目前,我国各省(区)先后编制了几个树种的立地指数表,将为各地鉴定林分立地质量,制定合理的森林经营措施提供依据。编制立地指数表可用图解法和数式法,或两者相结合的方法。本文只讨论用数式法编表时,对于数学模型的选择与应用。优势木平均高—平均年龄相关曲线的配合,对于数学模型的选择虽都力求能够正确地反映树高的生长进程,但在实践中由于采用一般非线性回归方程(或线性化的非线性方程)去模拟,很难符合树高依年龄增长而变化的规律,这种情况已从大量的试验材料中发现。这就给编表工作带来了一定的困难,亦给测树和 At present, the provinces (districts) of our country have successively compiled the site index tables of several tree species, which will provide the basis for appraising the quality of stand-by areas and establishing reasonable forest management measures. The preparation of site index table can be used graphical and numerical methods, or a combination of both methods. This article discusses only the numerical method of tabulation, the choice of mathematical models and applications. Although the selection of mathematical models tries hard to correctly reflect the growth of tree height, in practice, due to the use of general nonlinear regression equation (or linearized nonlinear equation) To simulate, it is difficult to meet the law of tree height changes with age, this situation has been found in a large number of test materials. This has brought some difficulties to the tabulation work, but also to measure trees and