DOI: 10.1016/j.foreco.2015.12.024
Scopus记录号: 2-s2.0-84951336296
论文题名: Canopy gaps affect the shape of Douglas-fir crowns in the western Cascades, Oregon
作者: Seidel D. ; Ruzicka K.J. ; Puettmann K.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 363 起始页码: 31
结束页码: 38
语种: 英语
英文关键词: Complexity
; Forest management
; Terrestrial laser scanning
; Tree crown
Scopus关键词: Biodiversity
; Laser applications
; Steel beams and girders
; Surface analysis
; Surveying instruments
; Complexity
; Small-scale heterogeneity
; Spatial variability
; Structural diversity
; Structural variability
; Terrestrial laser scanning
; Tree crowns
; Vertical structures
; Forestry
; Pseudotsuga
; Pseudotsuga menziesii
英文摘要: Silvicultural regimes that aim at an increased stand structural diversity typically promote small-scale heterogeneity in horizontal and vertical structures, e.g. through the creation of gaps. We used terrestrial laser scanning (TLS) to investigate impacts of altered growing conditions on trees adjacent to artificial gaps as compared to responses of trees in a regularly spaced, thinned forest interior. Based on the TLS-based point clouds we calculated a number of structural tree crown properties that were hypothesized to be sensitive to spatial variability in growing conditions. We found several significant differences between structural properties of trees in the two growing conditions. Compared to trees in regular spacing, border trees near gaps had a lower crown base height (CBH) and a lower height of maximum crown projection. Crown surface area and crown volume of border trees were significantly larger than those of trees growing in a regular spacing. Also, the asymmetry of entire tree crowns of border trees, and in particular of the lower third of crowns, was directed towards the gap center, reflecting the increased light level in the gap. Our results raise concerns that the economic value of border trees is negatively affected by gap creation. These trees had shorter branch free boles and additionally, due to horizontal branch elongation, larger knots. Conversely, the overall increase in structural variability contributed by the border trees in stands with artificial gaps is likely to positively affect several ecosystem functions as well as biodiversity. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65064
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Ecosystems and Society, College of Forestry, Oregon State University, Richardson Hall, Corvallis, OR, United States; Bureau of Land Management, Salem District Office, Cascades RA, 1717 Fabry Road SE, Salem, OR, United States
Recommended Citation:
Seidel D.,Ruzicka K.J.,Puettmann K.. Canopy gaps affect the shape of Douglas-fir crowns in the western Cascades, Oregon[J]. Forest Ecology and Management,2016-01-01,363