日本落叶松半同胞家系生长变异研究

Study on Growth Variation of Larix kaempferi Half-sib Families

摘要:

以建始县长岭岗林场17 a生日本落叶松种子园半同胞家系试验林为研究对象，研究不同家系间生长性状的遗传变异和相关性，选择出优良家系并对早期选择的结果进行验证，为日本落叶松遗传改良提供材料。结果表明： 各家系之间胸径、树高和材积的生长差异均达到极显著水平；6 a生与17 a生胸径、树高、材积之间的相关系数在0.541～0.947之间，呈极显著正相关；日本落叶松家系6a生早期选择结果与17 a生选择结果基本一致；以17 a生材积为选择指标，选出排名前10位的优良家系，胸径、树高和材积的遗传增益分别达到3.03%、1.77%和7.11%。

Abstract:

17-year-old half-sib families of Larix kaempferi seed orchard were researched in Changlinggang Forest Farm of Jianshi County. To study the genetic variation and correlation of growth traits among different families, select excellent families and verify the results of early selection, so as to provide materials for genetic improvement of Larix kaempferi. The results showed that there were significant differences in DBH, height and volume among families. Correlation analysis results indicated that there were significant positive correlation amang growth traits between 6-year-old and 17-year-old and correlation coefficients ranged from 0.541 to 0.947. The early selection results of 6-year-old families were basically consistent with those of 17-year-old families; Taking volume as the selection index, the genetic gains of DBH, height and volume of the top 10 families of 17-year-old students reached 3.03%, 1.77% and 7.11% respectively.