摘要
本文采用相对形率法编制出了山杨与红桦立木相对形率表与立木绝对削度表。山杨从9个d_(0.1)预估模型中选用了模型(2),系统误差<±0.081%,均方差<2.604%。红桦选用了模型(4),系统误差<±0.272%,均方差<2.418%,其拟合与检验精度均较高。
The relative quotient table and absolute taper table of stand- ing tree were constructed by using relative quotlent method in this paper. The model 2 of nine d_(0.1) models was selected for P.davidiana.The syst- ematic error was<±0.08% and the mean square deviation was<2.604%. The model 4 was selected for Butula albo-sinensis.The systematic error and mean square deviation were less than ±0.272% and 2.428%,respectively. The fitting was much better and testing precision was quite higher.
出处
《陕西林业科技》
北大核心
1991年第2期58-64,共7页
Shaanxi Forest Science and Technology
关键词
山杨
红桦
立木
削度表
相对形率法
standing tree
taper table
Populus davidiana
Butula albosinensis
