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地位指数表或地位级表是目前评定立地质量的二种用表。这两种表都是依赖于林分的平均优势高或林分平均高与林分平均年龄的关系来编制的,都能在有林地中使用。但是,无法使用于无林地,更不能估计各立地因子对林木生长作用的大小。近年来,许多研究表明,对无林地的立地质量评定,判定各立地因子对林木生长作用大小,可通过地位指数与立地因子的关系来建立数学模型解决。本文应用模糊(Fuzzy)关系方程对立地质量评价问题进行探讨。
The status index table or status table is currently used to assess the site quality of the two kinds of tables. Both tables are compiled based on the high average superiority of stand or the relationship between the mean stand height and average stand age, and can be used in forested land. However, they can not be used in non-woodlands, but can not estimate the effect of each site factor on the growth of trees. In recent years, many studies have shown that the assessment of the site quality of non-woodland land to determine the effect of each site factor on the growth of trees can be solved by establishing a mathematical model based on the relationship between site index and site factor. In this paper, fuzzy relational equation is applied to evaluate the site quality evaluation.