广西桉树和马尾松单木胸径/冠幅-树高模型构建

Individual Diameter-height and Crown-height Prediction Models for Pinus Massoniana and Eucalyptus in Guangxi

以广西壮族自治区的优势树种马尾松和桉树为例,构建单木胸径/胸径-树高模型。借助地面站和无人机激光雷达从不同地形的26块30 m×30 m方形样地中获取各株单木的树高、胸径和冠幅参数,其中马尾松1330株,桉树1499株;利用线性、指数函数、对数函数、幂函数、二次多项式和三次多项式6种林业中常用的数学表达式,构建马尾松、桉树的树高与胸径、冠幅的关系模型。实验结果表明:研究区域马尾松、桉树的树高与胸径、冠幅之间具有显著的相关性,且多项式模型在胸径、冠幅的预测上表现最优,拟合优度R^(2)均在0.6以上。本文结论可为无人机载激光雷达在林业调查中,胸径和冠幅参数不易获取的情况提供参考,并应用于森林碳汇的估算。

This paper takes the dominant species of pinus massonian and eucalyptus in Guangxi Zhuang Autonomous Region as example to build diameter-height and crown-height model of individual tree.With the help of ground station and UAV LiDAR,the tree height,diameter at breast height and crown parameters of each individual tree were obtained from 26 square plots(30 m×30 m)with different terrains,including 1330 pinus massonians and 1499 eucalyptuses.Using six kinds of mathematical expressions commonly used in forestry,it constructs the relationship model between pinus massonian and eucalyptus tree height,diameter at breast height and crown width.The experimental results show that there is a significant correlation between the height of the pinus massonian and eucalyptus in the study area,the diameter at breast height and the crown width,and the polynomial model performs best in the prediction of the diameter at breast height and crown width,and the goodness of fit R 2 is 0.6 or above.The conclusions can provide references for the difficulty of obtaining the parameters of diameter at breast height and crown width in forestry surveys of UAV-borne LiDAR,and can be applied to the prediction of forest carbon sinks.