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我省属青藏高原大陆性气候,存在无霜期短、高寒、春旱、霜冻、冰雹、大风等不利条件。这样的自然条件,单靠露地育苗,显然不能适应“三北”防护林体系建设的需要。随着塑料大棚油松育苗的方式在我省的发展,从1978年以来,我们在大通县鲍二大队也进行了塑料大棚河北杨、毛白杨扦插育苗试验,收到良好效果。河北杨扦插育苗成活率(无论处理或不处理)均达100%(梢头部除外),毛白杨处理的成活率达84—93%。
My province is a continental climate of the Qinghai-Tibet Plateau, there are frost-free period is short, cold, spring drought, frost, hail, wind and other unfavorable conditions. Such natural conditions can not meet the needs of building the “Three Norths” shelterbelt system by relying solely on open field nurseries. With the development of plastic greenhouse pine seedling in our province, since 1978, we also carried out plastic greenhouses in Hebei Province, Populus euphratica cuttage seedling raising experiment in Baotou Second Team, Datong County, received good results. Poplar seedling survival rate of Hebei (with or without treatment) were up to 100% (except for the head), Populus tomentosa survival rate of 84-93%.