关键词: 土壤动物, 群落结构, 落叶松纯林, 落叶松白桦混交林, 塞罕坝

Abstract: [Objective] The aim of the study was to compare soil meso- and microfaunal communities of litter layer between pure larch plantation and mixed forest in Saihanba area, and to analyze the relationships between soil fauna and environmental factors. [Method] An investigation of soil fauna was carried out in two plantations in July 2013. Tullgren funnel method was used to extract soil fauna. Adiitionally, physical and chemical properties in litters of two plantations were measured. Then, correlations between soil faunal communities and environmental factors were analyzed using statistical analysis software. [Results] A total of 11 609 soil meso- and microfauna belonging to 11 Orders and 24 groups were extracted. There were 4 529 individuals belonging to 18 groups in the pure plantation, and 7 080 individuals belonging to 19 groups in the mixed forest, respectively. The dominate groups were Collembola and Acarina in the two forests. The group numbers and density of soil fauna in the mixed forest were higher than those in the pure plantation while the opposite was ture for Shannon-Wiener diversity index and Pielou evenness index. Correlation analysis showed that the main factor affecting soil faunal diversity was total nitrogen content in litter. [Conclusion] Mixed forest was converted from pure forest, having larger number of soil fauna. Therefore, single structure of larch pure forest should be avoided in the future artificial management.

Key words: soil fauna, community structure, pure larch plantation, mixed forest, Sihanba area