关键词: 布氏田鼠, 生境, 生态因子, 地形, 植被, 土壤

Abstract: An investigation on Brandt's voles(Microtus brandti Radde)during a population low was made at Amugulong, Inner Mongolia from Sept. to Oct., 1983 and from Apr.to Sept., 1984.It dealt with the characteristics of habitats the vole selected and the effect of the main ecological factors.Eight types of habitats were selected on an area of about 20km² for studying the density of the vole.The numbers of its burrow openings were counted every month to analyse tha variation of density in different habitats and seasons. It was shown that the shallow ditch with a sedge (Carex duriuscula)grassland was the optimal habitat for the voles.Some ecological factors affecting the density of the voles were analysed. They were topography,grassland type,height of herbosa,moisture content of plant,coverage of vegetation,productivity of grassland,soil moisture and soil hardness,etc.The stepwise regression was used to analyse the comprehensive factors in various seasons. Results show that topography, food sources and the height of herbosa are correlated to the selecting of habitats by Brandt's voles.

Key words: Brandt's vole, Microtus brandti, Habitat, Ecological factor, Topography, Vegetation, Soil