施肥补播对高寒草甸植物群落稳定性及种间关系的短期影响

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中图分类号：S812 文献标识码：A 文章编号：1007-0435（2026）01-0275-12

Abstract：Fertilization and reseeding are currently main restoration methods for degraded grasslands. Clarifying the impacts offertilization and reseedingon the stabilityof plant communities and the interspecific relationship in alpine meadows isof 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 corelation test were employed to comprehensively analyze the ecological niches and interspecific relationships of main species within the study area.The results showed thatfrom 2O22 to 2O24，the stability of plant communities in the alpine meadows decreased year byyear.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 biomassofforbs rebounded in the third year.After fertilization and reseeding，the ecologi cal niche breadth of main Gramineae increased，while the forbs decreased.Thevalues of ecological niche overlap among species increased，the degreeof interspecific association rose，and the anti-interference ability of the community enhanced.In conclusion，the measures of fertilization and reseeding had a positive efect on restoring the degraded alpine grassands and maintaining community stability within three years of restoration. However，the successon 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.

Key Words：Reseeding;Organic fertilizer;Community stability;Ecological niche;Interspecific associations

植物群落中物种通过相互作用和共存关系，对群落稳定性产生作用。（剩余20544字）