欧洲白桦早期生长性状变异分析

The Analysis on Growth Variations of Young Betula pendula Seedlings

欧洲白桦（2a生）13个家系间的苗高性状变异较小，变异范围在22．78％～37．14％之间；家系间地径生长变异较大，而家系内地径生长变异较小，变异范围为20．15％－50．32％。方差分析结果表明：家系间2a生苗高与地径生长均达差异显著水平。通过2a连续测定，综合考虑苗高及地径2个性状，初步认为6号、9号、1号、10号及13号等5个家系生长表现良好，且家系内苗木高生长及地径生长变异较小，生长稳定。

The growth of two-year-old seedlings from thirteen families of Betula pendula was studied in this paper. The resuits showed that the height variations of seedlings were slightly among the 13 families, and the coefficient of variation （CV） was from 22. 78% to 37. 14%. However, the ground diameter variations were greatly among the 13 families, and CV was from 20. 15% - 50. 32%. By the analysis of variance, there were significant differences in the height and ground diameter of seedlings among 13 families. Synthetically in the height and ground diameter of seedlings as well as their CV within the family resoectively, the family No. 6, No. 9, No. 1, No. 10 and No. 13 were better than the other families.