关键词: 森林生态系统, 年净初级生产力, 栖息地复杂程度, 小型兽类, 多样性

Abstract: This study focused on the effects of annual net primary productivity of forest ecosystem and habitat complexity of Huanglong Nature Reserve on the species diversity of small mammals. We divided Huanglong Nature Reserve into four census sites every 500 meters from the elevation of 2 000 meters , at 2 000 - 2 500 meters , 2 500 - 3 000 meters , 3 000 - 3 500 meters and over 3 500 meters respectively. The average annual net primary productivity of the forest ecosystem of each site was 24.9 MJ / (m²·a) , 21.5 MJ / (m²·a) , 17.5 MJ / (m²·a) and 14.1 MJ / (m²·a) respectively. The landscape of the sites in 2 000 - 2 500 meters and 2 500 - 3 000 meters were less complex , while the landscape of the remaining two sites were much more complex. These latter two sites vary a lot and is full of rocks covered with thick moss and many fallen trees. Over 500 snap traps were placed in each site during July and August 2001 and 200 small mammals were captured. The biomass of small mammals of each site was 661.0 g , 487.3 g , 451.7 g , 205.8 g per hundred snap traps respectively with species richness of 12 , 10 , 10 , 2 and the Shannon-Wiener diversity index as 3.04 , 2.81 , 3.06 and 0.75 respectively. The results indicated that there was close relationship between annual net primary productivity and habitat complexity and species diversity of small mammals. The species richness decreased with the reduction of the productivity of forest ecosystem. Similar relationship also existed between the productivity and habitat complexity and the biomass of small mammals. The species diversity of small mammals keeped a relatively high level in a complex habitat when the productivity was in a certain range. However , if the productivity was low enough it will become the limited factor for the species diversity of small mammals.

Key words: Forest ecosystem, Annual net primary productivity, Habitat complexity, Small mammal, Diversity