杂种落叶松优良家系的选择

Superior family selection of hybrid larch

对8年生杂种落叶松8个家系的主要生长指标的分析结果表明:家系间树高、胸径、当年高生长差异极显著。(兴×日)24树高超对照62.13%,胸径超对照110.51%,当年生长量超对照96.87%,材积超对照466.36%。(日×长)13树高超对照57.65%,胸径超对照123.46%,当年生长量超对照115.62%,材积超对照526.88%,杂种优势非常明显。抗寒性实验结果表明:各杂交组合平均温度在-40℃以下,兴×日半致死温度低于日×长组合,可溶性糖含量高于日×长组合,综合生长性状及LT50结果,选择(兴×日)24、(日×长)13为最优家系。

The eight families growing index of eight years old hybrid larch analysis show that： tree height, DBH, the year growth and volume were extremely significant difference with in families. （Xing × Ri）24 tree height higher than the control 63.12%,the DBH higher than the control 110.51%, the year growth higher than the control 96.87%, the volume higher than control 466.36%.（Ri×Chang）13 tree height higher than the control 57.65%, the DBH higher than the control 123.46%, the year growth higher than the controll 15.62%, the volume higher than control 526.88%, heterosis was obvious. The cold hardiness experimental results show that the average temperature was below -40℃. LT50 of （Xing × Ri） was lower than the （Ri × Chang）, soluble sugar content was higher than the日×长. Considering the growth characteristics and the results of LT50, selection of （Xing × Ri）24, （Ri× Chang） 13 as the superior families.