【摘要】 根据对华东稻麦轮作周期的N2 O排放及其影响因子的连续观测结果 ,分析了N2 O排放时间变化以及施肥、灌溉、温度、土壤湿度和土壤速效N素含量对N2 O排放的影响 ,同时还比较分析了稻田N2 O和CH4排放 .研究结果表明 ,稻麦轮作周期内 ,水稻生长季的N2 O排放量仅占 30 % ,稻田持续淹水可比常规灌溉增加CH4排放量 2 6% ,减少N2 O排放量 1 1～ 2 6% .更多还原

【Abstract】 Based on the observations on N 2O emission from rice-wheat rotation systems in Southeast China,its temporal variation and the effects of fertilization,irrigation,temperature,and soil moisture and available N contents on it are discussed. Meanwhile,the difference of CH 4 and N 2O emissions from rice season is analysed. The results show that the amount of N 2O emitted from rice season only accounts for about 30% of the whole rotation cycle.The CH 4 emission increases 26% by keeping flooding in rice season,and N 2O emission from rice-wheat rotation cycle reduces 13～26%,comparing to normal irrigation.更多还原