摘要
以广西速生丰产桉树人工林719块样地数据为基础,通过优选模型结构,以模型本身为权函数进行加权最小二乘法求解模型参数,研究建立了速生丰产桉树人工林二元胸高形数模型。经检验,模型用于林分蓄积估计的总相对误差和平均相对误差均在±2.0%以内,小于规定的±3%;模型总体预估精度达99%以上,大于规定的97%;满足林业数表建模要求。
Based on the data of 719 sample plots of Eucalyptus plantations in Guangxi, a form-factor model for Eucalyptus plantations is established. The result of goodness test of the model shows that the total relative error and the mean relative error for forest stand volume estimation are between ±2.0 %, less than the permission of ±3 %,and the precision of estimates is up to 99 %, more than the permission of 97 %.
出处
《中南林业调查规划》
2008年第1期6-10,共5页
Central South Forest Inventory and Planning
基金
广西"十五"林业科技攻关项目(2002-54)
