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通过田间原位测定农田氨挥发的方法,研究了京郊不同基施氮肥水平的麦田冬前土壤氨挥发情况及其时间变化规律。结果表明,麦田土壤氨挥发主要发生在施肥后1~2周内,以施肥后连续采样14 d的氨挥发累积量作为小麦冬前氨挥发总排放量,高施氮量处理的氨挥发总量大于低施氮量处理的氨挥发总量,50~400 kg·hm-2不同施肥水平下土壤的氨挥发总量(N)为1.83~14.29 kg·hm-2,占施氮量的2.04%~6.74%。温度回升也导致了氨挥发量小范围升高。
Ammonia volatilization in farmland was determined in situ by field experiments to study soil ammonia volatilization and its temporal variation before winter wheat fields with different nitrogen levels. The results showed that ammonia volatilization in wheat field occurred within 1 ~ 2 weeks after fertilization. The amount of ammonia volatilization accumulated continuously for 14 days after fertilization was used as the total ammonia volatilization before winter wheat and the total amount of ammonia volatilization The total amount of ammonia volatilization (N) was 1.83 ~ 14.29 kg · hm-2 under different fertilization levels, accounting for 2.04% of the total N application. ~ 6.74%. Temperature rise also led to a small range of ammonia volatilization.