文献类型：期刊文献

英文题名：Anatomical characteristics, microfibril angle and micromechanical properties of cottonwood (Populus deltoides) and its hybrids

作者：Wang, Yurong[1,2] Liu, Cangwei[1] Zhao, Rongjun[1] McCord, Jessica[2] Rials, Tim[2] Wang, Siqun[2]

第一作者：Wang, Yurong;王玉荣

通信作者：Wang, SQ[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Univ Tennessee, Ctr Renewable Carbon, Knoxville, TN 37996 USA

年份：2016

卷号：93

起止页码：72-77

外文期刊名：BIOMASS & BIOENERGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000382541000010)】；

基金：The authors would like to gratefully acknowledge financial support from the Chinese National Natural Science Foundation (No. 31370562), the China Scholarship Council (CSC), from the USDA Agriculture and Food Research Initiative Competitive Grant (2011-68005-30410), and the State Key Laboratory of the Chinese Academy of Forestry Foundation (CAFYBB2012044). Thanks also go to the following: Mr. Xinzhou Wang of the Center for Renewable Carbon (CRC) for the technical help regarding the nanoindentation test, Mr. Lichao Jiao of Research Institute of Wood Industry, Chinese Academy of Forestry for the technical help regarding the microstructure observation, Ms. Anna Kim and Ms. Choo Hamilton of CRC of the Univ. of Tennessee for sample sawing.

语种：英文

外文关键词：Poplar; Growth rate; Microstructure; Microfibril angle; Micromechanical property

摘要：Samples were prepared using stem xylem from cottonwood (Populus deltoides) and two cottonwood hybrids (P. deltoides x Populus maximowiczii and P. deltoides x Populus trichocarpa), which grew in Tennessee, United States. The anatomical characteristics, microfibril angle, and mechanical properties of the cell wall in juvenile wood (two-year-old) were investigated by means of microscopy image analysis system, X-ray diffraction, and nanoindentation (NI). The results showed that the double-wall thickness of the fiber cells in the hybrid poplars was thicker than that of the pure poplar, and the ratio of wall to lumen of fiber cell (0.40) of the P. deltoides x P. trichocarpa, which had the slowest growth rate, reached the greatest value among the three poplar clones. Their microfibril angles (MFA) of the cell wall in the investigated samples ranged between 11.5 degrees and 16.7 degrees, and they correlated positively with growth rates of the three poplar clones. The average hardness and reduced elastic modulus were 0.25 GPa and 8.58 GPa for P. deltoides, 0.28 GPa and 8.34 GPa for P. deltoides x P. maximowiczii, and 0.31 GPa and 12.2 GPa for P. deltoides x P. trichocarpa, respectively. P. deltoides x P. trichocarpa with the slowest growth rate had the greatest micromechanical values among the three poplar clones. In combination with growth characteristics of the three poplar clones, the findings of the analyses on their wood properties provided information-rich data that not only could describe juvenile wood properties but also could be used in selective breeding for the three poplar clones in Tennessee, USA. (C) 2016 Published by Elsevier Ltd.