杂种落叶松的生长表现及遗传增益

Growth Performance and Genetic Gain of Hybrid Larch

通过对杂种落叶松子代测定林(16年生)10个家系的树高、胸径及立木材积进行分析,结果表明:3个性状家系间和家系内都存在着丰富的变异,高生长量最大的家系与最小的家系相差1.3倍,胸径相差1.4倍,材积相差2.3倍,各性状家系内单株间相差1倍多。树高、胸径及立木材积的家系遗传力分别为0.741、0.718和0.642,遗传增益分别为15.7%、20.8%和41.5%。筛选出4个优良家系:兴7×日77-2、日5×长77-3、日5×长78-3和日5×兴9,其树高、胸径及材积较当地落叶松分别提高27.9%、42.9%、131.5%,22.6%、28.1%、79.4%,18.8%、28.3%、78.9%和14.1%、26.8%、78.2%。

A study was conducted to analyze the height, diameter at breast height and volume of ten families from sixteen - year - old hybrid larch progeny testing forests. Result showed that there were abundant variations in these three characters between and within families. The family with the largest height increment was 1.3 times higher than that with the lowest one, and the difference of diameter was up to 1.4 times and that of volume was 2.3 times. The differences for each character between individuals were more than one time within families. The family heritability of height, diameter and volume were 0. 741,0.718 and 0. 642, respectively, and their genetic gain were 15.7%, 20.8% and 41.5%, respectively. Four elite families were screened out： Xing＇ an7 × Japan77 - 2, Japan5 × Changbai77 - 3, Japan5 × Changbai78 - 3 and Japan5 × Xing＇an9, whose height,diameter and volume were 27.9%, 42.9%, 131.5% ; 22.6%, 28.1% , 79.4% ; 18.8%, 28.3%, 78.9% ;14.1%, 26.8%, 78.2% more than those of the native larch respectively.