胸高圆锥系数和新绝对形数的研究  被引量:6

A Study on the Coefficient of Cone of Breast Height and New Absolute FormFactor

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作  者:吴纪昌 李铁民[1] 孙拖焕[1] 杨静[1] 

机构地区:[1]山西省林业勘测设计院,山西省林业科学研究所,山西省林业厅

出  处:《山西林业科技》1997年第4期1-5,共5页Shanxi Forestry Science and Technology

摘  要:胸高圆锥系数(f1.3CC是笔者提出的一种新的树木干形指标,它避免了正形数测算中的累赘,又克服了胸高形数随树高增长而减小的弊端。用它可以科学地论证实验形数的可靠性,是研究干形的学者高效的运算工具。胸高圆锥系数是树干材积与一个圆锥体体积的比值,这个圆锥体与树干具有相同的胸高直径和高。该系数可由胸高形数和树高根据一个简单函数求出。新绝对形数的比较圆柱体的高等于树高,其底面直径根据胸径和解析木各区分段中央与胸高断面之间树干削度的加权平均值来推算。新绝对形数可以由胸高圆锥系数求出,因为二者之间存在极紧密的相关关系。Coefficient of Cone of Breast Height(f1.3CC)is a new stem form index developed by the authors,which hasnt cumbers in measure as normal formfactor does,hasnt the disadvantage the breastheight formfactor has of decreasing as the trees growing in height.The coefficient can successfully prove the reliability of experimental formfactor,and can be used as a highefficient means to study tree stem form.The coefficient f1.3CC is defined as a ratio of stem volum to the volume of a cone with the same diameter at breast height and the same height as the tree,and can calculate from f1.3 and tree height through a simple function.The New Absolute Formfactor(f0(n))s standard cylinder has a same height as the tree and a basal diameter based on d.b.h and the weighted average of tapper values of stem segments from breast height to the middle of every 1m or 2m segments in stem analysis.The f0(n) can obtain from f1.3CC by a function as there is a close relation between the two factors.

关 键 词:形数 胸高圆锥系数 新绝对形数 实验形数 树木 

分 类 号:S758[农业科学—森林经理学]

 

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