兴安落叶松林下植被、枯枝落叶层和动物对幼苗发生影响的研究

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.

The Effect of Understory,Litter and Small Mammals on Seedling Occurrence of Larix gmelini

By means of different ground disturbances and exclusion of small mammals with wire mesh in primitive old-growth Larix gmelini forests of four forest types,the seedling occurrence of Larix gmelini is studied.In four forest types,the intensive ground disturbance that both understory and litter are cleared away is favourable to the seedling occurrence.However,the moderate ground disturbance that only understory is cleared away has some positive effects on Ass.Alnus mandshurica,Larix gmelini,but has no remarkable,even negetive effects on other three forest types (Ass.Ledum pulastre,Larix gmelini,Ass.Betula fruticosa,Larix gmelini,Ass.Herbage,Larix gmelini).The effects which made by animal foraging on seedling occurrence in some types except Ass.Betula fruticosa,Larix gmelini are also observed.