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Wood properties and chemical composition of the eccentric growth branch of Viburnum odoratissimum var. awabuki

机译:香荚兰(Viburnum odoratissimum var)偏心生长分支的木材特性和化学成分。淡水

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To clarify the wood properties and chemical composition of branches of Viburnum odoratissimum produced by unusual eccentric growth, we investigated growth strain (GS), basic density (D b), microfibril angle (MFA), elastic moduli (E L and E L/D b), creep deformation, cellulose crystalline features, and lignin structure in upper and lower sides of the branches, and considered the correlations among these factors. In most measuring positions, the distribution of GS showed that higher tensile GS was in the upper side and compressive GS was in the lower side of the branch, which combines GS features of reaction wood. However, the generation of GS in the lower side was different from that in compression wood, because E L/D b and MFA had a negative correlation. The creep compliance curves show that the upper-side wood had low rigidity and high viscosity, whereas the lower-side wood had large rigidity and low viscosity. Relative creep had a negative relation with MFA in the upper side, which is unusual. The cellulose crystalline features showed no obvious difference between both sides of the branch; however, the lignin with less β-O-4 proportion and less S units but more G units seemed to exist in the lower side because of a decreased syringyl/guaiacyl (S/G) molar ratio. This suggests that cell wall could be reinforced by lignin resulting in lower viscosity in the lower side of the branch. Additionally, the S/G ratio showed a relatively high correlation with GS in the lower side. These results suggest that lignin structure plays an important role in adapting to environmental changes during eccentric growth for V. odoratissimum.
机译:为了阐明异常偏心生长产生的香荚兰的木材特性和化学组成,我们研究了生长应变(GS),基本密度(D b ),微纤丝角(MFA),弹性模量( E L 和E L / D b ),蠕变变形,纤维素晶体特征和分支上部和下部的木质素结构,并考虑了这些因素之间的相关性。在大多数测量位置,GS的分布表明较高的拉伸GS位于分支的上侧,而压缩GS位于分支的下侧,这结合了反应木材的GS特性。但是,由于E L / D b 与MFA呈负相关,下侧GS的生成与压缩木材中的不同。蠕变柔度曲线表明,上层木材具有低刚度和高粘度,而下层木材具有大的刚度和低粘度。相对蠕变与上部的MFA呈负相关,这是不寻常的。纤维素的结晶特征在分支的两侧之间没有明显的差异。然而,由于丁香基/愈创木基(S / G)的摩尔比降低,下侧似乎存在具有更少β-O-4比例和更少S单元但更多G单元的木质素。这表明木质素可以增强细胞壁,导致分支下侧的粘度降低。另外,S / G比与下侧的GS表现出较高的相关性。这些结果表明木质素结构在V.odoratissimum的离心生长过程中在适应环境变化中起着重要作用。

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