Abstract: This study was carried out in sandy grassland of erdos, Inner Mongolia during 1991 ～1995. Densities were investigated by rectilinear trap-day method in the middle ten days of April to October.A total number of 6325 rodents which belonged to 9 species,4 families were Captured by 101845 trap-days. They were ground squirrel(Citellus dauricus), three-toed jerboa(dipus sagitta),Mongolian five-toed jerboa(Allactaga sibirica), striped hamster(Cricetulus barabensis), desert hamster(Phodopus roborovskii),little Chinese jird(Meriones meridianus), clawed jird(M.unguiculatus),Norway rat(Rattusnorvegicus)and house mouse(Mus musculus). The population dynamics and species composition changed obviously with seasons and years.

Key words: Sandy grassland, Rodents composition, Population dynamics

摘要： 1991－1995年4～10月,每月中旬进行鼠类生态学定点研究,在内蒙古鄂尔多斯沙地草场调查鼠类的组成和数量,共布放101845个夹日,捕获鼠6325只。经鉴定隶属于4科9种,分别为达乌尔黄鼠、三趾跳鼠、五趾跳鼠、黑线仓鼠、小毛足鼠、子午沙鼠、长爪沙鼠、揭家鼠和小家鼠。该地鼠类混合种群数量季节变动和年度变化明显,五年间鼠类组成发生变化。

关键词: 沙地草场, 鼠类组成, 种群动态