中大径材尾细桉杂种无性系选择研究  

Clonal selection of middle/large diameter timber of Eucalyptus urophylla×E.tereticornis hybrid clones

作　　者：朱显亮 兰俊 王建忠 翁启杰[1] 周长品[1] 甘四明[1] 李发根[1] ZHU Xianliang;LAN Jun;WANG Jianzhong;WENG Qijie;ZHOU Changpin;GAN Siming;LI Fagen(Key Laboratory of National Forestry and Grassland Administration on Tropical Forestry Research,Research Institute of Tropical Forestry,Chinese Academy of Forestry,Guangzhou 510520,China;College of Forestry,Nanjing Forestry University,Nanjing 210037,China;Guangxi Dongmen State Forest Farm,Fusui 532108,China)

机构地区：[1]中国林业科学研究院热带林业研究所,热带林业研究国家林业和草原局重点实验室,广东广州510520 [2]南京林业大学林学院,江苏南京210037 [3]广西国有东门林场,广西扶绥532108

出　　处：《南京林业大学学报（自然科学版）》2020年第2期43-50,共8页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：中国林科院基本科研业务费专项(CAFYBB2019SZ002);广西创新驱动发展专项(桂科AA17204087-3)。

摘　　要：【目的】研究桉树无性系的遗传变异,选育适用于中大径材培育的桉树优良无性系,作为后续良种选育的基础。【方法】以12年生尾细桉(Eucalyptus urophylla×E.tereticornis)杂种无性系试验林的154个无性系为研究材料,结合12年间调查的生长性状和8年生时测定的材性性状,进行方差分析、相关性分析及遗传参数估算等,最后采用主成分分析法进行多性状综合选择。【结果】不同无性系间的生长和材性性状差异均达显著水平,即通过选择可提升培育尾细桉成优质大径材的潜力。中大径材尾细桉无性系开展早期选择的时间在4.5~6.5 a最适,生长性状对基本密度的间接选择效果均为正向,以树高最佳。各性状的无性系重复力为56.28%~85.34%,单株重复力为24.35%~59.27%,无性系重复力均大于单株重复力,各性状受较高的遗传调控,遗传稳定性高。定选的10个优良无性系的生长性状遗传增益为14.64%~73.89%。【结论】所选12年生尾细桉杂种无性系满足桉树中径材培育要求,具有培育成大径材的潜力。【Objective】Eucalyptus species are widely planted in south China because of their large trunk diameter,superior growth and desirable wood properties.Because of their shorter cultivation period and high economic benefits,cultivating Eucalyptus trees with large trunk diameters can effectively increase the supply of medium/large diameter timber,which is in high demandin China.However,the research on Eucalyptus cultivation in China has started recently,and most of this research focused on the forest management and silvicultural technology of Eucalyptus.The number of studies on high-quality breeding and selection is currently low,and only a few Eucalyptus species used for plantations have been investigated.In this study,we investigated the genetic variation of Eucalyptus clones with the goal of selecting superior clones with medium/large diameter timber and providing the basis for further breeding selection.【Method】In this research,the growth traits of 154 twelve-year-old hybrid clones of E.urophylla×E.tereticornis were investigated,in an experimental plantation in Gonghe Town,Heshan City,Guangdong Province.Wood properties,such as basic density,cellulose content,hemicellulose content,lignin content,lignin syringyl-to-guaiacyl ratio,and fiber length-to-width ratio of eight-year-old plants were also analyzed.Genetic analyses of growth traits and wood properties included the analysis of variance and correlation and the analysis of genetic parameters.Principal component analysis was performed in order to classify the investigated hybrid clones,and comprehensive multiple trait selection was applied for the medium/large diameter timber.【Result】①The differences among the growth traits and wood properties of different clones were significant,increasing the potential for screening high-quality large diameter timber clones of E.urophylla×E.tereticornis.②Selection of medium/large diameter timber hybrid clones of E.urophylla×E.tereticornis was not recommended at the early stage because of the low correlation res

关 键 词：尾细桉 中大径材 基本密度 无性系选择 主成分分析 

分 类 号：S722.5[农业科学—林木遗传育种]