理论造材:削度方程和出材率表的编制

本文提出了计算机理论造材仅根据削度方程和单株带、去皮胸径的转换关系式两个模型,可不必由削度方程推导材长方程和材积比方程。以相关指数、均方误为指标,结合残差图分析,选择了杉木、落叶松的削度方程;结合标准树高曲线,则可仅根据优势高为任一具体林分编制(一元)单株出材率表(特称之为自动调整出材率表)。

Theoretical Bucking:Taper Equations and Merchantable Volume Tables

If taper equation d=f(h, D, H) is constructed, merchantable height could be directly computed without deriving merchantable height equation h=g(d, D, H) from its corresponding taper equation d=f(h, D, H) when bucking with computer. Only the taper equation and the converted equation between DBH outside bark and DBH inside bark are necessary. Taking index of correlation and mean residual of errors for criteria and followed by residual analyses, the taper equation developed by Max and Burkhart in 1976 is chosen for Cunninghamia lanceolata and Larix olgensis. Merchantable volume tables are then constructed. Combining with theoretical height diameter curve, merchantable volume table for any stand can be constructed.