施肥管理改变对红壤性水稻土氧化亚氮排放的影响

Effect of Fertilization Changing on Nitrous Oxide Flux in Paddy Soil from Red Soi

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N2O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N2O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N2O排放的全球增温潜势估算分别降低了8.2%和4.1%。

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 N20 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 N20 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,respectivcly.