马尾松木材比重和管胞长度在个体间差异很大,所占分量分别为其群体总变异的40％和20％,因此,通过个体选择可望获得较大的增益。相邻两群体的材性差异不显著,林分选择效果尚待深入研究。不同生长速率的样木间该二性状差异很小。 Masson pine biomass and tracheid length vary widely among individuals, accounting for 40% and 20% of their total population variation, respectively. Therefore, larger gains are expected through individual selection. There is no significant difference in material properties between two adjacent groups, and the effect of forest selection has yet to be further studied. Different growth rates of the wood between the two traits is very small.