陈山红心杉优树自由授粉子代苗木生长特性研究

A Study of Seedling Growth Traits of Open Pollinated Families of Cunninghamia lanceolata“Chen-shan Red Heartwood”

在四川省洪雅林场对陈山红心杉二代种子园的32个自由授粉优树子代进行苗期生长测定,结果表明:不同家系陈山红心杉的平均苗高为14.08 cm,平均变异系数为17.58%;平均地径为3.10 mm,平均变异系数为16.65%,家系间苗高和地径的差异均达到显著水平。苗高、地径的遗传力分别为0.866和0.889,表明其受到较强的遗传控制。通过综合评价,选出了3个优良家系,其平均苗高为16.31 cm,平均遗传增益为13.72%;平均地径为3.49 mm,平均遗传增益为11.18%,经选择的优良家系可进一步测定和评价。

Based on the 32 open-pollinated families in the second-generation seed orchard of Cunning- hamia lanceolata ＂Chen-shan Red Heartwood＂, investigations were made on the growth traits of half-sib progeny in Hongya Forest Farm of Sichuan Province. The results indicated that the average seedling height and variation coefficient were 14. 08 cm and 17.58%, respectively. The average ground diameter and variation coefficient were 3.10 mm and 16.65%, respectively. And there existed significant differ- ences in seedling height and ground diameter among different families. The family heritability of seedling height and ground diameter was 0. 866 and 0. 889, indicating the great family heritability control for growth traits. 3 excellent families were selected on the basis of comprehensive assessment. The average tree height was 16.31 cm,the genetic gain was 13.72 %, and the average ground diameter was 3.49 mm,and the average genetic gain was 11.18%. The selected excellent families could be reserved for fur- ther test and assessment.