研究目的
To measure the orientation of leaves in a mature hemiboreal mixed broadleaf stand using the high-density point cloud of terrestrial laser scanner hits and to provide parameters of beta distribution and elliptical distribution for the approximation of empirical distributions.
研究成果
Terrestrial laser scanners and freely available software for analyzing TLS point clouds make it possible to measure leaf angle distribution (LAD) in forests. LAD in tree crowns varies from species to species and depends on the depth in the crown layer. Parameters of two-parameter beta distribution and elliptical distribution are provided to describe actual foliage orientation in aspen-, birch-, alder-, lime-, and maple-tree crowns in the hemiboreal zone.
研究不足
The study was limited to a specific forest stand and may not be representative of all broadleaf forests. The manual removal of laser hits to stems and boughs from the point cloud is tedious and could introduce subjectivity. The correction for the projection angle in the analysis of leaf normals is based on an empirical constant, which may not be universally applicable.
