Influence of soil organic matter and reduced rainfall on nitrous oxide emissions along a cultivated hillslope

Soil organic matter (SOM) consists of carbon and nitrogen, both of which can contribute to the production of nitrous oxide (N2O). Currently, there is ample focus on increasing soil carbon content as a strategy for climate mitigation. Yet, the role of SOM on N2O production is poorly understood. We will present field flux N2O measurements from a hillslope cultivated to cereals with a natural gradient in SOM, pH and soil moisture. Additionally, eight rain exclusion shelters (~50% drought) were installed along the gradient, and N2O fluxes were measured both under 50% reduced and normal rainfall conditions. N2O fluxes have been measured for two growing seasons and will be presented alongside with soil and yield characteristics.