摘要
为掌握马占相思人工林立木干形变化的规律性,实测431株样木并采用多个干形指标进行了比较研究.结果表明:实验形数变动系数最小,其变动系数为8.55%;实验形数的调查平均值0.3868,比目前区内使用的阔叶树数值(0.4000)呈一定的偏小;正形数系列中,以1/4树高以下变动系数较小,2/10、1/10树高处形数及胸高形数的变动系数分别是8.69%、10.63%、和9.68%;胸高形数、胸高形率以及树高间呈双曲线关系,相关关系紧密.
<Abstrcat> Based on 431 Acacia mangium plantation felled sample trees, a few stem form factors have been calculated and compared with each other in order to find out the tree stem form regularity. The results are as follows: The coefficient of alteration in experiment form factor is minimum and most steady, its value is 8.55%. The value of experiment form factor averages 0.386 8, which is slightly smaller than the broadleaved tree mean number (0.400 0 ) used in the district at present. The C.A of normal form factor blow 1/4 tree height is relatively less than that of the over-stem position, and the mean number is 8.69%, 10.63%, and (9.68%) respectively for 2/10, 1/10 relative tree height and the breast height. The relationship between breast height form factor, breast height form quotient, and tree height can be significantly expressed as quadratic correlation curve form.
出处
《中南林学院学报》
CAS
CSCD
北大核心
2005年第2期21-24,共4页
Journal of Central South Forestry University
关键词
森林经理
马占相思
正形数
实验形数
正形数
广西
forest mangeement
Acacia mangium
normal form factor
experimental form factor
normal form quotient
Guangxi
