摘要
【目的】研究杉木无性系生长性状和木材品质性状的遗传变异规律,为广西杉木栽培区选择优良无性系、提高广西杉木人工林经营效益提供参考。【方法】对34个杉木无性系的单株材积、木材基本密度和管胞形态性状进行方差分析,估算无性系重复力、遗传相关和遗传增益等遗传参数,采用多性状综合指数选择方法选出生长性状与木材品质兼优的杉木无性系并估算遗传增益。【结果】杉木的生长性状具有丰富的遗传变异,变异系数较大的是材积、胸径和树高,其变异系数分别为41.06%、16.44%和12.41%。杉木无性系间的胸径、树高、材积、木材基本密度、管胞长度和管胞宽度差异极显著(P<0.01),管胞长宽比差异显著(P<0.05),且无性系重复力除管胞长宽比外均在0.5以上。木材密度与胸径、树高、材积、管胞长度、管胞宽度在表型相关和遗传相关上呈负相关。采用多性状综合选择指数法选出3个优良无性系,其胸径、树高、材积、木材基本密度、管胞长度、管胞宽度、管胞长宽比的遗传增益分别为9.83%、7.58%、24.60%、-3.92%、4.65%、2.12%和1.26%。【结论】杉木无性系间具有良好的选择潜力,采用多性状综合指数选择法可以选出生长性状与木材品质兼优的杉木无性系。
[ Objective ] Genetic variation of Chinese fir clones on growth traits and wood properties was studied to provide references for selecting superior clones in cultivation areas and boosting plantation benefits in Guangxi. [Method] First, the differences of individual tree volume （V）, wood basic density （WBD） and tracheid shape （TS） between clones were analyzed. Then the clonal repeatability and genetic correlation were calculated. Lastly, Chinese fir clones with good growth traits and wood quality were selected based on comprehensive index of multiple traits se- lection, and the genetic gains of the selected clones were estimated. [ Result ]There were extensive genetic variations between clones on growth traits and wood properties. The coefficient of variation on V, diameter at breast height （DBH）, and tree height （H） was 41.06%, 16.44%, and 12.41%. Extremely significant difference （P〈0.01） was demonstrated between clones on DBH, H, V, WBD, tracheid length （TL）, and tracheid width （TW）. The ratio of length to width of traeheid （RLWT） also differed significantly between clones （P〈0.05）. The elonal repeatability of all given traits was larger than 0.5, with the exception of TL. The WBD was negatively correlated with DBH, H, V, TL, and TW on phenotype and genotype. Three fine clones were picked out and the expected genetic gain of DBH, H, V, WBD, TL, TW, and RLWT was 9.83%, 7.58%, 24.60%, -3.92%, 4.65%, 2.12%, and 1.26%, respective- ly. [Conclusion]There is extensive selection potential at clonal level. Using comprehensive index of multiple traits se- lection is able to select the superior clones with fast-growing speed and high wood quality.
出处
《南方农业学报》
CAS
CSCD
北大核心
2014年第9期1626-1631,共6页
Journal of Southern Agriculture
基金
广西林业科技项目(林科字[1996]第4号)
关键词
杉木
无性系
木材品质
遗传变异
Chinese fir
clone
wood quality
genetic variation
