东北林业大学学报2026，Vol.54Issue(4)：9-15,39,8.
依据生长和材性指标的滇楸优良无性系选择
Selection of Elite Clones of Catalpa fargesii f.duclouxii Based on Growth and Wood Property Indicators
摘要
Abstract
To explore the variation characteristics and genetic regularity of growth and wood property traits among 22 Catalpa fargesii f.duclouxii clones,screen high-quality clones,and provide basic materials for the popularization of improved C.fargesii f.duclouxii varieties,a study was conducted.Twenty-two 14-year-old clones preliminarily selected in early-stage research were used as test materials.Twelve traits were measured,including growth traits(tree height,diameter at breast height,crown width)and wood property traits(moisture content,ethanol-benzene extractive content,lignin content,α-cellulose content,holocellulose content,air-dried density,absolute dry density).Additionally,stem volume and hemicel-lulose content were calculated.Genetic parameter estimation,analysis of variance(ANOVA),correlation analysis,and principal component analysis(PCA)were adopted to conduct comparative analysis,comprehensive evaluation,and selec-tion of the 12 traits across the clones.The results showed that except for air-dried density,oven-dried density,and diame-ter at breast height,extremely significant differences were detected in the other traits among the 22 clones.The coefficient of variation(CV)of all traits ranged from 3.35%to 40.32%.Among these traits,stem volume exhibited the highest CV,while holocellulose content had the lowest.The repeatability of the 22 clones varied from 0.126 to 0.999.Specifically,the repeatability of chemical composition traits was as high as above 0.950,and that of tree height and crown width exceeded 0.720.Weak correlations were observed between growth traits and wood property traits.Within growth traits(tree height,diameter at breast height,stem volume,crown width),all pairwise traits showed extremely significant positive correlations except for the non-significant correlation between tree height and crown width,with the strongest correlation found between diameter at breast height and stem volume.Among wood property traits,extremely significant positive correlations were identified between density-related traits and among some chemical composition traits.Principal component analysis indica-ted that the first four principal components accounted for 79.000%of the total variance,retaining most information of the 12 traits.Using the contribution rate of each principal component as the weight coefficient,clones were ranked by their comprehensive scores(F values).With a 20%selection rate,5 elite clones were screened out,namely DQ010-8,DQ020-3,DQ049-1,DQ134-1,and DQ148-1.The average values of tree height,diameter at breast height,stem volume,and crown width of the selected elite clones were 12.97 m,20.86 cm,7.79 m3,and 5.50 m,with corresponding genetic gains of 78.84%,54.61%,82.68%,and 79.80%,respectively.The average values of ethanol-benzene extractive content,lig-nin content,holocellulose content,hemicellulose content,air-dried density,and oven-dried density were 9.02%,31.80%,63.89%,19.33%,0.49 g·cm-3,and 0.44 g·cm-3,with genetic gains of 0.62%,1.80%,0.23%,1.42%,0.26%,and 0.48%,respectively.关键词
滇楸/无性系/生长性状/材性性状/主成分分析Key words
Catalpa fargesii f.duclouxii/Clone/Growth trait/Wood property trait/Principal component analysis分类
农业科技引用本文复制引用
曾钦朦,刘昌勇,金传娥,夏井凡,李慧,张明刚..依据生长和材性指标的滇楸优良无性系选择[J].东北林业大学学报,2026,54(4):9-15,39,8.基金项目
贵州省林木种苗培育补助项目(2025-ZM-15). （2025-ZM-15）
