摘要
根据同龄纯林及下层抚育间伐的特点,利用正态分布函数分别得出了伐前林分、间伐木、保留木的算术平均胸径、胸径方差、平方平均胸径及各径阶株数的计算公式。通过实例对预估结果进行了精度计算,结果表明,在株数间伐强度为22%～47%时算术平均胸径、径阶株数、平方平均胸径预估效果都较好,在伐前林分、保留木预估中其精度满足规划调查中相应调查因子允许误差的A类精度要求。
Based on the characteristic of even-aged pure plantation and lower story intermediate cutting, the calcu-lation formulae of mean DBH, DBH variance and square of mean DBH of the stand before intermediate cutting, thinned trees and remained trees, the tree numbers of each diameter class were obtained by using normal distribu-tion function. The precision of the predication results was calculated by applying the examples. The results showed that the predication results of mean DBH , the tree numbers of each diameter class and Dg were better when inter-mediate cutting intensity was between 22 % - 47 %. The predication precision of the stand before intermediate cut-ting and remained trees can satisfy class A precision demand of allowance error of investigation factors in forest in- ventory planning and design.
出处
《西部林业科学》
CAS
北大核心
2013年第1期58-63,共6页
Journal of West China Forestry Science
基金
云南省科技攻关项目(2004NG05-05)
中央财政林技推广[2010]TK62资助
关键词
同龄纯林
下层抚育间伐
直径分布
正态分布
even-aged pure plantation
intermediate cutting of lower storey
diameter distribution
normal distri-bution
