| 阎佩云,刘建亮,沈玉芳,李世清.黄土旱塬旱作覆膜春玉米农田N2O排放通量及影响因素研究[J].农业环境科学学报,2013,32(11):2278-2285. |
| 黄土旱塬旱作覆膜春玉米农田N2O排放通量及影响因素研究 |
| Nitrous Oxide Emissions and Its Influencing Factors in Spring Corn Fields Mulched with Plastic Film on the Loess Plateau |
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| DOI：10.11654/jaes.2013.11.025 |
| 中文关键词: 氧化亚氮 旱作玉米 氮肥 覆膜 影响因素 |
| 英文关键词: nitrous oxide dryland corn nitrogen fertilizer plastic film mulching influencing factors |
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| 摘要点击次数: 2717 |
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| 中文摘要: |
| 采用密闭式静态箱法研究黄土高原旱作玉米不同栽培模式下氧化亚氮（N2O）的排放通量及主要影响因素。结果表明，施氮是影响N2O排放的主要因素，高氮处理>中氮+有机肥处理>不施氮肥处理，且排放高峰出现在施肥后的4~10 d，施氮处理N2O排放通量呈季节动态变化，共出现3次排放高峰，均出现在施氮及降雨后。等量施肥条件下，覆膜处理并没有显著影响N2O排放量，N2O排放通量与硝态氮含量呈极显著正相关 （P<0.01）。在黄土高原旱作玉米农田，土壤硝化过程是导致N2O排放的主要因素，反硝化作用对N2O排放的贡献相对较低。 |
| 英文摘要: |
| The static gas chamber technique was used to investigate nitrous oxide（N2O） emission fluxes and its main influencing factors in a spring corn field under different cultivation methods on the Loess Plateau, Northwestern China. The experiment treatments included two plastic film mulch（no mulch, T1 and mulch, T2） under the same fertilization and three fertilization（high inorganic nitrogen, T3; inorganic nitrogen+organic fertilizer, T4; and no fertilizer, T5） under the same mulch conditions. Results showed that nitrogen application was the main factor affecting the N2O emissions, where T3>T4>T5. The peak emissions occurred 4~10 d after fertilization. In nitrogen treatments, N2O fluxes showed three emission peaks in the season, all occurring after nitrogen application and rainfall. Film mulching did not significantly affect N2O emissions. The N2O emission fluxes were significantly positively correlated with soil NO-3（P<0.01）. In the dryland corn field on the Loess Plateau, soil nitrification was a main contributor to N2O emissions but denitrification played a relatively small role in the N2O emissions. |
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