西藏柏木半同胞家系子代测定及优良家系选择

Selection of Half-sib Progeny Families of Cupressus torulosa

为选择优良的藏柏用材和防护树种种质资源,对来自云南境内的35个藏柏优树家系建立的9 a生子代测定林进行调查分析。结果显示,家系间各性状生长差异均达到显著水平,说明具有丰富的遗传变异和选育潜力。林分树高、胸径、冠幅、冠高比、单株材积的遗传力分别为0.52、0.60、0.79、0.76、0.50。以树高、胸径、材积分别超过群体平均值5%、10%、30%选择优良用材林家系,入选5个家系树高、胸径、材积的平均值分别为6.55 m、12.82 cm、0.063 m3,估测遗传增益分别为5.13%、13.96%、29.68%;以冠高比、冠幅分别高于群体平均15%和20%选择防护林家系,入选5个家系冠高比、冠幅的平均值分别为0.355、2.32 cm,估算遗传增益分别为24.52%、21.95%。建议在家系选择基础上进行优树选择,建立嫁接无性系种子园,为生产提供良种。

In order to seletct excellent resource for wood producing or environmental conservation, the 9- years-old progeny test trial which consisting of 35 half-sib progenies families of Cupressus torulosa was studied. Results showed that the growth difference of each progenies families were significant which means there were abundant genetic variation and breeding potential. The heritability of H, DBH, CD, CD/H, V was0.52, 0.60, 0.79, 0.76, 0.50respectively. A stand family mean of H , DBH, Vwas over than 5% , 10% , 30% respectively to select good families for wood produce, then the mean value of H, DBH, V of the 5 selected families was 6.55m, 12.82cm, O. 063m3 respectively, while the genetic gains will be 5.13% , 13.96% , 29.68% respectively. Using a standard that family mean of CD/H , CD was over than 15% , 20% respectively to select good families for environmental conservation, then the mean value of CD/H , CD of the 5 selected families was 0. 355, 2.32 cm respectively, while the genetic gains will be 24.52% , 21.95% respectively. To produce fine seeds for forestry industry, it sug- gested building grafted seed orchard by plus trees of selected families.