育苗生产，是一项周期性强，季节性长，环节繁多和技术性更强的生产，其生产的苗木，在很大程度上关系到绿化的成败。笔者通过实地调查发现，近１０年来塞罕坝用于绿化的苗木，即使立地条件较好，造林管理严格，在一定程度上出现当年成活率达９０％以上，第２年保存率则有不同 Seedling production is a cyclical, seasonal, multi-faceted and more technical production, the production of seedlings, largely related to the success or failure of greening. According to the field survey, the author found that the seedlings planted by Saihanba for greening in the past 10 years have been verified to have achieved a survival rate of over 90% in the current year and a slight difference in the second-year preservation rate even though site conditions are good and afforestation management is strict