基于TLS引入局部密度因子的落叶松削度方程构建  

Construction of Taper Equation for Larix olgensis Using Local Density Factor Based on TLS

作　　者：张少秋 贾炜玮[1] 李丹丹[1] ZHANG Shaoqiu;JIA Weiwei;LI Dandan(College of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《森林工程》2024年第5期1-7,共7页Forest Engineering

基　　金：国家重点研发计划项目(2023YFD2200802);中央高校基本科研业务费专项资金项目(2572019CP08)。

摘　　要：将局部密度因子引入削度方程,通过地基激光雷达对黑龙江省佳木斯市桦南县孟家岗林场5块落叶松人工林进行扫描,采集的点云数据用于提取落叶松树高、胸径以及不同相对高度处直径,基于Kozak可变指数削度方程构建引入局部密度因子的削度方程,削度方程拟合结果为调整决定系数R^(2)_(adj)=0.935,均方根差RMSE=0.7356,平均偏差Bias=0.8693。研究表明,引入局部密度因子的削度方程具有良好的拟合精度;对比传统Kozak削度方程和引入全局密度因子的削度方程,引入局部密度因子的削度方程拟合效果更好;落叶松的削度方程其局部密度因子的计算范围与树高和胸径呈正相关。试验结果可以为孟家岗林场科学合理的造材提供理论依据,初步揭示了局部密度因子对于落叶松树干干形的影响。By introducing the local density factor into the taper equation,five Larix olgensis plantations in Mengjiagang Forest Farm,Jiamusi City,Heilongjiang Province,were scanned by TLS.The tree height,diameter at breast height and diameter at different relative heights of Larix olgensis were extracted from the collected point cloud data.Based on Kozak variable exponential taper equation,a taper equation with local density factor was constructed,and the fitting result was R^(2)_(adj)=0.935,RMSE=0.7356,Bias=0.8693.The research showed that:the taper equation model with local density factor had good fitting accuracy,Compared with the traditional Kozak taper equation model and the taper equation model with global density factor,the taper equation model with local density factor had better fitting effect.The calculation range of the local density factor of the Larix olgensis taper equation was positively correlated with tree height and diameter at breast height.The experimental results can provide a theoretical basis for scientific and reasonable timber production in Mengjiagang Forest Farm,and preliminarily reveal the influence of local density factor on the trunk shape of Larix olgensis.

关 键 词：落叶松人工林 地基激光雷达 削度方程 局部密度因子 邻域 

分 类 号：S757.9[农业科学—森林经理学]