细叶桉种源-家系综合选择的研究

对细叶桉14个种源的100个家系生长性状,形质性状进行源间和家系间的差异分析和遗传分析,结果表明性状间差异极显,家系遗传力大于单株遗传力,除分枝性状外,生长性状与形质性状相关极显。7年生生长最好的13659种源的平均树高,胸径和单株材积分别是最差种源13308的1．27,1．32和2．14倍,7年生最优家系是No.17号家系,其单株材积达0.06134 m^3,是最差家系No.33号的3．6倍,虽家系群体均值的1．74倍。运用指数选择法对家系进行多性状综合选择,初步选出22个优良家系,其树高,胸径,材积,枝下高,干形和分枝的遗传增益分别达到7．31％,6．39％,18．01％,13．77％,8．22％和5．36％。

Study on Integrated Selection of Provenances-families of Eucalytus tereticornis

The analyzsis results of Eucalyptus tereticornis provenance/famlies trial involving 100 families within 14 provenances showed that there were highly significant differences among growth and other characters at family and provenance level. Correlation between growth and form quality characters were significant excepting B_r. Heritability of families was stronger than individual heritability. At the age of 7, H, D_BH and S_V of the best provenance 13659 was 1.27, 1.32 and 2.14 times of the worst provenance 13308 respectively. Mean individual volume of the best family No.17 with 0.061 34 m³ was 3.612 5 times of the worst family No. 33 and 1.744 6 times of the average of total families by comparison. Using index selection of multiple characters, 22 superior families were selected from 100 families population tested, and the genetic gain of height, D_BH, S_V, C_BH, S_F and Br of those superior families will be reached as high as 7.31%, 6.39%, 18.01%, 13.77%, 8.22% and 5.36% respectively.