Two rice cultivars (Xiushui 09 and Chunyou 84) were used to evaluate the effects of various soil oxygen (O₂) conditions on soil nitrogen (N) transformation, absorption and accumulation in rice plants. The treatments were continuous flooding (CF), continuous flooding and aeration (CFA), and alternate wetting and drying (AWD). The results showed that the AWD and CFA treatments improved soil N transformation, rice growth, and N absorption and accumulation. Soil NO₃^– content, nitrification activity and ammonia-oxidising bacteria abundance, leaf area, nitrate reductase activity, and N absorption and accumulation in rice all increased in both cultivars. However, soil microbial biomass carbon and pH did not significantly change during the whole period of rice growth. Correlation analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance, and both of them significantly increased as the total N accumulation in rice increased. Our results indicated that improved soil O₂ conditions led to changing soil N cycling and contributed to increases in N absorption and accumulation by rice in paddy fields.

利用两个水稻品种（秀水09号和春优84号）评估了不同土壤氧（O ₂）条件对水稻植株中氮（N）转化，吸收和积累的影响。处理方法为连续驱油（CF），连续驱油和曝气（CFA）以及交替润湿和干燥（AWD）。结果表明，AWD和CFA处理改善了土壤氮素的转化，水稻的生长以及氮素的吸收和积累。土壤NO ₃ ^–两个品种的水稻中其含量，硝化活性和氨氧化细菌的丰度，叶面积，硝酸盐还原酶活性以及氮的吸收和积累均增加。然而，在整个水稻生长期间，土壤微生物生物量碳和pH值没有显着变化。相关分析表明，硝化活性与氨氧化细菌的丰度之间存在显着的正相关关系，并且随着水稻中总氮的积累，二者均显着增加。我们的结果表明，改良的土壤O ₂条件导致改变土壤氮循环，并促进水稻在稻田中对氮的吸收和积累。