长期以来,北欧的挪威、芬兰、瑞典等国,一直袭用裸根苗木造林,也就是先在露天苗床培育苗木,然后将出圃的裸根苗木运到造林地栽植。这种方法育苗存在以下缺点:一、苗圃需要大量土地用来整床、播种; For a long time, Norway, Finland, Sweden and other countries in Northern Europe have been using naked root seedlings for afforestation. That is, they nurtured nursery stock in open-air seed beds first, and then planted bare nursery stock in nurseries to afforestation. This method has the following disadvantages nursery: First, the nursery requires a lot of land for the whole bed, sowing;