| 摘要: |
| 采用零距拉伸方法，研究了4株长白落叶松早材管胞的纵向拉伸强度株内变异性及主要影响因素。结果表明，长白落叶松早材管胞纵向拉伸强度均值为373.69 MPa，早材管胞纵向拉伸强度年轮内和株内纵向的变异差异不显著，径向的变异在0.01水平上显著。通过对水分、微纤丝角和密度等因素的研究表明，早材管胞的纵向抗拉强度随着微纤丝角的增大而减小，气干态和饱水态的管胞纵向抗拉强度在0.05水平差异显著，早材管胞纵向抗拉强度与气干密度在0.01水平具有显著的相关性，相关系数为0.861。 |
| 关键词: 长白落叶松 零距拉伸 早材 管胞抗拉强度 |
| DOI：CNKI：34-1162/S.20111226.1620.021 |
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| 基金项目:中国林业科学研究院基本科研业务费专项资金(CAFINT2009C07), 国家自然基金重点项目(3073006)和中国林业科学研究院基本科研业务费专项资金（CAFYBB2008008）。 |
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| Research on longitudinal tensile strength of Larix olgensi earlywood tracheids |
| SHAO Ya-li,XING Xin-ting,YU Yan,ZHAO Rong-jun,AN Zhen |
| (Research Institute of Wood Industry CAF, Beijing 100091; College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010010;International Center for Bamboo and Rattan, Beijing 100102) |
| Abstract: |
| In this paper，the zero-span tension technique was used to rapidly estimate the longitudinal tensile strengths’ variability and main impact factors of tracheids of Larix olgensi plantation wood. It was found that the longitudinal tensile strength of earlywood tracheids has significant variation in radial at 0.01, and has no significant variation in longitudinal and in a ring. The tensile strength of earlywood tracheids of Larix olgensi decreased as MFA increased. The effect of moisture content on the tensile strength of tracheids has significant variation at 0.05 level, and the strength at air dry state is higher than that under water saturation state, and wood air-dry density has positive relationship with tension strength at 0.01 level with correlation coefficient of 0.861. |
| Key words: Larix olgensi zero-span tension earlywood tensile strength of tracheids |
