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Field measurements of NO and NO2 emissions from fertilized and unfertilized soils by F. Slemr; W. Seiler is a Earth and Planetary Sciences article available to read on EtoBox.

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Field measurements of NO and NO 2 emissions from soils have been performed in Finthen near Mainz (F.R.G.) and in Utrera near Seville (Spain). The applied method employed a flow box coupled with a chemiluminescent NO x detector allowing the determination of minimum flux rates of 2 ~tg N m -2 h -1 for NO and 3/~g m -2 h -1 for NO 2 . The NO and NO 2 flux rates were found to be strongly dependent on soil surface temperatures and showed strong daily variations with maximum values during the early afternoon and minimum values during the early morning. Between the daily variation patterns of NO and NO2, there was a time lag of about 2 h which seem to be due to the different physico-chemical properties of NO and NO 2. The apparent activation energy of NO emission calculated from the Arrhenius equation ranged between 44 and 103 kJ per mole. The NO and NO 2 emission rates were positively correlated with soil moisture in the upper soil layer. The measurements carried out in August in Finthen clearly indicate the establishment of NO and NO 2 equilibrium mixing ratios which appeared to be on the order of 20 ppbv for NO and 10 ppbv for NO~. The soil acted as a net sink for ambient air NO and NO

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Author

F. Slemr; W. Seiler

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0167-7764)

Published

1984

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)