Arbuscular mycorrhizal fungi (AMF) can form symbiotic relationships with roots of plants and potentially affect nitrogen (N) cycling in cropping systems. However, it is unclear how AMF influence N₂O emissions and crop N assimilation, two key N cycling steps which are closely related to climate change and food production, under different soil management regimes. A microcosm experiment was conducted to test the effects of AMF on N₂O emission and plant N assimilation, with wheat as a model crop, under organic (straw) amendment in soils with different textures. We found that AMF suppressed N₂O emissions, promoted mycorrhizal N uptake and remobilization to grains and increase grain biomass under organic amendment in the sandy soil. However, AMF did not affect N₂O emission, although increased plant N uptake, but inhibited mycorrhizal N remobilization to grains under organic amendment in the clay soil. These findings highlight that AMF have different effects on N₂O emission and N translocation between sandy and clay soils. Appropriate soil management for mycorrhizal symbiosis in the cropping system can combat climate change and ensure food production.

丛枝菌根真菌（AMF）可以与植物根形成共生关系，并可能影响作物系统中的氮（N）循环。但是，尚不清楚AMF如何影响N ₂ O排放和作物N同化，这是在不同土壤管理制度下与气候变化和粮食生产密切相关的两个关键N循环步骤。以小麦为模型作物，在有机（秸秆）改良剂下，在质地不同的土壤中，进行了微观实验，测试了AMF对N ₂ O排放和植物N同化的影响。我们发现，AMF抑制了N ₂ O的排放，促进了菌根氮的吸收和向谷物的迁移，并在有机改良剂作用下增加了沙质土壤中的谷物生物量。但是，AMF不会影响N₂ O的排放，虽然增加了植物对氮的吸收，但是在有机土壤中，在土壤中，菌根氮向谷物的迁移作用受到抑制。这些发现表明，AMF对砂土和黏土之间N ₂ O的排放和氮的转运具有不同的影响。在种植系统中对菌根共生进行适当的土壤管理可以应对气候变化并确保粮食生产。