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Gas diffusion as a factor in laboratory incubation studies on denitrification
Year:
1980
Source of publication :
Journal of Environmental Quality
Authors :
Hadas, Aviva
;
.
Volume :
9
Co-Authors:
Letey, J., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Jury, W.A., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Hadas, A., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Valoras, N., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Facilitators :
From page:
223
To page:
227
(
Total pages:
5
)
Abstract:
Lack of nitrogen balance has been frequently observed in laboratory incubation studies on denitrification. Equations were developed for nitrogeneous gas diffusion from incubated soil cores. Calculations using the developed equations indicate that only a fraction of the produced nitrogeneous gases in the soil core diffuses into the incubation container and is measured. The fraction diffusing from the soil core increases as the soil air-filled porosity increases and the adsorption coefficient between the gas and soil decreases. Under saturated soil conditions, only about 30% of the produced N2O is calculated to be evolved even if adsorption is zero for soil cores 2.5 cm deep. Furthermore, several days are required for produced N2O to evolve from the core after production ceases under saturated conditions. Similar results are calculated for N2. Thus, nitrogen deficits can be explained by diffusion analysis which eliminates the need for a postulated unknown intermediate compound. In a comparison between calcuated and measured N2O evolution, 34% evolution was calculated and 24% was observed for the experimental conditions. The assumptions used in developing the equations lead to a slight overprediction of evolved gases.Equations were developed for nitrogeneous gas diffusion from incubated soil cores. Calculations using the developed equations indicate that only a fraction of the produced nitrogeneous gases in the soil core diffuses into the incubation container and is measured. The fraction diffusing from the soil core increases as the soil air-filled porosity increases and the adsorption coefficient between the gas and soil decreases. Under saturated soil conditions, only about 30% of the produced N//2O is calculated to be evolved even if adsorption is zero for soil cores 2. 5 cm deep. Nitrogen deficits can be explained by diffusion analysis which eliminates the need for a postulated unknown intermediate compound. The assumptions used in developing the equations lead to a slight overprediction of evolved gases.
Note:
Related Files :
DENITRIFICATION
NITROGEN - Diffusion
nitrous oxide
soil bacterium
Soils
theoretical study
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
Language:
English
Editors' remarks:
ID:
29571
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
Scientific Publication
Gas diffusion as a factor in laboratory incubation studies on denitrification
9
Letey, J., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Jury, W.A., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Hadas, A., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Valoras, N., Dept. Soil Environ. Sci., Univ. California, Riverside, Calif. 92521, United States
Gas diffusion as a factor in laboratory incubation studies on denitrification
Lack of nitrogen balance has been frequently observed in laboratory incubation studies on denitrification. Equations were developed for nitrogeneous gas diffusion from incubated soil cores. Calculations using the developed equations indicate that only a fraction of the produced nitrogeneous gases in the soil core diffuses into the incubation container and is measured. The fraction diffusing from the soil core increases as the soil air-filled porosity increases and the adsorption coefficient between the gas and soil decreases. Under saturated soil conditions, only about 30% of the produced N2O is calculated to be evolved even if adsorption is zero for soil cores 2.5 cm deep. Furthermore, several days are required for produced N2O to evolve from the core after production ceases under saturated conditions. Similar results are calculated for N2. Thus, nitrogen deficits can be explained by diffusion analysis which eliminates the need for a postulated unknown intermediate compound. In a comparison between calcuated and measured N2O evolution, 34% evolution was calculated and 24% was observed for the experimental conditions. The assumptions used in developing the equations lead to a slight overprediction of evolved gases.Equations were developed for nitrogeneous gas diffusion from incubated soil cores. Calculations using the developed equations indicate that only a fraction of the produced nitrogeneous gases in the soil core diffuses into the incubation container and is measured. The fraction diffusing from the soil core increases as the soil air-filled porosity increases and the adsorption coefficient between the gas and soil decreases. Under saturated soil conditions, only about 30% of the produced N//2O is calculated to be evolved even if adsorption is zero for soil cores 2. 5 cm deep. Nitrogen deficits can be explained by diffusion analysis which eliminates the need for a postulated unknown intermediate compound. The assumptions used in developing the equations lead to a slight overprediction of evolved gases.
Scientific Publication
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