滇西北高山松根径与胸径相关性模型比选研究
Comparison and Selection of Correlation Models between Root Diameter and Breast Height Diameter of Pinus densata in Northwest Yunnan
解开宏 1宋永俊 2牛红玉 2冷鸿天2
作者信息
- 1. 云南省林业调查规划院营林分院,云南 昆明 650021
- 2. 云南省林业调查规划院,云南 昆明 650051
- 折叠
摘要
在滇西北调查高山松样木总株数862株,有效样木824株,系统抽取建模样木 618 株,检验样木206 株.选用10 种一元线性或非线性回归方程,拟合各胸径D与根径DR模型参数,并进行了适用性检验.结果表明,模型D=-2.710 599+0.938 673DR-0.000 911DR2,离差平方和(SSR)值相对较小、总相对误差(RS)为 0、相关系数(R2)0.987、预估精度 99.44%,残差图以横轴为中心分布最为均匀随机,模型参数变动系数最大值为 32.3%,说明模型稳定.检验样本实测值和估计值没有显著差异,该模型最优.
Abstract
A total of 862 Pinus densata sample trees were surveyed in northwest Yunnan,including 824 effective sample trees.618 modeling sample trees were systematically extracted,and 206 inspection sam-ple trees were tested.10 univariate linear or nonlinear regression equations were selected to fit the model parameters of breast height diameter D and root diameter DR,and their applicability was tested.The re-sults showed that the model D=-2.710599+0.938673DR-0.000911DR2 had a relatively small sum of squared deviations(SSR)value,a total relative error(RS)of 0,a correlation coefficient(R2)of 0.987,an estimation accuracy of 99.44%,the residual plot was most uniformly and randomly distributed around the horizontal axis,and the maximum coefficient of variation of model parameters was 32.3%,in-dicating the stability of the model.There was no significant difference between the measured and esti-mated values of the test sample,indicating that the model was optimal.
关键词
高山松/根径/胸径/相关性模型比选/滇西北Key words
Pinus densata/root diameter/breast height diameter/comparison and selection of correlation models/northwest Yunnan引用本文复制引用
基金项目
云南省林业和草原局"云南省"十四五"林业数表适用性检验与修编财政资金支持项目()
云南省科技厅2023年第二批科技成果转化专项资金(530000231100001753720)
出版年
2024
NETL
NSTL
万方数据