不同树龄秃杉与杉木人工林木材物理力学性质的比较

对采自广西南丹县山口林场8年生、14年生和28年生的秃杉Taiwania flousiana和杉木Cunninghamia lanceolata人工林木材进行了主要物理力学性质的测定和比较。结果表明：秃杉和杉木的木材密度及主要力学强度均随树龄增加而增大。秃杉木材的气干密度（含水率为12％）、基本密度、径向干缩系数、弦向干缩系数、体积干缩系数、弦面硬度、抗弯弹性模量、顺纹抗压强度、径面抗剪强度和弦面抗剪强度的平均值与杉木相比分别低2．3％，4．4％，1．6％，2．6％，1．5％，3．6％，3．8％，3．4％，17．5％和14．4％，但其端面硬度、径面硬度、抗弯强度、冲击韧性、径面抗劈力和弦面抗劈力的平均值与杉木相比则分别高6．6％，6．1％，3．4％，2．3％，15．0％和16．3％。差异显著性f检验表明，秃杉与杉木人工林的木材密度、硬度、顺纹抗压强度、抗弯弹性模量、抗弯强度、顺纹抗剪强度和抗劈强度均差异显著或极显著，但干缩系数和冲击韧性均差异不显著。图2表3参12

Wood physical-mechanical properties of Taiwania flousiana compared to Cunninghamia lanceolata for plantation development

Researches in wood physical-mechanical of Taiwania flousiana were few, in order to judge the wood, wood physical-mechanical properties for 8, 14, and 28 years old T. flousiana grown on the Shankou Forest Farm of Nandan, Guangxi Province were studied and compared to Cunninghamia lanceolata. Generally, wood density and mechanical properties of both trees increased as tree age increased. Results of a t test for the two wood types showed highly significant （P 〈0. 01） or significant （P 〈0. 05） differences for wood density （ including air-dried density （P 〈 0. 05） and basic density （P 〈 O. 01） ）, hardness （P 〈 0. 01）, bending strength （P 〈0, 05）, the modulus of elasticity in static bending （P 〈0. 01 ）, compression strength parallel to the grain （P 〈0. 05）, shearing strength parallel to the grain （P 〈0. 01）, and cleavage strength along the grain （P〈0.01）, but no significant differences for shrinkage coefficient or toughness. When compared to C. lanceolata, the following properties of T. flousiana were lower： air-dried density （moisture content of wood is 12% ） （2. 3% ）, basic density （4. 4% ）, radial shrinkage coefficient （ 1.6% ）, tangential shrinkage coefficient （2. 6% ）, volumetric shrinkage coefficient （ 1.5% ）, tangential section hardness （3.6%）, the modulus of elasticity in static bending （3.8%）, compression strength parallel to the grain （3.4%）, radial shearing strength parallel to the grain （17.5%）, and tangential shearing strength parallel to the grain （14. 4% ）, but greater for the following properties： cross section hardness （6. 6% ）, radial section hardness （6. 1% ）, bending strength （3.4%）, toughness （2. 3%）, radial cleavage strength along the grain （15.0%）, and tangential cleavage strength along the grain （ 16. 3% ）. These establishment and rational utilization of T. flousiana.