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Sanhueza et al. 1990
Sanhueza, E., Scharffe, D., Donoso, L. and Crutzen, P.J. (1990). N2O and NO emissions from soils of the Northern Part of the Guayana Shield, Venezuela. Journal of Geophysical Research 95: doi: 10.1029/90JD01652. issn: 0148-0227.

Soil fluxes of N2O and No were measured in a scrub grass savanna and a nearby semideciduous forest in the savanna climatic region of Venezuela, during October 1988. The forest soil produces significantly larger emissions of N2O (ranging from 5.7 to 25.0¿109 molecules cm-2 s-1) than the savanna soil (-3.6 to 14.0¿109 molecules cm-2 s-1). This suggests that ''long term'' deforestation could produce a reduction of the N2O emissions to the atmosphere. In comparison with previous results from another site in the Venezuelan savanna region, very low emissions of NO, of the order of 1 to 2¿109 molecules cm-2 s-1, were recorded. Considering that the NO/N2O emission ratio was much lower than 1, that practically no changes in the emission were observed after the fertilization with NH4Cl, and that very low concentration of NO-3 is found in the natural soil, it is likely that under undisturbed conditions N2O and NO are mainly produced by denitrification and that there is a lack of nitrifying bacteria in these soils. Both N2O and NO emissions increased after application of NaNO3. Since the emission of NO remained larger than the N2O emission (with a ratio of ~4/1), a significant change in the production pattern must have occurred after fertilization with nitrate. ¿ American Geophysical Union 1990

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Keywords
Atmospheric Composition and Structure, Biosphere/atmosphere interactions
Journal
Journal of Geophysical Research
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American Geophysical Union
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