关键词: Chihuahua荒漠, 啮齿动物, 群落动态, 年间变动, 趋势

Abstract: The data are presented on the time series of number of species,number of individuals，biomass，Shannon and Simpson index of species diversity and evenness of the rodent community in the Chihuahuan Desert of North America from November of 1977 through June of 1985，which was composed of 3266 individuals of 17 species of common heteromyid and murid (cricetid) and rare sciurid and geomyid．A time series analysis method is applied to characterize interannual fluctuatons and trends of the above 6 variables．The results revealed that: 1)all of the variables fluctuated interannually responding to the physical environment，but the fluctuations of number of individuals and biomass were greater than others．Andevenness kept relatively stable；2)all of the 17 species of rodents could not be found in the community at the same time and number of species was ranging from 3 to 13；3)number of species，humber of individuals and two species diversity indexes trended to increase during the research period，but no any trends were found in biomass and evenness；4)the rations of population density and biomass of the two dominant species (D．merriaml and D．spectabilis)and their sum in the interannual time series of number of individuals and biomass of the rodent community were stable，and it could be explained by the monopolizing allocation patterns of energy among the species in the rodent community．

Key words: Chihuahuan Desert, community dynamics, interannua1 fluctuations, rodents, trends