马尾松半同胞家系子代林遗传增益分析

以湖北省京山县太子山林场管理局马尾松实生种子园子代半同胞家系16年生林分为研究对象,测定了胸径、树高、枝下高、冠幅和材积等生长因子,结果表明:不同半同胞家系林木各生长因子间差异均达极显著水平,说明马尾松林木半同胞家系间存在较为丰富的遗传变异,具选育潜力。16年生半同胞家系马尾松林分树高、胸径及材积遗传力分别为0.843 5,0.740 5及0.750 6。根据性状遗传力的大小,以树高、胸径和材积作为优良马尾松半同胞家系选择指标。采用10%入选率进行选优时,可选出9个优良半同胞家系,其树高、胸径和材积遗传增益分别可达13.37%、25.57%和51.53%。

Genetic Gain of Analysis on Half-Sib Progenies Family of Pinus massoniana

Using 16-years-old half-sib progenies of Pinus massoniana stand from seed orchard of Jingshan County,Hubei Province as materials,growth factors such as diameter at breast height (DBH),tree height,height under branch,crown diameter and timber volume were measured.Results showed that there were significant differences of growth factors measured among different half-sib progenies,indicating that there were abundant genetic variation among half-sib progenies family and potentials for selection.The heritability of height,DBH and timber volume of 16-years-old Pinus massoniana stand were 0.843 5,0.740 5 and 0.750 6,respectively.According to the heritability value,height,timber volume and DBH could be used as selection indexes.Using 10% as selection ratio,9 superior half-sib progenies families could be selected with genetic gains of height,DBH and timber volume were 13.37%,25.57% and 51.53%,respectively.