14年生火炬松优良家系选择

在福建省漳平五一国有林场,对美国引进的火炬松第1代种子园25个家系试验林进行测定,以湿地松、马尾松为对照。结果表明:火炬松早期生长较易感染松针褐斑病,保存率较低;14年生火炬松家系总体生长优于湿地松、低于马尾松;各家系在树高、胸径和材积等性状上有着显著差异;综合各性状共选择出4个优良家系(21、9、18、13号),14年生树高、胸径和单株材积的平均值分别为12.6 m、20.4 cm、0.1981 m3,比湿地松增长9.2%、25.9%、71.1%,遗传增益达8.9%、24.7%、67.9%。

The Selection on Superior Families of 14-year-old Loblolly Pine

The 25 families of loblolly pine introduced from the first-generation seed orchard of the Unites State were tested,the control were masson pine and slash pine.The results of test showed that: the loblolly pine was likely to be infected during early growth period by brown spot of pine needle,and had lower preservation rate,but the growth of 14-year-old loblolly pine was superior to slash pine,and was inferior to masson pine;Each family had evident characteristic differences in tree height,DBH and volume;4 superior families were selected according to the characteristics,14-year-old loblolly pine had average tree height 12.6m,average DBH 20.4cm and average individual volume 0.1981m3,9.2%,25.9% and 71.1% higher compared with slash pine,and their genetic gains were 8.9%,24.7% and 67.9%,respectively.