【摘要】 分析灰楸不同种源间遗传变异，为选择表现优良的灰楸无性系，采用相关分析和标准差选择方法，对5个地点62个灰楸无性系进行遗传变异分析与优良无性系选择。结果显示：树高、胸径及各性状在种源间差异极显著(F=7.56^**和F=6.32^**),种源内差异显著。树高变异系数10.27%～19.54%,胸径变异系数为9.47%～25.39%。灰楸62个无性系变异基础丰富，选择潜力较大。灰楸各性状的重复力在0.429～0.829之间，遗传属于中等强度范围，不同种源间差异较大，各性状受遗传控制较强，环境影响较弱，对其进行早期选择比较可靠。10 a生灰楸的树高、胸径均呈现出极显著的年-年相关性。速生期持续时间长短可作为灰楸优良无性系选择的一个重要指标，与其他指标综合选优。按10%入选率，选择6个灰楸优良无性系（线灰、线灰14号、灰楸07104、暖家灰、灰楸07150、细20-2）。所选优良无性系平均树高和胸径分别比对照提高17.5%、82.9%。树高遗传增益达到9.7%,胸径遗传增益达到18.9%。灰楸无性系应在树龄6 a后进行早期优选和良种审定。更多还原

【Abstract】 Analysis of genetic variation among different provenances of Catalpa fargesi,select the clones of C.fargesi with good performance.Correlation analysis and standard deviation selection were used, genetic variation analysis and selection of superior clones were carried out on 62 different clones of C.fargesi from 5 place.The results show that, tree height, DBH and all traits were significantly different among provenances(F=7.56^**和F=6.32^**),the differences within provenances were significant.Tree height variation coefficient range 10.27%-19.54%,DBH variation coefficient range 9.47%-25.39%.Rich base of variation, great selection potential.Repeatability of characters in C.fargesi range 0.429-0.829,it belongs to the range of moderate intensity heredity, there were significant differences among different provenances, each trait is strongly controlled by heredity, the environmental impact is weak, it is reliable to select their characters.The height and DBH of 10 year old trees were significantly correlated with each other.The duration of fast growing period can be an important index for the selection of good clones of C.fargesi,comprehensive selection with other indicators.The selection rate is 10%,six fine clones of C.fargesi（wire C.fargesi,wire C.fargesi 14,C.fargesi 07104,Warm Home of C.fargesi,C.fargesi 07150,fine 20-2）were selected.The average height and DBH of the selected clones were 17.5% and 82.9% higher than those of the control, respectively.The genetic gain of tree height reached 9.7%,the genetic gain of DBH was 18.9%.C.fargesi clones should be at least 6 years old carry out early selection and approval of superior varieties.更多还原