关键词: 集约化稻作, 保护性耕作, 等氮替代, N2O排放, 水稻产量

Abstract: It was set up conventional no-tillage and smash ridging no-tillage in this experiment.In conventional no-tillage rice field was set green manure combined application chemical fertilizer(C3) and silkworm-excrement organic fertilizer combined application chemical fertilizer（C4）, synchronously set blank contrast（C1）and conventional contrast of total fertilization(C2). And smash ridging no-tillage was set green manure combined application chemical fertilizer(F3) and silkworm-excrement organic fertilizer combined application chemical fertilizer（F4), synchronously set blank contrast（F1）and conventional contrast of total fertilization(F2). The results showed that: (1)in this experiment,organic fertilizer combined with chemical fertilizer significantly reduced the cumulative N₂O emission.The cumulative N₂O emission of organic fertilizer combined with chemical fertilizer(C3,C4,F3,F4) compared with fertilizer contrast(C2) respectively decreased 69.1%, 86.3%, 69.9% and 63.4% in early rice season,and decreased 7.3%, 67.2%, 38.5% and 60.4% in the late rice season. (2)Green manure combined with chemical fertilizer applied to rice field can keep rice yield stable in Smash ridging no-tillage. In Smash ridging no-tillage，the yield of F3 compared with F2 increased by 0.6%−10.0%,and the yield of F4 compared with F2 decreased by 1.7%−6.6%. In conventional no-tillage, the yield of C3 and C4 compared with C2 decreased by 1.0%−1.1% and 1.1%−8.4%.（3）Organic fertilizers combine with chemical fertilizers applied to rice fields can affect the growth of rice roots，it significantly improve the dry-matter of plant and the number of effective panicles and grains per panicle. The dry-matter of plant accumulation of F3 and C3 compared with F2 and C2, it increased 22.6% and 5.4% in the early and late rice season. The number of effective panicles and grains per panicle was increasing by 6.3%−13.5% and 0.3%−6.2% in this experiment. In no-tillage rice field use of organic resources instead of chemical fertilizers into the rice fields can effectively reduce N₂O emission. Green manure combined with chemical fertilizer applied to rice field can improved root quality of rice，increase rice dry matter ，and it can reduced N₂O emission while kept the rice yield. It can be used as a sustainable production regulation technology for intensive rice farming.

Key words: Intensive rice farming, Conservation tillage, Equal nitrogen replacement, N2O emissions, Rice yield