期刊
FOREST ECOLOGY AND MANAGEMENT
卷 380, 期 -, 页码 212-223出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.foreco.2016.09.003
关键词
Voxel; TLS; Canopy; Structure; Vertical
类别
资金
- DFG (German Science Foundation) Priority Program 1374 Infrastructure-Biodiversity-Exploratories [Am 149/16-2, Se 2383/2-1, Se 2383/1-1]
The relevance of stand structural heterogeneity for biodiversity conservation is increasingly recognized and efficient tools for its measurement are demanded. Here, we quantified forest structure by calculating the effective number of layers (ENL) for different Hill Numbers (0D, 1D, 2D) as a measure of vertical structure of a subplot. We than use sampling techniques to cover the horizontal structural variability within study plots. ENL describes the vertical structure based on the occupation of 1 m wide vertical layers by tree components relative to the total space occupation of a stand. Space occupation was quantified by a voxel-model obtained from terrestrial laser scanning (TLS) on 150 forest plots in Germany. We used a single scan approach, which requires less field work and post-processing compared to multiple-scans. Single-scan derived mean ENL and its coefficient of variation successfully differentiated forest structures over a wide range of even-aged, uneven-aged and unmanaged broadleaved and coniferous stands. ENL was correlated to the stand summary measures basal area, quadratic mean diameter and stem density as well as stand age. ENL can be used to describe structural heterogeneity and proved to be efficiently assessable by TLS. (C) 2016 Elsevier B.V. All rights reserved.
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