Seven treatments were set based a 30-year fertilization experiment in paddy soil,the original high organic mate-rial treatment ( HOM),the high organic material treatment reformed from the original normal organic material treatment ( N-H),the original normal organic material treatment ( NOM),the normal organic material treatment reformed from the o-riginal chemical fertilizer treatment ( C-N),the chemical fertilizer treatment reformed from the original high organic mate-rial treatment ( H-C) and the chemical fertilizer treatment reformed from the original normal organic material treatment ( N-C),the original chemical fertilizer treatment ( CF),and the N2 O flux from the original and changed treatments during double rice cropping rotation cycle in 2013-2014 was measured.The results showed that:global warming potential esti-mates of annual N2 O emissions in the N-C and H-C was increased by 7.9％and 4.7％compared with NOM and HOM,respectively,while that in the N-H and C-N was decreased by 8.2％and 4.1％compared with NOM and CF,re-spectively.%利用一个长达30年的水稻土长期定位试验,在保证原有定位试验继续正常开展的前提下变更部分施肥处理,得到继续施用高量有机肥( HOM)、施用常量有机肥30年后改施高量有机肥( N-H)、继续施用常量有机肥( NOM)、施用化肥30年后改施常量有机肥( C-N)、施用高量有机肥30年后改施化肥( H-C)、施用常量有机肥30年后改施化肥( N-C)、继续施用化肥( CF)等7种施肥处理,观测2013～2014年双季稻轮作周期内原有施肥和变更施肥处理后对土体N2 O排放的影响.结果表明:NOM改为N-C和HOM改为H-C处理,与变更前相比,周年N2 O排放的全球增温潜势估算分别提高了7.9％和4.7％,而NOM改为N-H和CF改为C-N处理,周年N2 O排放的全球增温潜势估算分别降低了8.2％和4.1％.
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