Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/S1465-9972(00)00012-X |
| Title (Primary) | The formation fo the trace gases NO and N2O in soils by the coupled processes of nitrification and denitrification: results of kinetic 15N tracer investigations |
| Author | Russow, R.; Sich, I.; Neue, H.-U. |
| Source Titel | Chemosphere - Global Change Science |
| Year | 2000 |
| Department | BOPHY; BOCHE; BOFO |
| Volume | 2 |
| Issue | 3-4 |
| Page From | 359 |
| Page To | 366 |
| Language | englisch |
| Keywords | Denitrification; Model; Nitrogen 15; Nitrification; Nitric oxide; Nitrous oxide; Soil |
| Abstract | Biogenic production in soils, especially when fertilized with high levels of nitrogen, is one of the main sources of nitrous oxide (N2O) and may be a significant source of nitric oxide (NO). NO and N2O are formed by the microbial processes of nitrification and denitrification but in soils these processes are not fully understood in detail. The kinetic 15N isotope method, is very useful for investigating the mechanism of such complex N transformation processes in soils. We used this method with 15NH4+, 15NO2-, and 15NO3- as tracers to study the processes of NO and N2O formation in black earth soil (Haplic Phaeozem). The experiments were conducted using a special analytical set-up in which the incubation vessels were directly connected to a gas chromatograph quadrupole mass spectrometer system. This system allows simultaneous determination of the concentration of N2O, NO and N2 along with their 15N abundance in the gas phase. The results of these investigations are discussed and combined in a diagram, termed the model of coupled nitrification and denitrification, illustrating the formation of NO and N2O. Nitrification and denitrification proceed under both water-unsaturated (nearly aerobic) and water-saturated (nearly anaerobic) conditions. The two processes are linked by a ''common'' nitrate pool. In contrast the nitrite, an important intermediate of the two processes, evidently exists within two separate pools. NO is mainly produced by nitrification as a by-product of the oxidation of ammonium to nitrite or directly by nitrite decomposition. If NH4+ contents are high under aerobic conditions NO emission can markedly exceed that of N2O. Nitrous oxide is mainly formed by denitrification of nitrate. Therefore increasing water saturation promotes N2O emission. NO could not be confirmed as a free precursor of N2O formation via denitrification. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=7595 |
| Russow, R., Sich, I., Neue, H.-U. (2000): The formation fo the trace gases NO and N2O in soils by the coupled processes of nitrification and denitrification: results of kinetic 15N tracer investigations Chemosphere - Global Change Science 2 (3-4), 359 - 366 10.1016/S1465-9972(00)00012-X |
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