尾叶桉家系木材性状的变异研究  

Study of variation of six wood traits among Eucalyptus urophylla families

作　　者：李光友[1] 徐建民[1] 杜志鹄[1] 韩超[1] 王伟[1] 李宝琦[1] 朱鹏[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广东广州510520

出　　处：《中南林业科技大学学报》2010年第8期87-91,共5页Journal of Central South University of Forestry & Technology

基　　金：国家"十一"五项目专题(2006BAD01A1504);热林所基本业务费项目(2007-08);广东省自然基金项目(05004910)

摘　　要：对75个月生32个尾叶桉家系的6个与木材相关的性状进行了研究。6个木材性状在家系间存在显著或极显著差异,说明通过家系选择可以获得性状优良的家系/无性系;木材基本密度、木材含水量、纤维宽、纤维长宽比与生长、形质性状间的相关关系不显著,表明该4个研究性状能各自遗传,可以分别独立选择;纤维长与树高、胸径及单株材积相关关系达到显著或极显著水平,说明纤维长度随树龄增长而增加,材性逐渐得到改善;所有木材性状间的遗传力均在0.5左右,说明各性状受到中等水平的遗传控制;水分含量、基本密度、树皮厚度、纤维长宽比性状的遗传变异系数较高,表明尾叶桉家系在4个性状上具有较丰富的遗传变异,进行性状遗传改良可获得较高遗传增益,按25%入选率,预期遗传增益可达5.68%～17.66%。The six wood traits of 32 Eucalyputs urophylla families at 75-month-old were studied.There are obvious differences or very significant differences in all 6 wood traits among 32 families,and this verifies that through selection,the families or clones with good traits can be obtained.The wood basic density,wood moisture content,fiber width,ratio of fiber length to width are correlated with the wood growth and form-quality traits at a general level,and this shows that the 4 traits can be inherited according to Mendel＇s Law and selected respectively.The fiber length are correlated with tree high,diameter at breast height and individual volume at a significant level or a very significant level,and this indicates that the fiber length increases as tree age grow.The wood traits are improved along with the increase of tree age.The heritability of all wood traits are about 0.5,and this shows that all wood traits are under genetic strong control;and among the six traits,water content,basic density,bark thickness and ratio of fiber length to width have higher genetic variation coefficient（%）,and this proves that Eucalyputs urophylla families have more abundant genetic variation and the genetic improvement to the families can produces higher genetic gains.The average genetic gains can reach 5.68 % ～17.66 % for wood moisture content,basic density,bark thickness and ratio of fiber length to width if the selection rate of the superior families are 25%.

关 键 词：尾叶桉家系 木材性状 木材基本密度 木材含水量 纤维长宽比 

分 类 号：S792.39[农业科学—林木遗传育种]