杉木人工林幼龄材与成熟材木材干缩性能指标的比较

测定了建始长岭岗林场 32年生杉木人工林的干缩性能指标 ,并分析了各指标在立地与木材径向部位上的差异 ,结果表明 :来自两样地的木材干缩性能指标均无明显差异 ;木材在径向部位上按 16年为界划分的成熟材与幼龄材相比较 ,全干状态和气干状态下的径向干缩率均具有极显著差异 (α =0 0 1) ,全干和气干体积干缩率、全干和气干差异干缩、全干弦向干缩率等指标的差异达显著水平 (α =0 0 5 ) ,气干弦向干缩率在径向部位上差异不显著。

Shrinkages Comparative on Juvenile and Mature Wood of Chinese Fir

In the article, the shrinkages of the 32-year-old Cunninghamia Lanceolata Plantation in Chang linggang forest farm are measured, and their variation with different sites and different radial pattern are analyzed. It shows that the sites does not lead to change of shrinkages. The mature wood and juvenile wood divided into with 16-year-annual ring, have no obvious difference with tangential-shrinkage percent at 0.05 level variance.But the other indexes have marked difference between juvenile and mature wood.