以内蒙古大兴安岭北部兴安落叶松原始林、渐伐更新林、皆伐更新林3种森林类型为研究对象, 对其天然更新幼苗的大小级结构及空间分布格局进行了研究。结果表明:原始林与渐伐更新林的更新幼苗大小级结构均属于稳定型种群, 有利于种群的连续更新;而皆伐更新林幼苗大小级结构属于下降型种群, 不利于种群的连续更新。3种森林类型的幼苗分布格局均呈聚集分布, 聚集程度等级由强到弱顺序为:原始林>皆伐更新林>渐伐更新林。并提出了兴安落叶松合理经营管理的建议。

Research work was conducted on the size-class structure and the spatial distribution pattern of the natural regeneration seedlings, which belong to the virg in forest, successive cutting forest and clear cutting forest of Larix gmelinii in north Daxing' anling in Inner Mongolia.The results show that the size-class st ructure of the natural regeneration seedlings bo th in the virgin forest and in the successive cutting forest belong to the stable structures of the population, which favors the continuous regeneration of the population, w hereas the size-class seructure of the natural regeneration seedlings in the clear cutting forest belongs to the declined st ructure of the population, which goes against the continuous regeneration of the population.The spatial distribution pattern of the natural regeneration seedlings in the three typs of forests assumes an aggreg ate distribution.And by the degree of agg regate distribution the highest of the three forest types is the virgin forest, the clear cutting forest comes second, the successtive cutting forest third.This paper also puts forw ard some sug gestions about management of Larex gmelinii.