康定杨优树无性系苗期测定

Nursery term testing of clones of Populus kangdingensis

经3a育苗试验,从41个康定杨Populuskangdingensis优树无性系中选出8个无性系,按照随机区组排列,进行苗期测定。结果表明:①无性系的苗高、地径和材积的生长达到极显著水平,苗高、地径和材积的广义遗传力分别为0 8978,0 8314和0 8081,遗传变异系数分别为15 82%,14 02%和41 12%。说明从中选择优良无性系是可能的。②苗高、地径和材积3个性状之间的遗传、表型与环境相关系数都是极显著的。表明3个性状均可作为优良无性系的选择性状,但从相关遗传力和相关遗传变异贡献率分析表明,利用苗高进行选择优于地径和材积。③从8个无性系中进一步选出7,11,27,28等4个无性系,在苗高、地径和材积生长上的遗传增益分别为36 69%,35 51%和139 93%。

In the threeyear nursery testing,8 of 41 clones are selected and ranked randomly.Their nursery terms are tested.The results are as follows:①The broadsense heritabilities of height,diameter and volume of cloned seedings are 0897 8,0831 4 and 0808 1 respectively;genetic variation coefficients are 1582%,1402% and 4112%.It is possible to select excellent clones.②The correlation coefficients among heredity,appearance and environment of height,diameter and volume are high.These three properties can be excellent selected properties.The analysis of correlated heritability and correlated genetic variation contribution rate shows that the selection of height is superior to those of diameter and volume.③4 clones including No7,No11,No27 and No28 are selected from 8 clones.The genotypic gains of height,diameter and volume are 3699%,3551% and 13993% respecitvely.