火炬松木材的抗弯弹性模量和抗弯强度的变异

Variations of MOE and MOR in loblolly pine wood.

10年生速生材火炬松的 2 8个家系间 ,木材的抗弯弹性模量 (MOE)和抗弯强度 (MOR)分别在 0 .0 0 1显著性水平和 0 .0 1显著性水平下差异显著 .整体上 ,2 8个家系的MOE ,MOR的个体变异大部分大于家系间的变异 ,因此火炬松材质改良在家系基础上进行个体改良效果会更好 .其中 17,37,5 1等 3个家系为抗弯性能较好的优树家系 .2 8个家系的MOE和MOR存在线性相关 ,相关系数为r=0 .5 74.MOE和MOR分别与气干密度达到 0 .0 5和 0 .0

Among the 10 years old wood of loblolly pine from 28 clones, MOE (modulus of elasticity) and MOR (modulus of rapture) had notably differences respectively at 0.001 and 0.01 levels. The individual variations of MOE and MOR in a clone were mostly higher than those among the clones, which showed that the effect of genetic improvement of plantation loblolly wood properties could be better on the individuals in a clone. Among the 28 clones,number 17, 37 and 51 were better in respect to MOR. MOE and MOR of the 28 clones had linear relations, r=0.547. MOE and MOR with air drying density had remarkable relation respectively at 0.05 and 0.01 level.