采用组织学鉴定法鉴定啮齿动物胃内含物,研究对栖息于短花针茅草原连续放牧区和轮牧区内的五趾跳鼠的食性.结果表明:1.五趾跳鼠是以植物性食物为主的杂食性啮齿动物,对植物性食物具有较强的择食性,放牧制度对该特性影响不显著;五趾跳鼠在短花针茅草原连续放牧区和轮牧区内的植物性食物组成相似度为0.71～0.88,采食频率最高的三种植物是冷蒿、无芒隐子草和木地肤.2.在植被条件较差时,连续放牧会促使五趾跳鼠更多地刨食植物根系,对草地的危害性增加.%The diet habits of Allactaga sibirica which inhibited in the continuous grazing plots and ro- tational grazing plots of Stipa breviflora steppe were studied using the identification method of rodent stomach content histology. The results showed,that: 1. Allactaga sibirica is an omnivorous rodent mainly foraging plant food, which has a strong preference for the plant food, the grazing systems has no obvious influence on this characteristic. The similarity index of the plant food composition of Allactaga sibirica in the continuous grazing plots and rotational grazing plots of Stipa breviflora steppe was 0.71 ～ 0.88. The most frequently grazed three kinds of plants were Artemisia frigida, Cleistogenes songorica and Kochia prostrate. 2. At the time of poor vegetation conditions, continuous grazing will lead to Allactaga sibirica dig and eat more plant roots, and increase the danger of the grassland.
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