摘要
利用我国南方的杉木实测数据,采用误差变量联立方程组方法,同时建立了胸径一元材积模型、地径一元材积模型和胸径—地径回归模型。结果表明:地径与胸径之间相关紧密,其回归模型的确定系数可以达到0.96以上;地径一元材积模型的预估精度要明显低于胸径一元材积模型。
Based on the data of Chinese fir （ Cunninghamia lanceolata） in southern China, three models, DBH （Diameter at Breast Height ） -based volume model, DRC （Diameter on Root Collar）-based volume model, and DBH-DRC regression model, were constructed using the error-in-variabl~ simultaneous equations approach. The results showed that DBH is closely related to DRC, determination coefficient of the regression is more than 0. 96 ; and the prediction precision of DRC-based volume model is clearly lower than that of DBH-based volume model.
出处
《中南林业调查规划》
2012年第4期1-4,共4页
Central South Forest Inventory and Planning
关键词
一元材积表
地径材积表
胸径-地径回归模型
误差变量联立方程组
杉木
one-way volume table
DRC-based volume table
DBH-DRC regression model
error-in-variablesimultaneous equations
Chinese fir
作者简介
曾伟生（1966-），男，湖南涟源人，博士，教授级高工，主要从事森林资源调查与监测工作。
