大径材杂种落叶松优良家系选择

为选择适宜大径材培育的杂种落叶松优良家系,以40年生全同胞子代测定林31个家系为研究对象,对其生长性状、干形性状、遗传力及遗传增益进行了测定。结果表明:生长性状单株遗传力整体高于干形性状,树高单株遗传力平均值超过0.5,胸径平均值超过0.4,中央直径平均值超过0.3,材积的平均值超过0.5。胸径和材积的相关系数为0.974,因此胸径基本可以代表材积,选择时可作为首要生长性状,树高遗传力可作为次要生长性状。性状选择顺序依次为胸径、树高、通直度、侧枝粗,在3个试验区选择出日5×长77-2、日77-2、兴7×日77-2等3个优良家系。

Selection of Superior Families for Large-Diameter Timber of Hybrid Larch

In order to select good families of hybrid larch suitable for large-diameter timber cultivation,31 families of 40-year-old all-sib progeny forests were selected as the research objects,and growth traits,stem shape traits,heritability and genetic gain were determined.Result shows that the overall heritability of growth traits per plant is higher than that of dry traits.The average tree height per plant heritability exceed 0.5,the average DBH exceed 0.4,the average central diameter exceed 0.3,and the average volume exceed 0.5.The correlation coefficient between DBH and volume is 0.974,so DBH can basically represent volume,which can be used as the primary growth trait in selection,and tree height heritability can be used as a secondary growth trait.According to heritability and correlation,the order of trait selection is as follows:DBH,tree height,straightness,and lateral branch thickness.According to the comparative analysis of population productivity and the productivity and morphological traits of larch plantations in the area,three excellent families were selected in the three experimental areas,namely,Larix olgensis‘5’×Larix olgensis‘77-2’,Larix kaempferi‘77-2’,Larix gmelinii‘7’×Larix kaempferi‘77-2’.