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为了评价长白落叶松木材作为纸浆材的管胞力学强度,采用单纤维拉伸技术开展了长白落叶松早晚材单根管胞拉伸力学性能研究。结果表明,长白落叶松早材单根管胞拉伸弹性模量、拉伸强度、断裂伸长率的均值分别为9.64 GPa、714.05 MPa及6.01%,晚材的均值分别为12.74 GPa、963.85 MPa、和8.60%。方差分析表明长白落叶松早晚材间单根管胞拉伸弹性模量、拉伸强度和断裂伸长率存在极显著差异(0.01水平),晚材单根管胞力学性能显著高于早材;单根管胞弹性模量和拉伸强度在径向年轮间的变异极显著(0.01水平),断裂伸长率在年轮间的差异性不显著。在株内径向上,长白落叶松单根管胞力学性质均随着年轮的增加而增加;在株内纵向上,单根管胞拉伸的弹性模量和拉伸强度变异性极显著(0.01水平),而断裂伸长率在纵向上的变异性不显著。该结论为长白落叶松木材的适材适用和定向培育提供了理论依据。
In order to evaluate the tracheid mechanical strength of Larch (Larix gmelinii) wood pulp as pulp material, the tensile mechanical properties of single organelles of Larch (Larix olgensis) were studied by single fiber drawing. The results showed that the average elastic modulus, tensile strength and elongation at break of single rooted tracheid of Larix olgensis were 9.64 GPa, 714.05 MPa and 6.01%, respectively. The average values of latewood were 12.74 GPa and 963.85 MPa , And 8.60%. Analysis of variance showed that the tensile elastic modulus, tensile strength and elongation at break of single root tragacanth were significantly different (0.01 level), the mechanical properties of single root plumule of latewood were significantly higher than those of earlywood. The variation of elastic modulus and tensile strength of single root canal cell in radial annual rings was very significant (0.01 level), and the difference of elongation at break was not significant between annual rings. In the in-plant radial direction, the mechanical properties of single-rooted cell of Larix olgensis increased with the increase of annual rings. In the longitudinal direction of the plant, the elastic modulus and tensile strength variability of single- Horizontal), while the elongation at break in the longitudinal variability is not significant. This conclusion provides a theoretical basis for the suitable and directional cultivation of P. lanceolata wood.