【摘要】 <正> 在前人研究的基础上,笔者提出用相对干率来表示干形,通过相对干率可以把各种各样的现实树干转化为统一标准的圆柱体,并能够排列在一张平面图上实现直观图示。本文应用相对干率分析了长白山8个主要阔叶树种和同一树种不同树高阶段的干形差异及树干材积结构的变化。一、相对干率按照Hohenadl的5区分段等相对长区分求积法,令树干长L=1,从梢头开始取相对等间隔0.2L,在树干的0.1L,0.3L,0.5L,0.7L和0.9L处测定直径d_0.1,d_0.3,d_0.5,d_0.7和d_0.9。若将各区分段材积V_i与树干总材积V之比定义为相对干率,则相对干率序列X_i即为:更多还原

【Abstract】 In this paper presented is a new method to describe stem form of trees. A stem could be divided into sections in equal length and volume could be worked out for each section, then "relative stem ratio" (RSR) was defined as the ratio between volume of each section and the total volume of whole stem.This new concept, relative stem ratio, implicates not only volume, but also diameter. RSR could be used as an index of tapering degree, because it was reduced progressively in the direction of stem length. The most important founction of RSR is to denote various forms of tree stems as series of diagram in quite uniform, therefore the changes of stem form and volume structure can obviously seen from the diagram. 8 major species of hardwoods in Changbai Mountain were analysed using this new methodology, the results were coincident wich those obtained from multivariate analysis.更多还原