尾叶桉二代测定林家系的综合评选  

Studies on Index Selections of Eucalyptus urophylla Families

作　　者：李光友[1] 徐建民[1] 陆钊华[1] 杨伟东 杨国清 钟罗生 

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 [2]广东省国营雷州林业局,广东遂溪524348

出　　处：《林业科学研究》2005年第1期57-61,共5页Forest Research

基　　金：NAP和FRDPP项目(1991-2001)"桉树速生丰产林培育技术的研究与推广";雷州林业局和中国林科院热带林业研究所合作项目(1997-2001)"桉树种子园营建及杂种家系/无性系选育"中的部分研究内容

摘　　要：对49个家系的尾叶桉测定林各年度生长性状进行分析与遗传评估,结果表明:各年度树高、胸径和材积生长量在家系间存在极显著差异;分枝、干形和保存率在家系间存在显著差异;树高、胸径、单株材积、保存率的累积贡献率达95 45%,此4因子是综合评定家系时采用的;以家系群体平均选择指数I0为基准,两种选择标准下的家系材积增益,3年生时为7 63%～15 80%,4年生时为3 92%～10 39%,5年生时为6 08%～23 53%;以选择指数为指标,5年生时入选的5个优良家系是:109,113,66,81和100号。A family-test forest including 49 open-pollinated families of Eucalyptus urophylla was built at Leizhou Forestry Bureau in Suixi County,Guangdong Province to examine the genetic performance of the families.The characteristics of height,DBH,individual volume,stem form,branch and survival rate were compared among different families at 3～5 year,the results showed that:(1) The most superior families under index selections include No. 109, 113, 66, 81 and 100; (2) With the 10.20%～55.10% selected rate, the genetic gain of single volume of the superior families in family-test forest was estimated to be 7.63%～15.80% at 3rd years, 3.92%～10.39% at 4th years and 6.08%～23.53% at 5th years.

关 键 词：尾叶桉 家系测定林 指数选择 遗传增益 

分 类 号：S792.39[农业科学—林木遗传育种]