长白山次生林演替过程中土壤动物群落的变化

通过对长白山白河局不同林龄的次生林土壤动物的组成进行比较。探讨了土壤动物群落随森林采伐更新演替的变化以及演替阶段(增长期、过渡期和稳定期)．研究表明，不同类群土壤动物的演变趋势是腐食类群数量相对较多，其变化趋势接近植被的变化规律，均是经过上升、下降，最后达到稳定；植食类群演替前期在整个群落中所占比例较高，随着演替年代的增加，比例呈下降的趋势；捕食类群经过100年左右的演替，数量明显增加；从昆虫类群组成来看，林龄较短者，未稳定的类群数较多，林龄较长者，未稳定的类群较少．

Dynamics of soil fauna communities during succession process of secondary forests in Changbai Mountain

The secondary succession of forest communities in Changbai Mountian might be divided into three stages,i.e.,aggradation,transition,and steady states.The last stage will be arrived after about 100 years.At same time,the succession dynamics of various soil fauna groups were shown as:Saprophagous group was more abundant than other fauna groups,and its change trend was similar to the development of forest vegetation after disturbing;Phytophagous group had a higher amount during the prophase of forest succession,which was decreased with forest succession;the quantity of Carnivorous increased obviously after about 100-years-succession;and the composition of insect groups was that the unstable groups was more abundant when the forest was younger,but less abundant when the forest was older.