三倍体毛白杨无性系木材密度遗传变异研究

该文对三倍体毛白杨无性系气干密度的无性系间和株内径向、纵向的变异进行了研究 ,结果表明 :无性系全年轮密度、早材密度和晚材密度平均值分别为 0 .44 4,0 .42 8和 0 .5 11g/cm3.气干密度在无性系间和年轮间存在显著差异 ;株内径向变异随树龄增加呈波动性的上升趋势 ;株内纵向变异趋势在取样范围内不一致 .全年轮密度、早材密度和晚材密度的无性系重复力分别为 0 .89,0 .92和 0 .86 ,说明木材气干密度受到强度遗传控制 .

Genetic variation in wood density of triploid clones of Populus tomentosa

The genetic variation in wood densities of triploid clones of Populus tomentosa Carr. were investigated and the variations in wood densities among clones, radial direction and vertical direction were studied in this paper. The average values of growth ring densities, early wood densities, late wood densities were 0 444,0 428,0 511 g/cm 3 respectitively. There were significant differences among clones and among growth rings in wood densities.The radial direction variation in wood densities were unstably accending, the vertical variation patterns were not identical.Clonal repeatabilities of growth ring densities, early wood densities, late wood densities of air dry timber were 0 89, 0 92 and 0 86 respectitively.This indicated wood densities were under strong genetic controls.