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- W3150702966 abstract "Nitrification is a major source of N2O.However,there is little information on how environmental and soil variables affect N2O emission during nitrification.A fixed fraction rate is often used to estimate N2O emission from soil induced by nitrification in most available models.To that end,an incubation experiment was conducted to investigate the effect of soil moisture,temperature and NH 4+-N concentration on nitrification and nitrification-induced N2O emission in acidic sandy-loam soils in southeastern Australia.The Michaelis-Menten equation was used to express nitrification dynamics while the Least Square method was used to derive the maximum velocity of nitrification and N2O fraction of nitrification.A series of algorisms were proposed to describe the relationships between nitrification velocity/N2O production and the driving factors of NH 4+-N concentration,soil moisture and temperature.Results show exponentially enhanced nitrification velocity with increasing soil temperature.Nitrification velocity increases when soil water-filled porosity (WFPS) increases from 20% to 40%,reaches its peak at around 40%,and then declines at 60% WFPS.NH 4+-N concentration is negatively correlated with nitrification velocity.By fitting with Least Square,a maximum reaction velocity (V max) is achieved at 6.67 mg·kg-1 ·d-1 for the sandy-loam soil.N2O emission fraction of nitrification declines with increasing incubation temperature.Soil NH 4+-N concentration is slightly positively correlated with soil nitrification emitted N2O.Under 20% and 40% WFPS,measured N2O emission fraction of nitrification range is 0.43%～1.50%,with a maximum fraction of 3.03% obtained by fitting Least Square.However,this method cannot reliably assess the impact of soil WFPS on N2O emission fraction of nitrification.,Bbecause N2O emission increases exponentially when WFPS increases to 60%,indicating that soil denitrification might occur at 60% WFPS." @default.
- W3150702966 created "2021-04-13" @default.
- W3150702966 creator A5074011678 @default.
- W3150702966 date "2010-01-01" @default.
- W3150702966 modified "2023-09-25" @default.
- W3150702966 title "Effect of soil temperature,moisture and NH 4_+~-N concentration on nitrification and nitrification-induced N_2O emission" @default.
- W3150702966 hasPublicationYear "2010" @default.
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