从1974年开始,六盘山区对落叶松大面积育苗,截止1984年已育出苗木500多亩,计4600多万株,供造林36000亩,已成林28000亩,1967年营造的人工林高14.8米,胸径21厘米,生长良好,是广大群众喜爱的造林树种。但由于落叶松种粒小,在幼苗期非常嫩弱,最容易遭受病害、日灼等灾害和恶劣环境的影响,育苗不见苗的现象常有发生。 Since 1974, large areas of larch seedlings have been raised in Liupan Mountain. As of 1984, 500 mu of seedlings have been bred and more than 46 million trees have been planted for afforestation of 36,000 mu and 28,000 mu of forests have been planted. The plantation height of 1967 14.8 meters, 21 centimeters diameter, good growth, is favored by the masses afforestation species. However, due to small larch seedlings, very weak in the seedling stage, the most vulnerable to diseases, sunburn and other harsh environments and harsh environment, the phenomenon of seedlings do not see the seedlings often occur.