关键词: 准噶尔盆地, 沙质荒漠, 啮齿动物群落, 短命植物, 资源利用

Abstract: The pattern of resource use by sandy desert rodent community was studied by approach of three dimensional niche, microhabitat, food and time during ephemeral existing period ranging from April to June. In microhabitat use, bothtwo bipedal species (overlap value in space: 0.878-0.908) and two quadrupedal species (overlap value in space: 0.708-0.863) with similar biological charactersshow relatively high convergence in space selection although some differences in for aging and moving places among these rodents were observed. In food use, in terms of measurement of food resource spectrum in each microhabitats and food spectrum from each species’ stomach contents, all of these species tend to for age ephemeral plants that are abundant in the period, which results in similar food preference (preference coefficients mainly within ±0.5) by these desert rodents. In combination with practical observation for activities of each species, t heoverlap values of three dimensional niche for each paired species were calculated, of them, more than half of these values (0.508-0.840) is over 0.5 of the theory of limiting similarity. For the reason, we consider, this is due o pulsing increaseof ephemeral biomass and the lowest population densities of each species from April to June, and thus that causes no significant resource partitioning for these paired species in the community, this situation in the period, therefore, might be called non-competitive coexistence. Some divergences in space-food resource use among these species in ephemeral existing period were considered to be produced bypredation risk. But these differences do not alter the fundamental pattern o resource use in the period.

Key words: Dzungaria basin, Sandy desert, Rodent community, Ephemeral