楸树杂种无性系早期选择研究∗�

摘要

The Growth traits of 5GyearGold of hybrid clones of Catalpa bungei were measured and analyzed.The results showed that the growth traits including DBH(diameter at breast height),tree height,ground diameter among clones were significantly or extremely significantly different among hybrid clones;The maximum value of DBH was 5 .0 9 cm,and the maximum value of tree height was 4.13 m,and the maximum value of ground diameter was 6.55 cm and the DBH,tree height and ground diameter growth traits were moderately controlled by heredity.Three superior clones were preliminary selected by comprehensive comparison;and the highest values of the genetic gain of the DBH,tree height were 18.55%and 13.45% respectively;and the selection rate was 13�00%.%对5a生楸树杂种无性系的生长性状进行统计分析,结果表明：无性系间胸径、树高、地径生长性状的差异均达到显著或极显著水平,其胸径最大值为5�09 cm,树高最大值为4�13 m,地径最大值为6�55 cm.胸径、树高、地径生长性状受到中度以上程度的遗传控制.通过综合比较,初步选出3个优良无性系,胸径、树高遗传增益最高值为18�55％,13�45％,入选率13�00％.