von der Heide, Carolin:
ISBN 9783899598452

The N2O dynamics in the groundwater of a catchment in northern Germany and its significance for indirect N2O emissions. HORIZONTE - Herrenhäuser Forschungsbeiträge zur Bodenkunde Band 23 # Pb., 134 S., 29 Abb., davon 1 in Farbe, 14 Tab.

SCHLAGWORTE:
Grundwasser
Klimagas Distickstoffoxid
Distickstoffoxid Emissionen, indirekte
Variabilität, räumliche, von Distickstoffoxid Emissionen
Variabilität, zeitliche, von Distickstoffoxid Emissionen

The objectives of this study were the identification of the factors and processes that result in the accumulation of N2O in the surface groundwater, the investigation of the spatial and temporal dynamics of N2O concentrations in the surface groundwater and the assessment of indirect N2O emissions from the groundwater. The study area was the sandy Fuhrberger Feld Aquifer (FFA) in northern Germany and the in situ sampling campaigns were conducted from March 2005 to April 2007.
The results showed that heterotrophic denitrification was the main process for N2O accumulation in the surface groundwater; significant factors were NO3-, O2, CO2, DOC, the Eh-pH state and the content of Corg. The largest part of the spatial variance of N2O was located on the small transect scale and the temporal variability was considerable with higher N2O concentrations in the vegetation period. The analysis of the vertical and the lateral N2O emission pathway showed that the FFA was not a significant source for indirect N2O emissions, indicating that the revised emission factor for groundwater (EF5-g) of 0.0025 kg N2O-N per kg of N leached might still overestimate indirect emissions from reducing aquifers like the FFA.

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