4 Conclusion
The research used the method of replacing space with time, and analyzed the change characteristics of vegetation and soil nutrients in succession of grassland desertification found that, grassland vegetation and soil had undergone significant changes, especially total coverage, AGB, Shannon-Weiner index, soil bulk density, soil organic matter and total nitrogen. Based on N/P, the nitrogen was the main factor limiting the productivity of grassland, and the limitation was more prominent in the process of grassland desertification. The results could provide theoretical basis and data support for curbing grassland desertification and inducing forward succession of desert grassland.