Abstract: Changes in collembolan community structure were investigated respectively in the litter under the three species of trees,Cyclobalanopsis glauca (Cg), Pinus massoniana (Pm) and Quercus acutissima (Qa) in the same forest ecosystem during decomposition of the litter from April 1993 to April 1995.The decomposition process of Cg litter consisted of three phases:leaching phase,lasting from start of the experiment to the 7th month;immobilization phase,from 7th to 16th month;and mobilization phase,from 16th to 24th month.On the other hand,there were no such distinguishable phases during the observing period in both Pm and Qa litter.The greatest collembolan abundance and diversity index occurred in Cg litter. According to their occurring patterns during the litter decomposition, the collembolan species could be recognized as following three categories:the earlier colonizers (A), the later ones (B) and the long-term colonizers or those appeared only in the middle stage ©. Tomocerus sp., Isotoma sp. And Homidia hangzhouensis in the category A, and Folsomia octoculata, Pseudosinella sp. and Folsomina onychiurina in these litter category were shared by the 3 types of litter respectively. There were no common species in the category C.

Key words: Collembola, community structure, succession, arbore, litter decomposition