Abstract: In the steppe of Inner Mongolia, China, a comparative study on soil-vegetation system of different zones surrounding the fairy ring fomed by a kind mushroom fungus- Tricholoma mongolium(Imai.)was carried out. These zones included the inside, green zone, scorched zone and outside of the fairy ring. The results showed that plant biomass aboveground in green zone was increassed than in normal vegetation of outside ring, and content of nutrient elements and chorophyll in Leymus chinensis was also increased in the green zone. But plant growth was restrained in the scorched zone. Plant specties composition was changed on the fairy ring. Soil nutrient, especialy available N and P in different zones of fairy ring had a significant variance. Effect of T. mongolium mycelia growth on physical and chemicd characteristics and biological activities in soil caused the ecological phenomena of fairy ring. There was a close relationship between beneficial microbe and T. mongolium fungus.

Key words: Fertilization, Phosphomonoesterase, Phosphodiesterase, Phosphotriesterase, Meadow brown soil