施氮水平对不同株型水稻品种N_2O排放通量的影响

Effect on N_2O Flux of Different Plant Type Rice under Several Nitrogen Levels

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N_2O排放通量。结果表明,不同株型品种间N_2O排放通量差异显著,紧凑型沈农07425的N_2O排放通量远小于松散型秋光。不同株型品种N_2O排放通量随施氮量的变化存在差异。沈农07425的N_2O排放通量随着施氮量提高而增加,高氮处理下N_2O排放通量最大,秋光的N_2O排放通量则在中氮处理下达到最大值。

The compact rice Shennong-07425 with erect panicle and the loose rice Akihikari with curved panicle were used to study the differences on N_2O Flux under several nitrogen levels in pot experiment. The main results are as follows. There is significant difference on N_2O Flux between the tow varieties. The nitrification-denitrification gas loss in Shennong—07425 is far less than that of Akihikari. N_2O Flux of different plant species changes with different nitrogen levels, the N_2O 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.