杉木立地生产力的Fuzzy预测

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林分优势木平均高进行预测的方法。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数据转换为一组Fuzzy集合,从而根据Fuzzy贴近度原理,确定杉木林地的立地生产力水平。再以杉木的地位指数为依据,并根据数理统计原理,对各林龄的杉木林分优势木平均高进行预测。

THE FUZZY PREDICTION OF THE SITE QUALITY OF THE CHINA FIR

Based on the theory of the Fuzzy mathematics, this paper presents a thod to predict the site quality level and dominant mean height of the China fir according to the site condition suitability-degree.This method, at first, is to set up the membership function of the site factors which are suitable for the growth of the China fir, then to transform a series of site factors data of the forest land into Fuzzy subsets, thus, on the basis of the theory of Fuzzy close-degree determining the site quality level of the forest land. On these grounds, in the light of the site index of the China fir and the theory of the statistics, this paper predicts the domirant mean height of every forest age of the Chinafir stand.