福建柏优树子代生长性状遗传变异及选择

Growth Genetic Variation and Selection of Plus Tree Progeny in Fokienia hodginsii

  • 摘要: 在福建省永安国有林场福建柏优树子代试验林8、11、16、20 a林龄时分别进行每木调查,分析福建柏优树生长性状遗传变异规律并筛选优树家系和优良单株。结果表明:随着林龄增加,树高、胸径及材积的遗传变异系数和遗传力均随着林龄的增长呈现出下降的趋势。林龄20 a时,试验林平均树高、胸径、单株立木材积分别为10.65 m、16.75 cm、0.12236 m3,变异系数分别为2.07%、3.60%、8.79%,广义遗传力分别为0.3109、0.3990、0.4729,狭义遗传力值分别为0.1313、0.1641、0.2245;以单株立木材积育种值为指标,筛选出8个优良家系和59株优良单株。入选优良家系平均单株立木材积达0.19952 m3,平均育种值和遗传增益分别为0.01745 m3和12.20%;入选单株平均单株立木材积达0.27709 m3,平均增益达20.89%。

     

    Abstract: At the age of 8,11,16,and 20 years in the plus tree progeny test stand of Fokienia hodginsii on Yong'an State-owned Forest Farm in Fujian Province,each tree was surveyed to analyze the genetic variation rules of growth of F. hodginsii plus trees and select superior families and individuals. The results showed that the genetic variation coefficient and heritability of tree height,DBH and volume showed a decreasing trend with the increase of stand age. At the age of 20 years,the average tree height,DBH,and volume of the tested forest could reach at 10. 65 m,16. 75 cm and 0. 12236 m3,respectively. The coefficient of variation and heritability values of tree height,DBH and volume all show a downward trend with the growth of forest age. At the age of 20 years,the coefficients of variation for tree height,DBH and volume were 2. 07%,3. 60% and 8. 79%,respectively. The broad sense heritability values were 0. 3109,0. 3990 and 0. 4729,while the narrow sense heritability values were 0. 1313,0. 1641 and 0. 2245,respectively. By calculating genetic gain and breeding values,8 excellent families and 59 excellent individuals were selected based on the performance of standard of individual standing timber volume. the average timber volume of the selected excellent families reached 0. 19952 m3,the average breeding value and genetic gain are 0. 01745 m3 and 12. 20%,respectively;the average timber volume of selected individual plant reached 0. 27709 m3,and average gain reached 20. 89%.

     

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