不同树龄水曲柳半同胞家系生长性状变异研究

为筛选优质的水曲柳种质资源，以吉林省三岔子林业局国家水曲柳良种基地的16年生水曲柳子代测定林75个半同胞家系为材料，分别在第4、11和16年对其树高、地径（胸径）和材积进行测定。方差分析结果表明，不同变异来源各指标均达极显著差异水平（P<0.01）；各指标表型变异系数变化范围为22.20%~63.30%，家系遗传力变化范围为0.796~0.981；相关性分析结果表明各指标间均呈极显著正相关；以材积为评价指标，按10%入选率对家系进行评价选择，初步筛选8个优良家系，入选的家系材积平均值比总平均值高0.007 m³，遗传增益为36.03%；该研究选出的优良家系可为良种登记提供基础，也可为种子园的改建提供材料。

Variation Analysis of Growth Traits in Different Growth Year of Half-sib Fraxinus mandshurica Families

In order to select high-quality germplasm resources of Fraxinus mandshurica, with 75 half-sib families of 16-years F.mandshurica at Sanchazi Forestry Bureau, tree height, basal diameter(diameter at breast height) and volume were investigated in the 4th, 11th and 16th growth years. By ANOVA analysis, there was significant differences among different variation source(P<0.01). The variation coefficients of phenotypic and heritabilities of different traits ranged in 22.20%-63.30% and 0.796-0.981, respectively. There was significant positive correlation among different traits. Based on 10% selected rate, according to volume to evaluate the families, eight families were selected as elite families. The average volumes of elite family were higher than average values of all the families by 0.003 m³, whose genetic gain were 36.03%. The elite families can supply basis materials for the improved variety register and the rebuilt seed orchard of F.mandshurica.