Diurnal variability in rate of emission of nitrous oxide from soils

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Soil Sci. Soc. Am. J.; (United States)

DOI:https://doi.org/10.2136/sssaj1982.03615995004600050011x· OSTI ID:5603807

Blackmer, A M; Robbins, S G; Bremner, J M

Diurnal variability in the rate of emission of nitrous oxide (N/sub 2/O) from Iowa soils was studied by using a chamber technique to measure the N/sub 2/O emission rates at sites on fertilized and unfertilized soils at 1- or 2-h intervals for periods of from 1 to 5 d. The coefficients of variation for the rates of N/sub 2/O emission observed at these sites within 24-h periods ranged from 12 to 66% and averaged 38%. As much as 90% of the diurnal variability observed could be attributed to diurnal N/sub 2/O emission patterns related to changes in soil temperature. Observations reported suggest that these patterns were caused largely by changes in the solubility of N/sub 2/O in soil water induced by diurnal changes in soil temperature, that the amplitudes of these patterns were determined largely by the amounts of water and N/sub 2/O in the surface soil, that the times of minima and maxima in these patterns were determined by the depth at which temperature-induced changes in the solubility of N/sub 2/O in water were significant, and that neither the amplitudes nor the times of minima and maxima in these patterns can be predicted solely from soil temperature. Data reported show that there is no short time during a 24-h period that is always satisfactory for assessing the amount of N/sub 2/O evolved during that period.

• Research Organization: Iowa State Univ., Ames
• OSTI ID: 5603807
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 46:5; ISSN SSSJD
• Country of Publication: United States
• Language: English

Related Subjects

510200* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHALCOGENIDES
CHEMISTRY
DAILY VARIATIONS
ECOLOGICAL CONCENTRATION
FEDERAL REGION VII
IOWA
NITROGEN COMPOUNDS
NITROGEN FIXATION
NITROGEN OXIDES
NITROUS OXIDE
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
SOIL CHEMISTRY
SOILS
SOLUBILITY
TEMPERATURE DEPENDENCE
USA
VARIATIONS