Abstract: Rhizo box experiment showed that soil available Pwas significantly increased when decayed alfalfa was added, and soil Al Pand Fe Pwere also enhanced strikingly. The effects were enlarged when time extending. Pconcentration in wheat plants was increased significantly, and clearly related to the change of soil Al Pand Fe Pin non rhizosphere.

Key words: Alfalfa, Albic soil, Phosphorus, Rhizospheric effect, mean trophic level index, cluster analysis, community dynamics, index of relative importance, non-metric multidimentional scaling, multivariate statistical analysis