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为了在较短期内培育出优质、高产的桦木苗木,以适应高山林区更新、造林的需要,马尔康林业局科研组,利用塑料大棚透光强、温度高、湿度大等有利于苗木生长、延长生长期等优点,进行了小面积的塑料大棚培育桦木苗试验,收到了较好效果。1978年6月23日播种,11月底调查,平均苗高13.9厘米,根径0.2厘米,主根长14厘米,顶芽饱满,长势旺
In order to cultivate high-quality and high-yield birch seedlings in a relatively short period in order to meet the needs of regeneration and afforestation in mountainous areas, the research team at Malcolm Forestry Bureau is able to prolong the growth of seedlings through the use of plastic sheds with high light intensity, high temperature and high humidity Growth and other advantages, a small area of plastic birch cultivation birch seedlings test, received good results. Seeds were planted on June 23, 1978 and surveyed at the end of November with an average height of 13.9 cm, a root diameter of 0.2 cm, a main root length of 14 cm, ample top buds,