Dynamics and Diversity of Soil Fauna Community in Litter Layer of Chinese Fir Forest in Dagangshan Mountain

Soil fauna community and its dynamics during leaf litter decomposition were investigated by litterbag method(from Jan.to Dem.,2002) in Chinese fir pure and mixed forest(Chinese fir∶Chinese tuliptree=2∶1)at Dagangshan,Jiangxi Province.4 321individuals were collected from 168 litterbags,which belonged to 3 Phyla,11 Classes,30 Orders,the most dominant taxa of macrofauna was Hymenoptera,Ol.Opisthopora,Coleoptera and Diptera;of meso and microfauna were Collembola and Acariforms.Most were Omnivores,Phytophage and Predators in forest litter.The number of individuals of two type of forest was trended towards increasing during Jan.to Mar.,while the number of soil fauna group was trended towards increasing during Jan.to May in Chinese fir forest and Apr.to Jul.in mixed forest,the difference of individual and community number between two types of forest was not significant at α=0.05.Both the individual and group of soil fauna were in mixed forestChinese fir forest. Both soil fauna individual and group were in the order from high to low∶5 mm1 mm1/300 mm in three mesh size of litterbags.The diversity of soil fauna community was trended towards increasing,and dominance of Chinese fir forest was trended towards decreasing with the lapse of time.Soil fauna community was more heterogeneous at different forests.The colonized time of Ol.Opisthopora and Coleoptera were 8.42 and 6.45 months at mixed forest respectively,while Hymenoptera and Collembola were 9.48 and 7.91 months respectively at Chinese fir forest.