Abstract: Mountain meadow is a kind of special ecosystem, it is not only a kind of important scenery resources, but also has certain ecological benefits. Many scholars studied the impact of tourist activities on meadow, but these researches were not still extensive and profound. In this paper, the impact of tourist activities on β diversity of meadow is studied using 5 indices in the Wutai Mountain. The results are as follows: (1) β diversity of meadow communities is impacted by tourist disturbance and interspecies competition. There is a big change of β diversity among different communities but a small one in the same communities; (2) The change trend of five diversity indices shows that the higher the distance gradient is, the less the common species among communities are, and the high their difference is; (3) Although five β diversity indices are calculated with different ways, their results are consistent, among which the result of BrayCurtis index is more accurate and detailed.

Key words: tourist disturbance, meadow community, inter species competition, &beta, diversity, the Wutai Mountain