חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Gas Diffusion as a Factor in Laboratory Incubation Studies on Denitrification
Year:
1979
Source of publication :
Journal of Environmental Quality
Authors :
הדס, אביבה
;
.
Volume :
9
Co-Authors:

Letey, J.; Jury, W.A.; Valoras, N.

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 calcualted 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 calculated 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.

Note:
Related Files :
DENITRIFICATION
nitrate
nitrogen transformation
nitrous oxide
soil
עוד תגיות
תוכן קשור
More details
DOI :
https://doi.org/10.2134/jeq1980.00472425000900020012x
Article number:
0
Affiliations:
Database:
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
51318
Last updated date:
02/03/2022 17:27
Creation date:
26/10/2020 15:24
Scientific Publication
Gas Diffusion as a Factor in Laboratory Incubation Studies on Denitrification
9

Letey, J.; Jury, W.A.; Valoras, N.

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 calcualted 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 calculated 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.

Scientific Publication
נגישות
menu      
You may also be interested in