无性系杉木的物理力学性质

Physical and mechanical properties of clone Chinese fir wood.

对浙江省开化林场９年生无性系杉木和实生苗杉木木材的物理力学性质进行了测定比较。结果表明，在测定的１５个无性系中，有的优于实生苗杉木，有的次于实生苗杉木。无性系杉木材的平均气干密度为０３４０ｇ·ｃｍ－３，基本密度０２８０ｇ·ｃｍ－３，径向干缩系数０１３１％，弦向干缩系数０２１７％，体积干缩系数０４０１％，抗弯强度４４３５５ＭＰａ，抗弯弹性模量８２９６ＧＰａ，冲击韧性３２９５０ｋＪ·ｍ－２。

Physical and mechanical properties of clone Chinese fir wood and seedling are studied and compared.Tested wood for both is of nine year old,from Kaihua Forest Farm of Zhejiang Province.Results of 15 clones show that some physical and mechanical parameters of clone Chinese fir wood are superior to seedling,and the other inferior to.Air dry density of clone Chinese fir wood is 0 340 g·cm -3 ,basic density 0 280 g·cm -3 ,coefficient of radial shrinkage 0 131%,coefficient of chordwise shrinkage 0 217%,coefficient of volumetric shrinkage 0 401%,bend strength 44 355 MPa,bend elastic modulus 8 296 GPa,and impact ductility kJ·m -2 .