23年生杉木第2代种子园自由授粉子代测定林分析及选择

Analysis and selection for 23 years old open-pollinated progeny test of the 2nd generation seed orchard in Cunninghamia lanceolata

为了对杉木第2代种子园亲本进行选择,调查分析了23年生杉木第2代种子园自由授粉子代测定林的生长和木材基本材性。结果表明:测定林的生长性状受到弱度的遗传控制,树高家系遗传力为0.043,单株遗传力为0.014 2,胸径家系遗传力为0.157,单株遗传力为0.061 8,单株立木材积家系遗传力为0.121,单株遗传力为0.044 5。木材基本密度、红心率、偏心率、树皮率在家系间差异不显著。最终,筛选出12个速生优良家系,平均单株立木材积遗传增益14.90%,筛选出速生优良单株9株,平均单株立木材积遗传增益16.49%。选出的优良家系及单株可充实杉木育种材料。

Experiments were conducted to study the genetics for growth and basic wood traits of the 2nd generation seed orchard progeny test stand which was 23 years old. The results showed growth was controlled by genetic factors, slightly. Family and individual heritability of tree height was 0.043 and 0.014 2 respectively. That of DHB was 0.157 and 0.061 8 respectively. That of volume was 0.121 and 0.044 5 respectively. There were not significant differences on wood density, red wood rate, skewed core rate, tree bark rate, among families. 12 superior families and 9 superior individuals were selected based on volume. Average volume genetic gain of superior families and individuals was 14.90% and 16.49%, rdspectivdy. Selected families and individuals were good breeding materials.