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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。
Based on the principle of Fuzzy mathematics, this paper presents a method to predict the site productivity of Chinese fir and the mean height of Cunninghamia lanceolata according to the site suitability. The method first determines the membership function of site-suitable fir growth and then transforms a series of site factors index data into a set of fuzzy sets. According to the principle of fuzzy filtering closeness, the site productivity of Chinese fir woodland is determined. Accordingly, based on the concept of the status index of Chinese fir, this paper predicts the average height of dominant species of Chinese fir in different ages according to the statistical principle.