杉木种子园子代优良无性系测定及选择

The selection of excellent progeny clones in the seed orchard of Cunninghamia lanceolata

对55个杉木无性繁殖品系的测定结果表明：无性系间在树高、胸径和材积性状上存在着显著差异。遗传力变化范围树高为0．389～0．771，胸径为0．169～0．703，材积为0．377～0．674。3个生长性状中，材积的变异系数最大，树高的变异系数最小。对树高、胸径和材积按10％的入选率进行单性状选择，树高遗传增益平均为4．27％，胸径平均为6．36％，材积平均为15．56％。与对照平均值比较，树高的遗传增益平均为8．09％，胸径的遗传增益平均为13．11％，材积的遗传增益平均为23．17％。经过选择能取得较高遗传增益的杉木优良无性系。

The result of determination on 55 clones of Cunninghamia lanceolata shows there are significant differences among different clones in tree height, DBH and volume. The range of heritability is 0. 389- 0. 771 in height, 0.169- 0.703 in DBH, and 0. 377 - 0. 674 in volume. In the three growth traits, the volume differentiation is the biggest, and the height differentiation is the lowest. The tree height, DBH and volume are selected respectively according to the selected percentage of 10%. The average genetic gain of tree height is 4.27%, the average genetic gain of DBH 6.36%, and the average genetic gain of volume 6.36%. Compared with the average control values, the average genetic gain of tree height is 8.09 %, the average genetic gain of DBH 13.11%, and the average genetic gain of volume 23.17%. This selection method can get the excellent clones of C. lanceolata with high genetic gain.