海南省主要人工林树种树高一元材积模型构建

Individual Stem Volume Modeling Based on Tree Height for Main Plantation Tree Species in Hainan

以海南省5个主要人工林树种为研究对象,分别采用直接建立树高一元材积模型和二阶回归估计的方法,同时与胸径一元材积模型进行比较,结果表明:在立木材积与单一因子的相关性中,胸径最为紧密,树高次之;由于树高受立地质量影响较大,树高一元材积模型很难满足现行的立木材积表编制技术规程的要求;受树高―胸径模型的精度限制,利用二阶回归估计方法建立的树高一元材积模型难以提高模型预估精度;从模型自变量的选择和样本组织角度,提出了提高模型预估精度的方向。

In this paper, to provide measurement basis and technical support for accurate estimation of tree volume by using laser radar technology, 5 main plantation trees in Hainan province were taken as the research objects. The model method of tree height one-way volume and two-order regression estimation were adopted respectively. The results showed that DBH was the most efficient explanatory variable for volume model, followed by the tree height. Just because the height of the tree is greatly influenced by the site quality, the tree height one-way volume model is difficult to meet the requirements of the current technical regulations for the establishment of the standing timber table. It is difficult to improve the accuracy of model prediction by establishing the tree height one-way volume model by using the two order regression estimation method. Finally the direction of improving prediction accuracy is proposed from the aspects of model independent variables selection and sample organization.