内蒙古阿拉善荒漠主要啮齿类种群生态位

对内蒙古阿拉善荒漠儿种主要啮齿动物的种群生态位研究表明，子午沙鼠的生态位宽度指数最高，为0．786．该种对7种资源等级的利用具有一定的普遍性。在7种生境中均有分布，且以人工草地和农田生境的数量最高，天然草地的数量最低；五趾跳鼠和三趾跳鼠的生态位宽度指数次之，分别为0．649和0．610。长尾仓鼠和黑线仓鼠以及五趾跳鼠和巨泡五趾跳鼠的生态位重叠指数最高，分别为0．857和0．828。说明前两种鼠和后两种鼠对其所栖息的环境中的资源利用方式趋于一致，并存在一定的竞争。短尾仓鼠和长尾仓鼠，短尾仓鼠和黑线仓鼠，三趾跳鼠和三趾心颅跳鼠的生态位重叠指数次之，分别为0．700，0．700和0．706。

THE POPULATION NICHE OF PRINCIPAL RODENTS IN THE ALASHAN DESERT REGION OF INNER MONGOLIA

Studying on the population niche of 11 species principal rodents in the Alashan desert region of Inner Mongolia showed that the ecological niche breadth index of Meriones meridianus is the highest, equal to 0.786, and it distributes into 7 kinds of habitats to utilize the resources. The ecological niche breadth indexes of Allactaga sibirica and Dipus sagitta are the second, equal to 0.649 and 0.610. The ecological niche overlap indexes of Crieetulus longieaudatus and Crieetulus barabensis, Allactaga sibiriea and Allactaga bullata are higher than others, equal to 0.857 and 0.828,which showed that they utilize similar environmental resources in competing. The ecological niche overlap indexes of other 6 species rodents are the second, equal to 0.700, 0.700, and 0.706.