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采用室内恒温模拟培养方法,以单施尿素处理为对照,研究了减量尿素配施玉米秸秆、配施脲酶抑制剂NBPT和硝化抑制剂DMPP组合、配施玉米秸秆+抑制剂组合等处理对棕壤氨挥发特性的影响,分析了不同处理土壤的p H、铵态氮、硝态氮含量与氨挥发速率的相关性。结果表明:单施尿素处理氨挥发速率在第3天即达到峰值;减量尿素配施玉米秸秆处理的氨挥发速率峰值出现时间延迟至施肥后第5天;在配施玉米秸秆的土壤中添加抑制剂组合后,氨挥发速率峰值延迟至第11天出现。与单施尿素相比,减量尿素配施玉米秸秆并添加抑制剂组合可显著降低氨挥发速率峰值74.27%,培养18 d可减少氨挥发累积损失量43.96%。不同处理的氨挥发速率与土壤的铵态氮浓度、p H呈正相关,与土壤的硝态氮浓度呈负相关。配施玉米秸秆并添加抑制剂组合的土壤中铵态氮浓度达到高峰后可长时间保持较高水平(>350 mg·kg-1),并可有效减少硝态氮的浓度。
In this study, indoor urea incubation was used as a control to study the effect of reducing urea on corn stover, combining NBPT with nitrification inhibitor DMPP, applying corn stalk + inhibitor combination to brown Soil ammonia volatilization characteristics of the analysis of different treatment soil p H, ammonium nitrogen, nitrate nitrogen content and ammonia volatilization rate correlation. The results showed that the ammonia volatilization rate reached the peak value on the third day with single application of urea, and the peak time of ammonia volatilization rate was decreased to the fifth day after fertilization with reduced urea and corn stover. In the soil supplemented with corn stover, Ammonia volatilization peaked late until day 11 after combination of inhibitors. Compared with single application of urea, urea reduction with corn stalk and inhibitor addition significantly reduced ammonia volatilization rate by 74.27%, and decreased ammonia volatilization by 43.96% after 18 days. The ammonia volatilization rate of different treatments was positively correlated with soil ammonium nitrogen concentration, p H and negatively correlated with soil nitrate nitrogen concentration. The concentration of ammonium nitrogen in the soil with the combination of corn stalk and inhibitor added can maintain a high level (> 350 mg · kg-1) for a long time and can effectively reduce the concentration of nitrate nitrogen.