中文 
English 本文排版定稿已在中国知网网络首发，如需阅读全文请打开知网首页，并搜索该论文题目即可查看。
8年生亚美马褂木无性系生长和材性变异与选择
Growth and Wood Traits Variation and Selection of Superior Clones of eight-year-old Liriodendron sino-americanum
-
摘要: 以亚美马褂木120个8年生无性系为研究材料，估算各性状遗传参数，探究亚美马褂木无性系生长和材性遗传变异规律，筛选生长和木材基本密度兼优的无性系。结果表明：生长和木材基本密度在无性系间存在显著或极显著差异。遗传变异系数和无性系重复力大小在性状间变化趋势一致，以单株立木材积最大，胸径、冠幅、树高居中，木材基本密度最小。无性系各性状具有较强的遗传稳定性，其无性系重复力显著大于个体重复力。树高、胸径、冠幅、单株立木材积间的表型相关和遗传相关均呈现出极显著相关性，但木材生长和木材基本密度间相关性不显著，表明两者在遗传上可能具有独立性；基于选择指数筛选出15个生长和木材基本密度兼优的无性系，入选率为12.40％，选择强度为1.73。与参试群体均值相比，入选优良无性系的树高、胸径、冠幅、单株立木材积和木材基本密度平均现实增益分别为22.25％、29.45％、28.64％、74.14％和11.04％，平均期望遗传增益分别为13.39％、18.94％、18.53％、52.56％和6.09％。可见，参试无性系表现出显著的变异和选择潜力，每个性状主要受遗传因素控制，表明遗传控制具有很强的稳定性和独立性。Abstract:Objective Liriodendron sino-americanum P.C.Yieh ex Shang et Z.R.Wang is a new-generation preferable tree species in ecological reforestation, ornamental plantation, and timber production. In order to explore the genetic variation of growth and timber wood density, as well as to select excellent clones with best growth performance and wood properties for breeding material.Method Overall 120 eight-year-old L. sino-americanum clones, which were planted in Zhangping Wuyi State-owned Forest Farm, were used to analyze the level of genetic variation of tree height (H), diameter at breast height (D), crown width (CW), individual tree volume (V) and wood basic density (WD).The ANOVA method was used to detect the variation among clones on growth and wood traits. Phenotypic and genotypic correlation between traits were analyzed. Comprehensive selection index (I) was performed to select superior clones.Result the variations among clones on growth and wood traits were significant (p<0.05) or extremely significant (p<0.01). Similar trend of changes (V>D>CW>H>WD) were found in genetic variation coefficient (V=25.62%, D=10.53%, CW=10.31%, H=8.94%, and WD=5.83%) and clonal repeatability (V=0.709, D=0.643, CW=0.640, H=0.602 and WD=0.552). No significant correlations were detected between growth and wood traits. Fifteen clones were identified as superior clones, with an average selection rate of 12.40% and an average selection intensity of 1.73. These clones demonstrated significant average realized gains in H at 22.25%, D at 29.45%, CW at 28.64%, V at 74.14%, and WD at 11.04%, compared to the mean values of all clonesConclusion The tested clones exhibit significant variation and strong selection potential. Each trait evaluated is predominantly governed by genetic factors and demonstrates good genetic stability. The growth traits and basic wood density show relative independence in their genetic correlations. The fifteen selected excellent clones possess high genetic gain and can be utilized as materials for future breeding and propagation.
下载: