滇西南巨尾桉人工林林木根径与胸径的相关关系研究

高德祥; 韦文长

文章摘要

高德祥,韦文长.滇西南巨尾桉人工林林木根径与胸径的相关关系研究[J].林业调查规划,2022,(3):32-39

滇西南巨尾桉人工林林木根径与胸径的相关关系研究

Correlation between Root Diameter and Diameter Breast Height of Eucalyptus grandis×E.urophylla Plantation in Southwest Yunnan

DOI：

中文关键词: 巨尾桉根径胸径数学模型拟合评价适用性检验一元材积表

英文关键词: Eucalyptus grandis×E.urophylla root diameter diameter breast height mathematical model fitting evaluation applicability test unitary volume table

基金项目:云南省临沧市科技创新人才培养项目（202004AC100001-B14）

作者	单位
高德祥	云南省林业调查规划院，云南昆明 650051
韦文长	双江县林业和草原局，云南双江 677399

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中文摘要:

为研究巨尾桉人工林根径和胸径的相关关系，解决森林资源管理工作中通过伐桩测算立木蓄积量的实际问题，选取138株树干通直圆满、无分杈的巨尾桉人工林样木，分别用于编表样本（103株）和检验样本（35株）。采用模型优选法，以线性方程、对数方程、二次方程、三次方程和幂函数5个数学模型作为备选模型，以离差平方和（SSR）、相关指数（R²）、总相对误差（RS）、相对误差平均值（REA）、相对误差绝对值平均值（REAA）和残差(SR)分布图作为模型的评价指标，使用103株编表样本数据进行拟合评价和适用性检验。结果表明，三次方程：D=3.082534+0.080122DR+0.046354DR²-0.000920DR³，适合作为巨尾桉根径-胸径数学模型，适用于双江县巨尾桉人工林。研究编制的巨尾桉一元材积表：V=0.056922-0.016103D^＾sub>i+0.001738D^＾_i²-0.000015D^＾_i³，通过适用性检验，达到了精度要求，可以在生产中使用。

英文摘要:

In order to study the correlation between root diameter and DBH of Eucalyptus grandis×E. urophylla and solve the actual problem of measuring standing wood stock through pile logging in forest resource management, 138 artificial forest trees with perfect trunk, straight and complete and without branches were selected, and 103 samples and 35 test samples were compiled. Using the model optimization method, five mathematical models, including linear equation, logarithmic equation, quadratic equation, cubic equation, and power function, were used as alternative models. The sum of deviation squared (SSR), correlation index （R²）, total relative error (RS), relative error mean (REA), relative error absolute value mean (REAA), and residual (SR) distribution plots were used as evaluation indicators for the model. Fitting evaluation and applicability tests were performed using catalog sample data from 103 strains. The results showed that the cubic equation: D=3.082534+0.080122DR+0.046354DR²-0.000920DR³ was suitable as a mathematical model of root diameter-diameter breast height of Eucalyptus grandis×E.urophylla, which was suitable for Eucalyptus grandis×E.urophylla plantation in Shuangjiang County. The unitary volume table of V=0.056922-0.016103D^＾sub>i+0.001738D^＾_i²-0.000015D^＾_i³passed the accuracy test and could be used in production.

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