在兴安落叶松原始老龄林的四个林型中,通过不同程度的地面干扰和对小哺乳动物的排除(靠铁丝网),研究了兴安落叶松天然幼苗的发生过程.结果表明:强度地表干扰对幼苗发生最有利,而仅去除下层植被但不去除枯枝落叶层的中度地面干扰仅在赤杨落叶松林中有利,而在其他三个林型中则效果不显著,甚至有害.动物啃食在除丛桦落叶松林以外的其他三个林型中对幼苗发生也有一定的影响. In the four forest types of Larix gmelinii original old-aged forest, the occurrence of natural seedlings of Larix gmelinii was studied through different degrees of ground disturbance and exclusion of small mammals (by barbed wire mesh). The results showed that: Seedling emergence was the most favorable, while moderate ground disturbance, which removed only the underlying vegetation but did not remove the litter layer, was only beneficial in the A. lanceolata forest, whereas in the other three forests the effect was insignificant and even detrimental. In addition to plexippus-Larix forest in other three forest types of seedlings have a certain impact.