为满足我局营造速生丰产林用杨树优良壮苗的需要,于1984年6月将在30个地区采集的大青杨种子在苗圃进行了播种育苗,当年平均茁高5～30厘米的有22个地区的种子,平均莳高50～80厘米的有8个地区的种子。在1985年春,随起苗随造林,株行距2×3米,将八个地区的种源苗在相同地块上 In order to meet the need of our bureau to create good and strong seedlings of poplar with fast-growing and high-yielding forests, the poplar seed collected from 30 areas in June 1984 was planted and nursery in the nursery. The average height of the poplar was 5 to 30 cm Seeds of 22 areas, with an average of 50-80 cm, are planted in 8 areas. In the spring of 1985, planting seedling with afforestation, spacing of 2 × 3 meters, the seedlings of eight areas in the same plot