Fertilization and reseeding are currently main restoration methods for degraded grasslands. Clarifying the impacts of fertilization and reseeding on the stability of plant communities and the interspecific relationship in alpine meadows is of great significance for grassland restoration. In this study， after applying organic fertilizer and reseeding in the alpine meadows of Maqu County， the structure and composition of plant communities were investigated. The Euclidean distance was used to evaluate the community stability， and methods such as the Levins method， variance ratio method， and Pearson correlation test were employed to comprehensively analyze the ecological niches and interspecific relationships of main species within the study area. The results showed that from 2022 to 2024， the stability of plant communities in the alpine meadows decreased year by year. After fertilization and reseeding， the increase in the Euclidean distance was 7% lower than the control， significantly reducing the declining rate of community stability （P<0.05）. After fertilization and reseeding， the proportion of Gramineae and Cyperaceae increased by 122.9% and 73.7%， respectively， and the community stability and the proportion of the biomass of forbs rebounded in the third year. After fertilization and reseeding， the ecological niche breadth of main Gramineae increased， while the forbs decreased. The values of ecological niche overlap among species increased， the degree of interspecific association rose， and the anti-interference ability of the community enhanced. In conclusion， the measures of fertilization and reseeding had a positive effect on restoring the degraded alpine grasslands and maintaining community stability within three years of restoration. However， the succession process of plant community was not a one-way improvement， and measures needed to be taken in the later stage to delay the rebound of stability.

Reseeding  /  Organic fertilizer  /  Community stability  /  Ecological niche  /  Interspecific associations