中南林业科技大学学报2025，Vol.45Issue(4)：65-75,11.DOI:10.14067/j.cnki.1673-923x.2025.04.006
基于TLS的长白落叶松人工林树冠体积模型
Crown volume model for Larix olgensis plantation based on TLS
摘要
Abstract
[Objective]Tree crown is an important indicator to measure tree vitality,and the development of a crown volume model can provide a theoretical basis for the management and optimization of the crown structure of stands.[Method]Based on the point cloud data obtained by the terrestrial laser scanner(TLS),individual tree information was extracted,including DBH,tree height,crown width,crown length,and crown volume,from the point cloud data obtained by Larix olgensis plantation.K-means cluster analysis was used to divide the trees into three grades:dominant trees,average trees,and pressed trees,and set them as dummy variables into the crown volume prediction model.The generalized crown volume model was constructed by incorporating covariates by the reparameterization method,and the response of crown volume to the gradient of crown size,competition intensity and structural diversity was simulated.[Result]The K-means cluster analysis method could objectively describe the differences in crown volume between different growth dominances.The results of the ten-fold cross-test show that the larch crown volume model,including tree classification,individual tree,and stand variables,has robust prediction ability,and its accuracy meets the applicable standards of forestry work.The crown volume of larch increased with the increase in crown width,crown length,and tree height and decreased with the increase in stand mean DBH and Gini coefficient of DBH.[Conclusion]This study revealed the relationship between tree size,crown factor,stand structure diversity,intraspecific competition and canopy volume by establishing a canopy volume model,which provided a reference for the optimal management of plantation crown.关键词
长白落叶松人工林/树冠体积模型/哑变量/林木分级/林分结构多样性/地基激光扫描Key words
Larix olgensis plantation/crown volume model/dummy variables/tree classification/stand structural diversity/terrestrial laser scanning分类
农业科技引用本文复制引用
沈玉曦,田栋元,姜立春..基于TLS的长白落叶松人工林树冠体积模型[J].中南林业科技大学学报,2025,45(4):65-75,11.基金项目
国家自然科学基金项目(32271866). （32271866）
