一.绪言树木的干形是随着树种和立地环境条件的差异而改变的。因而假如林木的树种和生长地区不同,即或树木的胸径和树高相同,而由于干形的差异,其材积就未必相同。因此,利用材积表计算林分的蓄积量时,其结果的精确度就取决于所使用的材积表适合于该地区的程度。立木材积表应分别地区、树种、树高级和林型来编制的道理就在于此。 I. INTRODUCTION The dryness of trees varies with the environmental conditions of trees and habitats. Therefore, if the tree species and growth areas are different, that is, the tree diameter and the height of the tree are the same, the volume may not be the same due to the difference of dryness. Therefore, when using the Volume Table to calculate the stock volume of a stand, the accuracy of the result depends on the extent to which the volume chart used fits in the area. Here is the rationale for the establishment of a timber inventory on the basis of the area, tree species, tree height and forest type, respectively.