Background: Wood density is considered to be the most important predictor of wood quality but despite its importance, diffuse-porous tree species have been the subject of only a limited number of studies. The importance of European beech forests for Central Europe calls for profound research to examine the potential impact of a warmer climate on the quality of beech timber.Methods: In this study we analysed the influence of tree-ring width and tree-ring age on the wood density of beech,and whether the wood density response to these two parameters is modified by aspect. A linear mixed-effects model for wood density was constructed for mean density data measured with high frequency densitometry on stem discs from 72 beech trees sampled from two different aspects(northeast-NE and southwest-SW) of a valley in southwestern Germany.Results: Part of the variability of mean annual wood density was explained by cambial age: an increase in cambial age resulted in an increase in mean wood density. Tree-ring width and aspect had only a small influence on wood density.Wood density on the SW aspect was lower than on the NE with a difference of approximately 0.006 g/cm3. The between-tree variability was very high.Conclusions: The significant interaction between cambial age and aspect reflects the importance of site conditions at older tree ages: with increasing cambial age the difference between aspects becomes stronger. Our results give a better understanding of the importance of site conditions on the wood quality of beech.
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机译:背景:木材密度被认为是最重要的木材质量预测指标,但尽管它很重要,但散孔树种仅是有限研究的主题。欧洲山毛榉森林对中欧的重要性要求进行深入的研究,以研究气候变暖对山毛榉木材质量的潜在影响。方法:在这项研究中,我们分析了树木年轮宽度和树木年轮龄对山毛榉木材品质的影响。山毛榉的木材密度,以及木材密度对这两个参数的响应是否按方面进行了修改。针对德国西南两个山谷(东北-东北和西南西南)采样的72棵山毛榉树的茎圆盘上的高频密度法测量的平均密度数据,构建了木材密度的线性混合效应模型。结果:年平均木材密度的部分可变性由冈比亚年龄解释:冈比亚年龄的增加导致木材平均密度的增加。树木年轮的宽度和长宽比对木材密度的影响很小,西南侧的木材密度低于东北侧,相差约0.006 g / cm3。树木间的变异性非常高。结论:冈比亚年龄与坡向之间的显着相互作用反映了树龄较大时立地条件的重要性:随着冈比亚年龄的增加,坡向之间的差异变得更强。我们的结果更好地了解了工地条件对山毛榉木材质量的重要性。
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