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Arbuscular mycorrhizal (AM) fungi form symbiotic associations with most plant species in terrestrial ecosystems, and are conspicuously influenced by environmental variations.To reveal the impact of disturbance on AM fungus community under global warming, we examined the abundance and community composition of AM fungi in both soils and plant roots in a two-way factorial design of a warming-grazing system in an alpine meadow on the Qinghai-Tibetan Plateau.