种苗是营林更新的物质基础,种籽则是基础的基础。由于林木种籽受结实周期性的影响,尤以天然母树林为采种来源的云杉、落叶松、冷杉、桦树等主要高山更新树种,其结实周期长而明显。因此,需要在结实丰年采集足够数量的林木种籽贮藏,以备种子欠收年份也能有充足的种籽,保证营林更新及造林用种需要。但是,在林木种籽的贮藏过程中,由于贮藏的方法不当,加之设备简陋,使种籽质量处于听其自然变化的状态,造成云杉、落叶松、桦木等中小粒种籽贮藏年限 Seedlings are the material basis for the renewal of forests and seed is the foundation of the foundation. As the tree seed is affected by the strong periodicity, the main alpine regeneration species such as spruce, larch, fir and birch, which are natural mother trees, are planted in long, obvious periods. Therefore, a sufficient number of forest seed stocks need to be collected during a good harvest to prepare enough seeds for the year of seedling failure, so as to ensure the need for reforestation and reforestation purposes. However, during the storage of tree seeds, due to the improper storage method and the poor equipment, the quality of the seeds is under the condition of natural change, resulting in the storage period of medium and small grain seeds, such as spruce, larch and birch