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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.8
- 수록면
- 164 - 174 (11page)
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초록· 키워드
Nitrous oxide (N₂O) can be produced via microbial oxidation of ammonia (nitrification) in the aerobic soil. Warming, a factor influencing microbial activity, can increase the rates of ammonia oxidation and N₂O emissions. However, the amount of ammonia, a substrate of nitrification process, is a critical factor in determining the cumulative N₂O emissions from agricultural fields receiving nitrogen (N) fertilizer. To investigate the effects of increasing temperature on temporal variation and cumulative amount of N₂O emissions in aerobic soil, we conducted an incubation experiment with soil treated with ammonium sulfate at 15 and 25℃. To maintain soil aeration, the soil water content during the incubation period was adjusted to the field capacity, and the concentrations of inorganic soil N (NH₄⁺-N and NO₃⁻-N) and N₂O emissions were periodically measured. During the incubation period, the sum of inorganic soil N increased due to the mineralization of organic N. The net increase in NO₃⁻ concentration, a product of ammonia oxidation, was 6% higher at 25℃ than at 15℃, reflecting the increase in nitrification process following the increased mineralization of organic N. Nitrous oxide was mainly emitted during periods when sufficient NH₄⁺ was present in soil, reflecting that ammonia oxidation was the main process of N₂O production. Accumulated N₂O emissions were 10% higher at 25℃ than at 15°C, but the difference was statistically insignificant (P ＞ 0.05). Despite the small and insignificant difference in accumulated N₂O emissions between 15 and 25℃, 60% of the difference is attributable to the increase in the nitrification reaction. The results of this study suggest that N₂O emissions may increase due to increased temperature in soil fertilized with N, but this increase is mainly attributable to increased mineralization of organic N and subsequent increased nitrification.
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목차
- ABSTRACT
- Introduction
- Materials and Methods
- Results and Discussion
- Conclusions
- References
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UCI(KEPA) : I410-151-25-02-091102072
