四参数柱干比曲线式应用研究  

Research on Application of Four-parameter Cylinder-volume-ratio Stem Profile

作　　者：孟宪法[1] 李悦黎[2] 张方秋[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520 [2]西北农林科技大学林学院,陕西杨陵712100

出　　处：《林业科学研究》2001年第1期95-99,共5页Forest Research

摘　　要：The study involved estimating stem volume, calculating merchantable volume yielding rate and timber assortments volume with four parameter cylinder volume ratio stem profile. The result shows it performs better than Schumarher Hall at estimating stem volume when the data from Quercus aliena were classified by class. Compared with taper function at calculating merchantable volume yielding rate, four parameter cylinder volume ratio stem profile also performs well with systematic error below 1% and mean square error below 5%. To Pinus tabulaeformis trees, taper function has better accuracy degree than cylinder volume ratio method, but the result is contrary to Q.aliena. When calculating timber assortments volume with four parameter cylinder volume ratio method, systematic error is below 6% and mean square error below 19%.The study involved estimating stem volume, calculating merchantable volume yielding rate and timber assortments volume with four parameter cylinder volume ratio stem profile. The result shows it performs better than Schumarher Hall at estimating stem volume when the data from Quercus aliena were classified by class. Compared with taper function at calculating merchantable volume yielding rate, four parameter cylinder volume ratio stem profile also performs well with systematic error below 1% and mean square error below 5%. To Pinus tabulaeformis trees, taper function has better accuracy degree than cylinder volume ratio method, but the result is contrary to Q.aliena. When calculating timber assortments volume with four parameter cylinder volume ratio method, systematic error is below 6% and mean square error below 19%.

关 键 词：四参数柱干比曲线式 体积 出材率 规格材出材量 测树学 相对干形 正形数 

分 类 号：S758.3[农业科学—森林经理学] S711[农业科学—林学]