DOI: 10.1016/j.foreco.2014.09.027
Scopus记录号: 2-s2.0-84908544045
论文题名: Modelling discoloration and duration of branch occlusion following green pruning in Acer pseudoplatanus and Fraxinus excelsior
作者: Dănescu A. ; Ehring A. ; Bauhus J. ; Albrecht A. ; Hein S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 335 起始页码: 87
结束页码: 98
语种: 英语
英文关键词: Branch occlusion
; Green pruning
; Natural branch shedding
; Noble hardwoods
; Wood discoloration
; Wood quality
Scopus关键词: Acer pseudoplatanus
; Branch occlusion
; Fraxinus excelsiors
; Green pruning
; Noble hardwoods
; Wood qualities
; data set
; deciduous forest
; diameter
; pruning
; vigor
; wood quality
; wounding
; Germany
; Acer pseudoplatanus
; Fraxinus excelsior
英文摘要: The production of defect-free, high quality stem wood may be promoted through pruning of branches in hardwood species, yet this practice may also lead to wood defects, such as stem discoloration.Here, models to predict stem discoloration and the time of branch occlusion were developed for Acer pseudoplatanus L. (sycamore maple) and Fraxinus excelsior L. (common ash) based on a pruning experiment in southwest Germany. The dataset consisted of 449 completely occluded branches originating from 115 destructively sampled sycamore maple and common ash trees that had been pruned either in late winter or summer, or had not been pruned and underwent natural branch shedding instead. We analyzed these data with linear and generalized linear mixed-effects models to predict (1) the time until branch occlusion, (2) the length of branch discolorations and (3) the occurrence of discolorations in the stem wood. For all treatments, the time until complete branch occlusion was negatively related to stem radial increment during branch occlusion and positively related to the branch diameter in case of green pruning or the length of the dead branch portion in case of natural branch shedding. The extent of branch discoloration was positively correlated with branch diameter (green pruning) or the dead branch length (natural shedding), which was itself correlated to branch diameter. The probability of stem discoloration after pruning increased with branch diameter and showed large interspecific differences, with a much higher risk for common ash. Thresholds for decay risk based on pruned branch diameters are reported for each species. In both branch and stem discoloration models, there was no evidence of significant effects related to the time of pruning.When analyzing a subset of the original data containing only branches with diameters up to 30. mm, we found that green pruning significantly reduced the duration of branch occlusion. The extent of branch discoloration was positively related to branch diameter and occlusion time and was not affected by pruning treatment or species.Our results indicate that pruning reduces the duration of branch occlusion and, hence, has the potential to increase the proportion of defect-free wood. Furthermore, the duration of branch occlusion after artificial pruning should be minimized in order to reduce the risk of discoloration and decay. Therefore, green pruning should start early in the life of a tree when its branches are still thin and be applied only to vigorous trees that can occlude the wounds rapidly. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65643
Appears in Collections: 影响、适应和脆弱性
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作者单位: Forest Research Institute of Baden-Württemberg, Wonnhaldestr. 4, Freiburg, Germany; Faculty of Environment and Natural Resources, Freiburg University, Tennenbacherstr. 4, Freiburg, Germany; University of Applied Forest Sciences, Schadenweilerhof, Rottenburg am Neckar, Germany
Recommended Citation:
Dănescu A.,Ehring A.,Bauhus J.,et al. Modelling discoloration and duration of branch occlusion following green pruning in Acer pseudoplatanus and Fraxinus excelsior[J]. Forest Ecology and Management,2015-01-01,335