杨树具有适应性强,速生丰产,繁殖容易,用途广的优点。其种子于初夏成熟,采集后当年播种育苗。由于生长期短,苗木质量往往达不到当年出圃的标准而被迫留植一年,这样对圃地有效利用和降低育苗成本都是十分不利的。若采用隔年种子,又因杨树种粒细小,含水量高,不易保存。在自然状态下,一般经1—3周即丧失发芽能力。因此,除采用种子库密封贮藏外,探索简易隔年贮藏方法,对远离种子库的寒冷而偏远地区的国营苗圃、社队苗圃开展杨树播种育苗是非常必要的。为此,我们于一九七七年至 Poplar has strong adaptability, fast growing, easy reproduction, the advantages of wide use. The seeds mature in early summer, planting sowing seedlings after the collection. Due to the short period of growth, seedling quality is often less than the standard of the year and was forced to leave for planting a year, so the effective use of nursery and reduce nursery costs are very unfavorable. If the use of seeds every other year, because poplar seed small, high water content, not easy to save. In the natural state, usually 1-3 weeks after the loss of germination. Therefore, in addition to the use of seed-bank sealed storage, it is necessary to explore poplar seedlings in State-owned nurseries and community-owned nurseries nurseries in cold and remote areas far away from the seed bank. For this reason, we arrived in 1977