Abstract: The author studied the Leymus chinensis community and the Leymus Chinensis+Chloris virgata community under the influence of the dominant soil animal colony Lasisus flavus. The results revealed a vegetation compostion change by Lasisus flavus. The density of the Leymus chinensis in the two communities became higher, and the fruit was less, but heavier. Under the influence, the height of Leymus chinensis and Swartz became higher clearly, and so was the aboveground biomass and underground biomass.

Key words: Bacteria, Transport, Sorption, Model, Column experiment