氮肥与硝化抑制剂联用对热带菜地氧化亚氮排放的影响

以热带地区种植辣椒为研究对象，采用静态箱–气相色谱法，监测施用不同形态氮以及硝化抑制剂双氰胺(DCD)对菜地N₂O排放和辣椒产量的影响。结果表明，菜地N₂O排放通量变化范围为1.51～80.53μg·m^-2·h^-1，铵态氮肥(NH₄)处理土壤N₂O排放通量显著高于硝态氮肥(NO₃)处理，NH₄处理N₂O排放最大峰值达80.53μg·m^-2·h^-1,NO₃处理N₂O最大峰值同比NH₄处理降低了21.2%。与氮肥处理相比，配施DCD均显著降低了N₂O累计排放量(P<0.05)，分别降低为59%和49%，而铵态氮肥+双氰胺(NH₄+D)处理和硝态氮肥+双氰胺(NO₃+D)处理对N₂O累计排放量差异...

Effects of nitrogen fertilizer combined with nitrification inhibitor on nitrous oxide emissions from tropical vegetable Fields

Chili peppers were applied with nitrogen fertilizer combined with nitrification inhibitors to analyze nitrous oxide (N₂O) emissions from chili pepper fields in Hainan, the tropical area in China, by static box-gas chromatography method. The results showed that the variation of N₂O emission flux from the chili pepper fields ranged from 1.51 to 80.53 μg·m?2·h?1. The soil N₂O emission flux was higher in the NH₄ treatment than in the NO₃ treatment. The maximum peak value of N₂O emission in the NH₄ treatment was 80.53 μg·m?1 m?2·h?1, and the Compared with the single treatment with nitrogen fertilizer, both the NH₄ and the NO₃ combined with dicyandiamide (DCD) treatment significantly reduced the cumulative N₂O emissions by 59% and 49%, respectively, and their effects on the cumulative N₂O emissions were not significantly different. The chili pepper in the NH₄ treatment and the NO₃ treatment yielded 18.06 and 11.41 tons/ha, respectively, with the yield in the former treatment increasing by 58.28%, indicating a significant difference in yield between the two treatments. After applying with DCD, there was no significant difference of peper yield between the NH₄+DCD and the NO₃+DCD treatments. Together, these results indicated that the application of ammonium nitrogen fertilizer combined with DCD can significantly reduce N₂O emissions from the vegetable fields while maintaining high peper yield.