Bacteria play a major role in environmental processes. However, the spatial and seasonal variations and environmental impact factors on different bacterial groups have been poorly studied. In the present study, we compared the spatial and seasonal variations of two bacterial groups (Acidobacteria, Actinobacteria) from Early Snow Melt and Late Snow Melt locations in Alpine tundra by CE-SSCP method. We examined correlation between the two groups and environmental factors. The results revealed that pH of soil is the essential factor for structure of two bacterial groups. The SSCP pattern of Acidobacteria is very similar to the overall bacterial communities in our previous study, while both bacterial communities are highly influenced by seasonal variations with an independent pattern.

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