摘要
测定了建始县长岭岗林场引种栽培的12a生日本落叶松标准木干缩性能指标,并分析了它们在轴向上的变异,结果表明:径向全干干缩率为4.63,弦向全干干缩率为6.82,径向气干干缩率为2.41,弦向气干干缩率为3.92,体积气干干缩率为6.49,以上指标在轴向不同部位差异不显著,但有由基部至梢部逐渐变小的趋势;全干差异干缩为1.47,气干差异干缩为1.62,在轴向变异不明显且相对较稳定;体积全干干缩率随轴向部位变化而差异显著,且主要存在于基部与近梢部之间.
The shrinkages of the 12-year-old Larrix kaempfri(lamb.)carr. normal tree in Chang Lingang forest farm in country Jianshi are measured, and their axial variation patterns are analyzed. It shows that the radial-shrinkage of absoulute-dried wood is 4.63 percent and tangential-shrinkage is 6.82 percent .As air-dried wood, its radial shrinkage is 2.41 percent, tangential-shrinkage is 3.92 percent and volume--shrinkage is 6.49. Those indexes have no obvious difference in axis at 0.05 level variance. It has a tendency to reduce gradually from the bottom to the top of the trunk. At the same time,the ratio of tangential to radial shrinkage of absulute-dried wood is1.47 and air-dried wood is 1.62. They are relatively stable in axis. The volume-shrinkage difference among the positions on the axial line of the trunk is significant . And the main difference is between the lower and the positions near the top.
出处
《湖北民族学院学报（自然科学版）》
CAS
2003年第4期41-43,共3页
Journal of Hubei Minzu University(Natural Science Edition)
基金
湖北省教育厅重点项目(99A024).
关键词
日本落叶松
幼龄材
干缩率
差异干缩
轴向变异
Larrix kaempfri(lamb.)carr
juvenile wood
shrinkage
ratio of tangential to radial shrinkage
axial variation pattern
