青冈林土壤跳虫群落结构在落叶分解过程中的变化

Succession of collembolan community structure during decomposition of leaves in Cyclobalanopsis glauca forest

1993年 5月到 1 995年 4月 ,用落叶袋法研究青冈 ( Cyclobalanopsis glauca)落叶分解过程中跳虫的群落结构变化。用多样性指数、演替指数、相似系数分析跳虫在落叶分解过程中群落结构及其季节变化特点。青冈落叶分解经淋洗、养分固定和养分活化 3个阶段 ,分解常数分别为 k1=9.1 1 ,k2 =2 .57,k3=0 .4 3 (百分比 /月 )。跳虫在落叶分解过程中的集聚型分为 3组 :A组为落叶分解前期集聚的种类 ,B组为后期的种类 ,C组为中期或全过程的种类。分析讨论了落叶分解过程与跳虫功能群及群落结构变化的关系。

Changes in collembolan community structure during leaf litter decomposition were investigated with litter bag method from May 1993 to April 1995 in Cyclobalanopsis glauca forest. Successional changes in the community structure were expressed by the diversity index, succession index and similarity index. The community organization was compared among different stages of the decomposition of leaves. The pattern of mass loss of leaf litter was represented by three phases: leaching phase (0～7 months), immobilization phase (7～16 months) and mobilization phase (16～24 months). The decomposition rate of the phases were 9.11, 2.57 and 0.43 percentage month -1 using the decomposition constant ( K ). According to their successional patterns during the leaf 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 (C). The decomposition process in relation to the function of collembolan species and therefore the succession of collembolan community was discussed.