| 易琼,唐拴虎,逄玉万,黄旭,黄巧义,李苹,付弘婷,杨少海.华南稻区不同施肥模式下土壤CH4和N2O排放特征[J].农业环境科学学报,2014,33(12):2478-2484. |
| 华南稻区不同施肥模式下土壤CH4和N2O排放特征 |
| Emissions of CH4 and N2O from Paddy Soil in South China Under Different Fertilization Patterns |
| 投稿时间：2014-07-23 |
| DOI：10.11654/jaes.2014.12.028 |
| 中文关键词: 施肥模式 华南 双季稻 甲烷 氧化亚氮 |
| 英文关键词: fertilization patterns South China double rice cropping methane nitrous oxide |
| 基金项目:广东省科技计划项目(2011A030600001);广东省科技计划项目(2012A020100004) |
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| 中文摘要: |
| 通过田间试验研究了不同施肥模式对华南稻田CH4和N2O排放的影响.研究结果表明:水稻生育期内,CH4排放呈单峰曲线,不同水稻季CH4排放峰出现的时间和峰值不同,晚稻CH4排放峰出现的时间早于早稻,且峰值明显高于早稻.由三季水稻观测数据可知:稻田CH4排放通量范围分别为-0.29~14.83、-6.09~31.54、-0.11~22.87 mg·m-2·h-1,而不同生长季N2O排放数据表明稻田N2O排放通量非常小且N2O排放规律不明显;稳定性氮肥结合甲烷抑制剂(SN)处理CH4季节排放总量最低,与农民习惯施肥处理(FP)相比,SN处理均能明显降低CH4季节排放量,降幅分别达34.1%、28.4%和7.7%.分析单位产量CH4和N2O增温潜势可知,两季水稻SN处理较FP处理全球增温潜势分别降低了31.0%和17.8%.综上认为,华南稻-稻连作种植体系下,CH4气体是稻田全球增温潜势增加的主要温室气体,SN施肥模式可作为该区域稻田温室气体减排的一项重要措施. |
| 英文摘要: |
| A field experiment was conducted to study the effects of different fertilization patterns on CH4 and N2O emissions from paddy soil. Methane emissions displayed a single peak curve during rice growing period. The emission peak occurred earlier for late rice than for early rice variety, and the peak value was higher in the former than in the latter. The emitted CH4 ranged from -0.29~14.83 mg·m-2·h-1, -6.09~31.54 mg·m-2·h-1, -0.11~22.87 mg·m-2·h-1 for early and late rice in 2012 and early rice in 2013, respectively. The N2O fluxes in paddy soil were quite low and varied little among different rice seasons. Compared with farmers' practice(FP), the treatment with stabilized nitrogen fertilizer combined with methane inhibitor(SN) showed the lowest seasonal total CH4 emission, and effectively reduced seasonal CH4 emission fluxes by 34.1%, 28.4% and 7.7% in early and late rice in 2012 and early rice in 2013, respectively. The partial global warming potential(pGWP) per unit output showed that SN treatment reduced the pGWP by 31.0% and 17.8% for CH4 and N2O, respectively, in comparison with FP. In conclusion, CH4 was the most important greenhouse gas in rice cropping system in South China Region, and SN could serve as an effective measure to reduce greenhouse gas emissions. |
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