立地指数是以林木生长指数反映立地质量的一种数量指标,它受环境和土壤因子所制约,在编制立地指数表的同时,若能找出影响立地质量和林木生长的主导因子,分析它们之间的相互关系,建立数学模式,可作为预测林木生长,评价立地质量和确定如何提高林地生产力的依据。本文为在编制广东杉木立地指数表的过程中,对影响立地质量的环境及土壤因子进行统计分析,选出主导因子,据此确立数学模式,以供广东选择杉木立地时参考。 The site index is a quantitative index reflecting the site quality by the tree growth index. It is controlled by the environment and the soil factor. When the site index table is compiled, if the dominant factor affecting site quality and forest growth can be found, The relationship between the establishment of mathematical models can be used as a basis for predicting forest growth, site quality evaluation and determine how to improve the productivity of woodland. In this paper, in the process of compilation of the site index of cedar in Guangdong, a statistical analysis is made on the environment and soil factors that affect the site quality, and the dominant factor is selected to establish the mathematical model for the reference of the site selection of cedar in Guangdong.