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对19年生火炬松家系的生长性状和遗传参数进行研究分析,结果显示:胸径、树高和材积等3个主要性状在火炬松家系间的差异达极显著水平,家系的树高、胸径和单株材积均具有较高遗传力、受中等或中等以上遗传控制,说明各性状的差异主要由遗传因素所致,有较大的改良潜力。从参试的25个家系中选出5个优良家系,其平均胸径、树高、单株材积分别为22.08 cm、14.25 m、0.2660 m~3,分别比群体平均值高8.72%、11.85%、29.66%,遗传增益分别为5.77%、10.57%、22.18%。
The growth traits and genetic parameters of 19-year-old Pinus taeda families were studied and analyzed. The results showed that there were significant differences among the three major traits of Pinus taeda families including DBH, tree height and timber volume. The tree height, DBH and single Plant height were higher heritability, controlled by medium or above genetic, indicating that the traits of the major differences caused by genetic factors, have greater potential for improvement. Five elite families were selected from 25 families tested. The average DBH, tree height and single plant volume were 22.08 cm, 14.25 and 0.2660 m 3, respectively, which were 8.72% and 11.85% 29.66% and genetic gain were 5.77%, 10.57% and 22.18% respectively.