思茅松无性系种子园半同胞子代遗传测定研究

Study on Half-sib Genetic Testing of Clonal Seed Orchard of Pinus kesiya var.langbianensis

[目的]研究思茅松无性系种子园半同胞子代遗传测定。[方法]对4年生子代测定林各生长性状进行方差分析和多重比较。[结果]树高、胸径、材积的家系间差异均达极显著水平,家系内差异不显著。平均树高家系遗传力为0.497,平均单株遗传力为0.128;平均胸径家系遗传力为0.599,平均单株遗传力为0.190。家系间树高、胸径遗传力中等以上,说明其变异主要受遗传控制。家系内遗传力较低,说明家系内变异受遗传控制影响较小。家系间树高、胸径、材积性状差异达显著和极显著水平。不同家系间平均树高变异较大,为4.4~6.6 m;平均胸径总体差异较小,为6.7~11.0 cm;平均单株材积差异较小,为0.0103~0.035 0 m3,不同家系间的胸径生长量较树高生长量和单株材积生长量差异大。树高和胸径的遗传增益分别为10.670%和25.050%。[结论]采用思茅松无性系种子园的良种造林具有较好的增产效果。

[Objective]To study half-sib genetic testing of clonal seed orchard of Pinus kesiya var.langbianensis.[Method]The variance analysis and multiple comparison of growth characters of four-year-old forest were conducted.[Result]The difference in height,chest diameter and volume of trees among families was very significant,but not in families.The average genetic strength of the family with chest diameter was 0.599,and the average genetic strength of single plant was 0.190.The genetic strength of interfamily tree height and chest diameter was above medium,indicating that its variation was mainly controlled by heredity.The low heritability in the family indicated that the variation in the family was less affected by genetic control.The multiple comparison result showed that there was significant difference of the height,and breast diameter,the timber volume.Between different families the average height variation was big,and the range of variation was 4.4-6.6 m;The average chest diameter,the overall growth difference was small,and range of variation was 6.7-11.0 cm;The average single mass-accretion difference was small,range of variation was 0.010 3-0.035 0 m3.The growth of chest diameter between different families was higher than that of trees and the growth of individual trees was greater.The genetic gains of tree height and chest diameter were 10.670%and 25.050%,respectively.[Conclusion]The improved afforestation of the clone seed garden of simao pines has a high yield increase effect.