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.