同龄纯林下层抚育间伐后林分直径分布数字特征值的预估研究  

Predication of Numerical Characteristic Value of Diameter Distribution after Lower Story Intermediate Cutting on Even-aged Pure Plantation

作　　者：刘永刚[1] 童清 刘云彩[1] 冯弦[1] 杨华景 付强 张荃 李万里 

机构地区：[1]云南省林业科学院,云南昆明650201 [2]普洱市林业科学研究所,云南普洱665000 [3]普洱市林业局,云南普洱665000

出　　处：《西部林业科学》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

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.

关 键 词：同龄纯林 下层抚育间伐 直径分布 正态分布 

分 类 号：S753[农业科学—森林经理学]