用度量误差模型方法建立油松树高曲线方程组

Constructing Height-diameter Curve Equations with Measurement Error Models for Chinese Pine Stands

根据一类清查数据,以Richards方程为基础,采用度量误差模型方法,建立油松林分相容性树高曲线方程组。结果表明：模型在0.05的水平上检验显著,对树高、胸径的预估精度分别为96.12%、96.53%;胸径生长的速生期滞后于树高生长的速生期,树高生长极盛期的林龄为20~30 a,胸径生长极盛期的林龄为30~40 a;胸径为5~10 cm时,树高生长最快,此后逐渐变缓;树高曲线与林分胸径、树高生长过程曲线之间具有相容性和一致性。

According to forest continuous inventory data of Chinese pine, based on Riehards equations, we used modeling meth- ods with measurement error to eonstrnet compatible system of equations for height-diameter curve of the stands. All models were significant at 0.05 level, and the accuracies were 95.73% and 96.44% for estimating average height and average DBH, respectively. With the development of Pinus tabulaeformis stand age, rapid growing period of average DBH comes af- ter that of average height with that of average DBH at 30-40 years and that of average height at 20-30 years. The growth of average tree height was fast, while the DBH was about 5-10 era, then decreased gradually. Tree height-diameter curve, average diameter-age curve and average height-age eurve could keep compatible and consistent.