林木种苗是植树造林重要的物质基础和保障,在林业和生态建设中具有举足轻重的地位和作用,又具有长期性、区域性、超前性和社会公益性的特点。选育优良种源、家系、无性系一般需要十几年、几十年,从种子基地建设到进入结实需要十年左右时间,因此,林木种苗的优劣,影响的不是一年? Tree seedlings are an important material foundation and guarantee for afforestation. They play a decisive role in the forestry and ecological construction. They also have the characteristics of long-term, regional, advanced and social public welfare. Breeding good provenances, families, clones generally takes more than ten years, decades, from the construction of the seed base to enter the strong need about ten years time, therefore, the pros and cons of forest seedlings, the impact is not a year?