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4～10d，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NzO排放量，N：O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。
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 plas- tic film mulch（no mulch, T1 and mulch, T2） under the same fertilization and three fertilization（high inorganic nitrogen, T3; inorganic nitro- gen＋organic fertilizer, T4; and no fertilizer, T5 ） under the same mulch conditions. Results showed that nitrogen application was the main fac- tor affecting the N2O emissions, where T3〉T4〉T5. The peak emissions occurred 4~10 d after fertilization. In nitrogen treatments, N2Ofluxes 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;（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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第11期2278-2285,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金(31270553)
陕西省自然科学基金(2012JM3010)
甘肃省农业科学院农业科技创新专项(2012GAAS15-22-4)
关键词
氧化亚氮
旱作玉米
氮肥
覆膜
影响因素
nitrous oxide
dryland corn
nitrogen fertilizer
plastic film mulching
influencing factors
