24年生马尾松种子园自由授粉子代测定及家系选择

Open Pollination Progeny Test and Superior Family Selection in 24-year-old Pinus massoniana Seed Orchard

以24年生马尾松(Pinus massoniana)种子园自由授粉的81个子代家系为研究对象,通过测定树高、胸径等生长因子,在统计学分析的基础上,进行遗传力、表现稳定性分析和优良家系选择。结果表明,家系间胸径存在显著差异,树高、材积间均存在极显著差异,24年生马尾松半同胞家系树高、胸径、材积的遗传力分别为0.079、0.027、0.048,均属低等遗传力。以材积为指标,采用综合法选择优良家系,共选出7个优良家系,30株优良单株,单株材积遗传增益达到18.26%。

Choosing 81 families from 24-year-old Pinus massoniana seed orchard as objects, by testing growth factors as tree height and DBH, based on statistical analysis, heritability and performance stahili- ty were analyzed, and superior families were selected. Results indicated that differences in DBH among families were significant, which in tree height and timber volume were extremely significant. Heritability values of tree height, DBH and timber volume from 24-year-old half-sib families of Pinus massoniana were 0. 079, 0. 027 and 0. 048 respectively, belonging to low heritability. Using timber volume as index, 7 superior families and 30 superior individuals were selected by comprehensive method, and genetic gains of individual timber volume reached 18.26%.