文献类型：期刊文献

英文题名：Plant material features responsible for bamboo's excellent mechanical performance: a comparison of tensile properties of bamboo and spruce at the tissue, fibre and cell wall levels

作者：Wang, Xiaoqing[1,2,3] Keplinger, Tobias[1,2] Gierlinger, Notburga[1,2] Burgert, Ingo[1,2]

第一作者：Wang, Xiaoqing;王小青

通信作者：Burgert, I[1]

机构：[1]ETH Swiss Fed Inst Technol Zurich, Inst Bldg Mat, CH-8093 Zurich, Switzerland;[2]EMPA Swiss Fed Labs Mat Sci & Technol, Appl Wood Mat Lab, CH-8600 Dubendorf, Switzerland;[3]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2014

卷号：114

期号：8

起止页码：1627-1635

外文期刊名：ANNALS OF BOTANY

收录：;Scopus(收录号：2-s2.0-84922486215);WOS:【SCI-EXPANDED(收录号:WOS:000345825300005)】；

基金：This work was financially supported by the FP7: People Marie-Curie action COFUND and the National Natural Science Foundation of China (31170527, 31370563). We thank the Bundesamt fur Umwelt (BAFU) and Lignum, Switzerland, for financial support of the Wood Materials Science Group at ETH and Empa. The authors would like to thank the reviewers for their comments, which helped to improve the manuscript.

语种：英文

外文关键词：Bamboo; Phyllostachys pubescens; spruce; Picea abies; stem biomechanics; plant cell wall; mechanical adaptation; microfibril angle; Raman imaging; tensile stiffness

摘要：Background and Aims Bamboo is well known for its fast growth and excellent mechanical performance, but the underlying relationships between its structure and properties are only partially known. Since it lacks secondary thickening, bamboo cannot use adaptive growth in the same way as a tree would in order to modify the geometry of the stem and increase its moment of inertia to cope with bending stresses caused by wind loads. Consequently, mechanical adaptation can only be achieved at the tissue level, and this study aims to examine how this is achieved by comparison with a softwood tree species at the tissue, fibre and cell wall levels. Methods The mechanical properties of single fibres and tissue slices of stems of mature moso bamboo (Phyllostachys pubescens) and spruce (Picea abies) latewood were investigated in microtensile tests. Cell parameters, cellulose microfibril angles and chemical composition were determined using light and electron microscopy, wide-angle X-ray scattering and confocal Raman microscopy. Key Results Pronounced differences in tensile stiffness and strength were found at the tissue and fibre levels, but not at the cell wall level. Thus, under tensile loads, the differing wall structures of bamboo (multilayered) and spruce (sandwich-like) appear to be of minor relevance. Conclusions The superior tensile properties of bamboo fibres and fibre bundles are mainly a result of amplified cell wall formation, leading to a densely packed tissue, rather than being based on specific cell wall properties. The material optimization towards extremely compact fibres with a multi-lamellar cell wall in bamboo might be a result of a plant growth strategy that compensates for the lack of secondary thickening growth at the tissue level, which is not only favourable for the biomechanics of the plant but is also increasingly utilized in terms of engineering products made from bamboo culms.