Abstract: This paper summarized the research progress in the effects of drying/wetting cycles on the mineralization, transformation, and losses of soil nitrogen
, and on the soil aggregate structure, swelling-shrinking characteristics, microbial activity, and microbial community. It was indicated that soil drying/wetting cycles could affect the mineralization and losses of soil nitrogen, and the transformation of soil nitrogen was closely related to the soil aggregate structure, swelling-shrinking characteristics, microbial activity, and microbial community. The future research directions were also proposed, with the focus on the relationships between soil nitrogen transformation and soil physical and microbial characters, especially the microbial transformation of fertilizer nitrogen, so as to provide theoretical references for the further study of soil nitrogen transformation processes and mechanisms.

Key words: Sandy pasture, Ecosystem, Grazing effects