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Serca et al. 1994. Emissions of nitrogen oxides from equatorial rain forest in central Africa

Serca, D., Delmas, R., Jambert, C., Labroue, L., 1994. Emissions of nitrogen oxides from equatorial rain forest in central Africa. Tellus B 46, 243-254. doi:10.1034/j.1600-0889.1994.t01-3-00001.x.


Abstract

Emissions of nitric oxide from soils of equatorial rain forest were measured in the Dimonika Natural Park (4°30′S, 12°30′E) in the Mayombe Forest in Congo. Three research campaigns were carried out in June and July 1991 and in February 1992. Fluxes were measured by dynamic chamber techniques using a chemiluminescence instrument Scintrex LMA3. NO fluxes measured on natural soils are in between 5 and 17 × 109 molecules cm−2 s−1; they are of the same order of magnitude as those observed in similar tropical forest media. Soil treatment experiments show that the auto-decomposition of HNO2 in these acid soils (pH# 4) (chemodenitrification) is a potentially important cause of nitric oxide production in this type of ecosystem. Nitrous acid comes from autotrophic nitrification all the year round, and also from biological denitrification, shown by N20 emissions, during the rainy season. The regulation of NO release from soils is linked to ammonia production from litter mineralisation and to direct NH4 input by throughfall.

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