造林良种化是现代林业发展的必然趋势。造林良种率已成为衡量一个国家林业发达程度的重要标志之一。油松是我省主要造林树种，每年造林6．6万hm2多。但是由于育苗、造林用种良莠不分，加之造林、管护不当，致使造林成活率低，成林不成材的现象十分突出。为了推广使用良种，提高 Afforestation is the inevitable trend of modern forestry development. Afforestation seed rate has become a measure of a country an important symbol of the level of forestry. Pinus tabulaeformis is the main afforestation tree species in our province, each year more than 66,000 hm2 afforestation. However, due to nursery, afforestation of good and bad species, coupled with afforestation, management and care improper, resulting in afforestation survival rate is low, the phenomenon of unforeseen forest stand out is very prominent. In order to promote the use of improved seed, improve