EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Combining low-N2 background and 15N soil gas flux - lessons from the field

Amanda Matson1, Dirk Lempio1, Frank Höppner2, and Reinhard Well1
Amanda Matson et al.
  • 1Thünen-Institut für Agrarklimaschutz, Braunschweig, Germany
  • 2Julius Kühn-Institut für Pflanzenbau und Bodenkunde, Braunschweig, Germany

Accurate models of soil N cycling are an important tool for optimizing N use efficiency within agricultural systems and predicting N emissions to the environment. However, due to the methodological limitations for the measurement of N2 emissions, in particular high atmospheric N2, only a very limited number of soil N2 flux datasets are available to validate model estimates of denitrification. As part of the DFG-research unit “Denitrification in Agricultural Soils: Integrated Control and Modelling at Various Scales (DASIM)”, we are building on existing methods to take in situ measurements of denitrification under a variety of field conditions, with an emphasis on the detection of non-peak events. Using static chambers, we establish a low-N2 background through headspace and soil flushing, and then use stable isotope techniques (natural abundance and 15N labeling of the soil mineral N pool) to assess the response of soil denitrification to combinations of climate, soil and plant factors found in the field. Here we present results of N2 and N2O fluxes from the field, which highlight both the potential and the challenges of using this combined method.  

How to cite: Matson, A., Lempio, D., Höppner, F., and Well, R.: Combining low-N2 background and 15N soil gas flux - lessons from the field, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-13033,, 2022.