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做到适地适树,就要了解地和树的客观规律,既要掌握树对环境条件的重求(即生态学特性),又要掌握地对树是否相适应。不同的立地条件对杉木的生长有着很大的差异,因此,选择好适宜的造林地,常常是造林成败的关键。评价杉木林林地立地条件的优劣,目前可以采用编制的立地指数表求得。在生产实践中,人们需要的是宜林地造杉的适应性及其效果的预测。本文以立地类型调查的五十六块标准地材料为基础,并以此编制的杉木立地指数表为依据,把立地因子与立地指数结合起来建立多元线性回归方程,试分析影响杉木生长的主导因子及其与生长量的关系,为科学鉴定宜林地造杉的适应性和预测其生长量提供理论依据。
Appropriate to adapt to the tree, it is necessary to understand the objective laws of the tree and the tree, it is necessary to grasp the tree on the environmental conditions of the heavy demand (that is, ecological characteristics), but also grasp the tree to adapt. Different site conditions have great differences on the growth of Chinese fir. Therefore, choosing suitable land for afforestation is often the key to afforestation success. Evaluation of the advantages and disadvantages of the site conditions of Cunninghamia lanceolata forest can be used to prepare the site index table obtained. In production practice, what people need is the adaptability of the fir plantation and the prediction of its effect. Based on the fifty-six standard materials of the site type survey and based on the site index of Chinese fir, a multivariate linear regression equation was established by combining the site factor with the site index to analyze the dominant factors that affect the growth of Chinese fir And its relationship with the amount of growth, to provide a theoretical basis for the scientific identification of the adaptability of Cunninghamia lanceolata and its growth prediction.