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2024 Vol.57, Issue 3 Preview Page

Original research article

Increased N2O emissions from aerobic soil with warming is mainly attributable to increased mineralization of organic nitrogen: An incubation study
Min-Hyo Lim1
,
Kyeong-Su Choi1
,
Seok-In Yun2*
1Master Student, Department of Bio-Environmental Chemistry, Wonkwang University, Iksan 54538, Korea
2Professor, Department of Life and Environmental Sciences and Institute of Life Science and Natural Resources, Wonkwang University, Iksan 54538, Korea
*Corresponding Author
31 August 2024. pp. 164-174
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Abstract

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°C. 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°C than at 15°C, 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°C 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°C, 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.

Increased N2O emissions from aerobic soil with warming is attributable to increased mineralization of organic nitrogen and subsequent increased nitrification.
Keywords
Ammonia oxidation
Denitrification
Field capacity
Net nitrification rate
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 57
  • No :3
  • Pages :164-174
  • Received Date : 2024-07-23
  • Revised Date : 2024-08-12
  • Accepted Date : 2024-08-12
  • DOI :https://doi.org/10.7745/KJSSF.2024.57.3.164
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