兴安落叶松是大小兴安岭地区的主要树种之一。随着该地区的开发,原始林被采伐,需要营造人工林的面积越来越多,苗木需求量很大。但是,许多苗圃在育苗时,尤其是在辽宁东部山区,常常遇到苗木早封顶的问题。幼苗在生长季即,5月末到6月初停止生长,形成顶芽,整个生长季苗木的地上部不再进行生长。直到秋后,苗木的高度只有3—4厘米,顶梢长个顶芽,形似“火柴杆”。如果这种苗木管理细致,第二年能够生长成苗。但是,由于播种当年苗木矮小,过早停止生长,杂草滋生;增加了苗圃作业量,延长了苗木出圃的苗龄和育苗周期,使育苗成本加大。 Larix Larix is ​​one of the major tree species in the Greater Xing’an Mountains. With the development in the area, the pristine forests are harvested, and more need to be created for the plantation, with a large demand for seedlings. However, nursery nurseries often encounter the problem of early seedling seedling during nursery, especially in mountainous areas of eastern Liaoning. Seedlings in the growing season, that is, from late May to early June to stop the growth, the formation of the top buds, seedlings throughout the growing season no longer grow. Until autumn, the height of seedlings only 3-4 cm, the top of a long top bud, shaped like “matchstick.” If this nursery stock management is careful, the second year can grow into seedlings. However, due to the short planting seedlings in the year of planting, the growth of weeds stopped prematurely, the nursery operations were increased, the seedling age and seedling raising cycle of nursery stock were extended, and the cost of seedling raising was increased.