the experimental regression formula

基于杉木林分调查数据讨论了林分胸高形数η和径高比δ随林龄t变化的相关性。

The correlation between the breast diameter height form factor η and the diameter height ratio δ with respect to the change in tree age t has been analyzed based on the data obtained from China fir forests .

在使用林分生长过程表中，文章就林分株数、立木材积、平均生长量、生长率、胸高形数、稀疏株数等因子的补充计算及其应用方面作初步探讨

In the course of using stand growth process table , primary discussion was made on supplement calculation and application of some factors such as tree number of stand , stumpage volume of timber , average growth quantum and growth rate , etc