21年生马尾松种子园自由授粉子代林生长性状分析及家系选择

摘要

Open pollination progeny forests of 50 families in 21-year-old Pinus massoniana seed orchard as research object, relevant statistical analysis were conducted based on growth factors such as tree hight and DBH that were measured during its 15th and 21st year. The results showed there were significant differences of tree hight, DBH and timber volume among different half-sib progenies, the family heritability values of these 3 factors in 21st year were 0. 235, 0. 320 and 0. 320 respectively. The individual heritability values were 0. 227, 0. 277 and 0. 310 re-spectively. Based on timber volume, 5 families and 27 individual with superior performance were selected, and individual plant genetic gains of timber volume were 35. 03%. In addition, one superior performance family of the whole period was also selected in this study.%以21年生马尾松种子园自由授粉的50个家系子代林为研究对象,采用15年生和21年生时测定的树高、胸径等关键生长因子进行统计学分析。结果表明,树高、胸径、材积在半同胞家系间均存在显著差异,21年生时3个因子的家系遗传力分别为0.235、0.320和0.320,单株遗传力分别为0.227、0.277、0.310,均属中等遗传力。以材积为主要指标进行选择,共选出5个优良家系,27株优良单株,单株材积遗传增益达到35.03%,同时选出全期生长型优良家系1个。