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以湖北省京山县太子山林场管理局马尾松无性系嫁接种子园半同胞8年生子代林为研究对象,在对胸径、树高、枝下高、冠幅和材积等生长因子进行实地调查的基础上进行遗传力分析.结果表明:不同半同胞家系林木各生长因子之间存在极显著性差异,显示马尾松半同胞家系林木间存在较为丰富的遗传变异,具有较大的选育潜力;8年生马尾松半同胞家系子代林树高、胸径和材积的遗传力分别为0.7436、0.6055和0.6500;采用20%的入选率时,筛选出5个优良半同胞家系且入选半同胞家系的材积、树高和胸径遗传增益分别为51.34%、17.45%和22.19%.
Taking the 8-year-old offspring of semi-siblings of Pinus massoniana clonal seed orchard in Taizishan Forest Farm Authority of Jingshan County in Hubei Province as the research object, the growth factors such as DBH, tree height, crown height, Based on the analysis of heritability, the results showed that there was a significant difference between the growth factors of different semi-sib families in the forest, which indicated that there was abundant genetic variation among the trees in the half-sib. The heritability of tree height, DBH and volume of offspring of annual Pinus massoniana semi-sib families were 0.7436, 0.6055 and 0.6500, respectively. When the selection rate was 20%, 5 elite half-sib families were screened, And DBH gain were 51.34%, 17.45% and 22.19% respectively.