基于地基激光雷达的栾树分形特征分析

Fractal Characteristics of Koelreuteria paniculata on Ground-based LiDAR

分枝结构的几何特征是树木分枝按照一定规律组合而成的形态,体现了个体树木在生理、生态角度对于环境的适应能力,以及对光、水、养分、空间等生长影响因子的竞争能力,是生态领域研究的一个重要内容。地基激光雷达(Terrestrial Laser Scanning, TLS)技术的发展为获取单木结构的参数提供了一种便捷、无损的绿色方式。本文使用基于TLS点云的方法来代替耗费大量人力的方式来获取树木分枝的结构参数,并进行分形特征的分析,发现在栾树的生长发育阶段,为了充分利用光照条件和生长空间,随着DBH的增加,分枝率和枝径比同步上升,但分枝角度呈先上升后下降的趋势。

The geometric characteristics of tree meristems describes the structures that branches form according to certain laws.It reflects the adaptability of individual tree to the environment,and the competitive power to factors that affect growth such as light,water and growth space.The advancement of Terrestrial Laser Scanning(TLS)technology has made it possible to obtain parameters of single wood constructions in a convenient,non-destructive,and environmentally friendly manner.In this study,we used TLS point cloud based method instead of original labor-intensive methods to estimate structural parameters of tree branches,and perform further analysis of fractal characteristics.The results showed that to make better use of light and growth space during the growth stage,branching ratio and branch diameter ratio rised synchronously as DBH icreasd,while branching angles increased first,and then decreased。