A Study on the Weibull Paramenters Expressing the Diameter Distribution of Plantations

柿原 道喜
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引用次数: 3

Abstract

A problem in the expressioi~ of diameter distribution of plantations using only the Weibull parameters a, b and c was examined. First, it was shown that the scatter of diameters could not be evaluated exactly using only parameter b. Therefore, to solve this, a simple calculating method of a standard deviation and variation coefficient of diameters using the Weibull parameters b and c was devised. From examples taken from application, it became clear that differences in the scatter of diameter distributions, where parameter b was nearly the same and c was greatly different, could be evaluated precisely by comparison of standard deviation and variation coefficient calculated using the above method. Furthermore, when comparing of some diameter distributions in which parameter b was different, it was shown that difference in the scatter of diameters must be evaluated using standard deviation and variation coefficient. From the viewpoint of forest management technology, it is very important to ascertain the scatter of diameters with regard to plantations. Therefore, the simple method of calculating standard deviation and variation coefficient of diameters proposed in this study should be utilized effectively in study of forest management technology of plantations using the Weibull distribution.
表示人工林直径分布的威布尔参数研究
研究了仅使用威布尔参数A、b和c来表示人工林直径分布的问题。首先,证明了仅使用参数b不能准确评价直径的散点。因此,为了解决这一问题,设计了一种使用威布尔参数b和c计算直径标准差和变异系数的简单方法。从应用实例中可以看出,通过比较上述方法计算的标准差和变异系数,可以精确地评价参数b几乎相同而参数c差异很大的直径分布的散点差异。此外,在对某些参数b不同的直径分布进行比较时,我们发现直径分布的差异必须用标准差和变异系数来评价。从森林经营技术的角度出发,确定人工林直径的散度是十分重要的。因此,在利用威布尔分布进行人工林经营技术研究时,应有效利用本文提出的计算标准差和直径变异系数的简便方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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