Fuzzy数学在杉木立地生产预测中的应用

本文根据Fuzzy数学原理,介绍一种按立地条件适宜度对杉木的立地生产力水平和杉木优势木平均高进行预测的方法。该方法首先确定立地因素适宜杉木生长的隶属函数,然后将林地的一系列立地因素指标数据转换为一组Fuzzy集合,从而根据Fuzzy滤波贴近度原理,确定杉木林地的立地生产力水平。据此,本文以杉木的地位指数概念为依据,再根据统计原理对不同林地各林龄的杉木林分优势木平均高进行预测。

THE APPLICATION OF THE FUZZY MATHEMATICS IN PREDICTION OF THE SITE QUALITY OF THE CHINA-FIR

Based on the theory of the Fuzzy mathematics* this paper presents a method to predict the site qualtty level and dominant mean height of the China-fir according to the site suitability-degree. The mathod is that at first the membership function of the site factor which is suitable to the growth of China-fir was established, then a siries of data of site factors from forest land was transformed into Fuzzy subsets, at last, on the basis of the hoery of Fuzzy filter close-degree, the site quality of forest land would be determined. On these erounds, with the site index of China-fir and the thoery of statistics, the dominant mean heights of every ages of China-fir stand were predicted.