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    Eleven superior families were selected according to their timber traits with the methods of the Least Significant Range,the trait performance analysis and the estimation of breeding value. Their real gains were between 46.35% and 108.65% with the average value of 64.21%; their genetic gains were between 25.58% and 59.96% with the average value of 35.44%.
    采用LSR法、性状表现水平分析法、一般配合力相对效应值分析法和育种值评定法等4种方法进行优良家系评选,以材积性状作为选优指标,评选出11个优良家系,其现实增益达46.35%~108.65%,平均为64.21%,遗传增益达25.58%~59.96%,平均为35.44%。
    (2) There are also some effect of special combining ability and back crosses among the detinite parent's combinations;
    结果表明:①5个数量性状主要受一般配合力效应所控制,②在特定亲本的交配组合间特殊配合力及反交效应也有一定影响;
    Genetic factors controlling hybrid vigor, as well as relationship of general combining ability with general hybridizing ability of PEE, was studied. In addition, effects and problems to produce hybrid seed were also discussed in this paper.
    文中还从理论上探讨了控制杂种优势的遗传因素、湿地松一般配合力与一般杂交力的关系,分析了杂交制种的效果和存在问题
    The analysis result of combining ability showed that the cross between provenances had a significant difference predominantly due to the GCA effect.
    配合力分析结果表明 :杉木种源间杂交组合生长量存在显著的遗传差异 ,主要受一般配合力效应的影响 ;
    Interaction effect between sites and crosses also existed to a certain extent for all traits, and the effect was significant for diameter at breast height and density, the ratios of additive variance to total genetic variance were from 96 41% to 100% for diameter at breast height, volume, straightness, density, and resistance, when mean square of general combining ability (GCA) was significantly greater than that of specific combining ability (SCA).
    所有研究性状均存在着一定程度的地点与基因型互作 ,其中胸径、基本密度均达到了显著以上水平 ; 在一般配合力 (GCA)均方差显著地大于特殊配合力 (SCA)均方差的前提下 ,胸径、材积、基本密度、通直度、抗风性的加性方差占总遗传方差的 96 .4 1%~ 10 0 %。
    Three quantitative characters, i.e . tree height, dbh, volume were focused, and their effects were discussed in detail. It was found that the GCA, SCA and specific reciprocal cross effects (SRE) were most important, and female effect (FEM) and male effect (MAL) were less important.
    结果表明 ,这些性状主要受一般配合力 (GCA)、特殊配合力 (SCA)和特殊正反交效应(SRE)的控制 ,母本效应 (FEM)对弯曲度有较小作用 ,而父本效应 (MAL)对所有性状影响甚微。
 

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