The compact rice Shennong-07425 with erect panicle and the loose rice Akihikari with curved panicle were used to study the differences on N2O Flux under several nitrogen levels in pot experiment. The main results are as follows. There is significant difference on N2O Flux between the tow varieties. The nitrification-denitrification gas loss in Shennong—07425 is far less than that of Akihikari. N2O Flux of different plant species changes with different nitrogen levels, the N2O Flux in Shennong—07425 increases with increasing nitrogen application, and it reaches the maximum under high nitrogen treatment. But Akihikari attains its maximum under middle nitrogen treatment.%以穗型直立的紧凑型水稻品种沈农07425和穗型弯曲的松散型水稻品种秋光为材料,在不同施氮水平下研究两种株型水稻品种的N2O排放通量.结果表明,不同株型品种间N2O排放通量差异显著,紧凑型沈农07425的N2O排放通量远小于松散型秋光. 不同株型品种N2O排放通量随施氮量的变化存在差异. 沈农07425的N2O排放通量随着施氮量提高而增加,高氮处理下N2O排放通量最大,秋光的N2O排放通量则在中氮处理下达到最大值.
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