氮磷添加与AMF对宁夏荒漠草原优势植物生物量和C:N:P的影响

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中图分类号：S812 文献标识码：A 文章编号：1007-0435（2026）02-0663-07

Abstract：Nitrogen（N） and phosphorus （P） additions are vital management methods to aleviate plant nutrient limitation and improve grassland productivity.Soil nutrient enrichment may potentially alter the symbiotic relationships between plants and arbuscular mycorrizal fungi （AMF）. This study conducted a three-factor experiment to study the independent and interactive effects of N and ΔP additions and AMF on the biomass and C：N：P of Agropyron mongolicum and Astragalus melilotoides inthe desert steppe in Ningxia.We used a kind of fungicide（benomyl） to regulate native AMF activities. Our results showed that N and P additions significantly increased the aboveground biomass of A . mongolicum and A . melilotoides，but AMF did not alter them. AMF significantly reduced the aboveground biomass of A . mongolicum under P alone addition and both N and P addition treatments. AMF increased the C：N of A . mongolicum plants and the C：P of A . melilotoides.P addition significantly reduced the C：P and N：P of two plants，and alleviated the P limitation of A . mongolicum.In summary，compared with AMF，N and P addition was more beneficial to dominant plants biomass in the desert steppe in Ningxia，and could alleviate the nutrient limitation of A . mongolicum and A . melilotoides. Key Words：Agropyron mongolicum;Astragalus melilotoides;Ecological stoichiometric ratio;Nutrient content; Phosphorus limitation

氮（Nitrogen，N）、磷（Phosphorus，P）是制约天然草原植物生产力的主要土壤限制因子[1-2]。（剩余10775字）