毛白杨优良无性系选择研究

Selection of Good Clones of Chinese White Poplar

以鲁毛 5 0为对照 ,经过 8年的观测试验 ,选出憨白杨、38号、T173个毛白杨优良无性系。 3个无性系的育苗造林成活率达到 85 %～ 1 0 0 % ,单株材积生长量超过对照 73%～1 6 5 % ,均达到差异显著或极显著水平 ,材积连年生长量从第 4年开始迅速增加 。

Compaired with Lumao 50, Three good clones of Hanbaiyong, No.38 and T17 have been selected through eight years. The survial ration of these clones in the nursery and planting got 85%-100%. The individual volume grouth exceeded that of the control by 73%-165%. The levels of difference were significant or very significant. The current annual increment of volume began to increase fastly from the fourth year. The quality indexes were equal to the control or even over it.