【摘要】 <正> 草原兽类中,种类较多且数量较高者当推鼠类。它作为一类消费者,是草原生态系统的重要组分之一。为阐明这一类动物在该系统能量流通和物质循环中的作用,对其群落结构的研究颇为重要。有关此类研究,迄今国内尚少报道,国外近年虽有部分工作(Brown,1973;Hafner,1977;Grant and Birney,1979),但因鼠种和自然条件各异,其结构特征显然不同。更多还原

【Abstract】 Based on the investigation of the cross section from Kulongshan to Huanggeer-aobao in Baiyinlixe Pasture, six types of rodent communities were determined, among them Citellus dauricus + Cricetulus barabeiisis community and Microlus maximowiczii + Cricetulus barabensis + Citellus daurious community are two main types. The spatial pattern of the communities depends on the synthetic characteristic of the environment.The analysis of the similarity index between every two communities showed that degree of similarity on dissimilarity among rodent communites is related to the soil moisture content. This is the obvious characteristic of the spatial pattern of rodent communities in this region.Rodent species diversity index of the community is related to the variation of the environment.Rrodent biomass varies considerably in the different communities. Citellus dauricus is in a considerable amount of the biomass. It is evident that biomass of herbiverous rodent and of omniverous rodent correlated negatively.Citellus dauricus, Oohotona daurica and Crioetulus barabensis differ from one another considerably in life form. They do not compete against each other and are common species in rodent communities in the same region. In dune rodent community, there are three species of Cricetinae, Crioetulus barabensis, Phodopus swn-gorus and P. roborovskii. They are similar in life form, and their niches are classified principally according to the difference in food selection or in spatial selection.After the reclamation of the Stipa steppe, the original Citellus dauricus + Cricetulus barabensis community was replaced by the Cricetulus barabensis + Citellus dauricus community.(This paper is one of the reports of The Inner Mongolia Grassland Ecosystem Research Station, Academia Sinica.)更多还原