湿地松自由授粉家系的早期评定  

The Early Selection of OPen Pollinated Families of Slash Pine

作　　者：姜景民 孙海菁 刘昭息 

机构地区：[1]中国浙江富阳林业科学研究院亚热带林业研究所

出　　处：《林业科学研究》1995年第5期574-581,共8页Forest Research

基　　金："八五"国家攻关项目

摘　　要：对位于浙西北的９年生湿地松自由授粉子代测定林进行了生长性状的逐年观测和７年生时形质调查及材性测定，估算了遗传参数。各家系间的高、径生长和干形、分枝角等性状表现出显著的差异，家系平均遗传力也都达中等程度以上（ｈ２ｆ＞０．４）。对生长性状进行了年度相关和早晚期选择效率分析，表明第５～７年是适宜的早期选择年龄。据树高、胸径、树干通直度、分枝角度四种性状建立的多性状选择指数表明，不可能对它们进行同步改良，生长性状应是主要选择因素。在等权重情况下，对通直度和分枝用进行约束，选择出三个以建筑材为目的的优良家系。Analyses was conducted based on the data from a 9-year-old open-pollinatedprogeny test of P. elliottii in northwestern Zhejiang.The measurement of growth traits weretaken annually for the first 5 years and at the 7th and 9th year,while the form traits were as-sessed visually at the 7th year.There were significant family variations in height,stem diame-ter,stem straightness and branch angle, and middle to high level family-mean heritabilities.The age trends of growth traits in family variances,juvenile-mature correlations and responseto early selection were examined,5 to 7 years old was the optimum age for early indirect se-lection. Genetic gains were examined on the height,stemdiameter,stem straightness,andbranch angle in selection indices. The results suggested that it is impossible to achieve sub-stantial simultaneous improvement in both growth and form. Based on restricted indices con-structed by using equal emphasis weights,three superior families were selected.

关 键 词：湿地松 自由授粉 遗传分析 

分 类 号：S791.246[农业科学—林木遗传育种]