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朔县薛家庄林场,二十年来营造了近十万亩小叶杨林,由于部分地段立地条件恶劣,致使一些林分形成“小老树”。为了探求改造途径,1977年进行了樟子松育苗试验,以期作为第二代更替树种,然而在育苗过程中迂到猝倒型立枯病严重发生,幼苗大量死亡,成为育苗成败的关键问题之一。为了摸清规律,总结经验,初步进行了观察,
Shuo County Xuejiazhuang Forest Farm, 20 years to create a nearly 100,000 mu Ye Xiaolin, due to poor conditions in some sites, resulting in the formation of some forest “little old tree.” In order to explore the way of transformation, in 1977, the Pinus sylvestris var. Mongolica test was conducted in order to replace the second-generation tree species. However, in the process of nursery, the sudden-onset damping-off blight occurred seriously and a large number of seedlings died, which became the key problem of seedling success or failure one. In order to find out the law, summarize the experience, preliminary observation,