近年来,我省雁北地区从东北黑龙江省调入樟子松种子进行引种试验,为了使樟子松的引种获得成功,天镇县苗圃根据本地区春旱、日温差大,生长期短的自然条件,于今春采用塑料薄膜棚覆盖育苗,取得较好的效果。平均亩产苗30万株,平均苗高4厘米,主根长16.7厘米,根幅9.8厘米。现将试验情况介绍如下: In recent years, our province Yanbei region from the northeast of Heilongjiang Province introduced Pinus sylvestris seed introduction test, in order to make the introduction of Pinus sylvestris success, Tianzhen nursery according to the region spring drought, large temperature difference, short growth period Natural conditions, in the spring covered with plastic film shed nursery, and achieved good results. An average of 300,000 mu of seedlings per plant, the average height of 4 cm, the main root length of 16.7 cm, the root 9.8 cm. Now the test situation is as follows: