Abstract: In October 2008-June 2009, an investigation was made on the community structure, species richness, and seasonal variation of small mammals in seven types of habitats in Xishuangbanna, Southwest China. The relative densities of the small mammals were surveyed by trap-night method. A total of 127 individuals belonging to 10 species and 3 families were trapped, with an average capture rate being 6%. Within the small mammal community in study area, Chinese White-bellied rat (Niviventer confucianus) was the dominant, and its capture rate varied significantly among seasons (P=0.023) but insignificantly among habitats (P>0.05). Among the seven habitats, tropical rain forest had the highest species diversity index (H=1.91), tropical lower montane evergreen broad-leaved forest had the highest evenness (E=0.95), tropical seasonal moist forest had the highest dominance (D=0.94), while rubber forest had no small mammals captured. The highest relative population density was found in dry season. This study showed that the species diversity of small mammals in different types of habitats was related to the intensity of human disturbances, i.e., the higher intensity the human disturbances, the lower the diversity indices of the small mammals in the habitats. The changes in food abundance among seasons possibly affected the capture rate of small mammals.

Key words: Warm winter, Wheat, Sowing times, Spike differentiation