气候变化领域集成服务门户(CCPortal): Impact of species mixture on the stiffness of European beech (Fagus sylvatica L.) sawn timber

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DOI	10.1016/j.foreco.2020.117935
	Impact of species mixture on the stiffness of European beech (Fagus sylvatica L.) sawn timber
	Rais A.; van de Kuilen J.-W.G.; Pretzsch H.
发表日期	2020
ISSN	0378-1127
卷号	461
英文摘要	European beech (Fagus sylvatica L.) is the most commonly occurring deciduous tree species in Central Europe. Because of its competitiveness and (morphological) variability, it occurs in different species mixtures. The aim of the present study was to determine whether, and to what extent, the internal wood properties of European beech are affected by species mixture. Logs obtained from 100 beech trees from the low-mountain Spessart region in Germany were sampled and subdivided into five equal groups representing different mixture types: pure beech stands and four beech stands with the following tree species, respectively: Pseudotsuga menziesii, Picea abies, Pinus sylvestris and Quercus petraea. After logging and sawing, the boards were graded according to strength. For this purpose, the dynamic modulus of elasticity (MOEdyn) was determined. The MOEdyn, which is a relevant property for wood quality in the construction sector, was regressed against various independent variables, such as cambial age or mixture type. Relevant differences in wood quality were observed between mixture types. Beech trees in monocultures had the highest stiffness. In particular, species mixture with the light-demanding Quercus petraea or Pinus sylvestris yielded a significant reduction in the stiffness of the beech timber (–10% and –14%, respectively). Therefore, beech glued laminated timber of higher strength classes (≥GL 40c) was not viable using beech from these mixture types. The findings of this study also revealed significant effects of axial board position and cambial age on MOEdyn. The present transformation of forests into mixed forests affects the quality of the wood. Future research should focus on the dependencies between varying growth conditions—also caused by climate change—and wood formation. © 2020 Elsevier B.V.
关键词	Climate change Construction industry Elastic moduli Grading Hardwoods Mixtures Stiffness Timber Dynamic modulus of elasticity Mixed stands Pure stands Strength grading Wood density Forestry competitiveness coniferous forest coniferous tree deciduous tree growth morphology stand structure timber wood wood quality Dynamic Tests Elastic Strength Hardwoods Mixed Stands Mixtures Stiffness Wood Density Germany Hesse Spessart Fagus Fagus sylvatica Picea abies Pinus sylvestris Pseudotsuga menziesii Quercus petraea
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132942
推荐引用方式 GB/T 7714	Rais A.,van de Kuilen J.-W.G.,Pretzsch H.. Impact of species mixture on the stiffness of European beech (Fagus sylvatica L.) sawn timber[J]. Forest Ecology and Management,2020,461.
APA	Rais A.,van de Kuilen J.-W.G.,&Pretzsch H..(2020).Impact of species mixture on the stiffness of European beech (Fagus sylvatica L.) sawn timber.,461.
MLA	Rais A.,et al."Impact of species mixture on the stiffness of European beech (Fagus sylvatica L.) sawn timber".461(2020).