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High-resolution Simulation of Denitrification (DASIM)
Project
Project code: keine Angabe
Contract period: 01.06.2016
- 31.05.2019
Purpose of research: Basic research
Denitrification in aerobic soils is considered to occur in anoxic microsites, which are heterogeneously distributed. Local anaerobic conditions can be the result of limited oxygen supply or high oxygen consumption due to the metabolism of easily degradable carbon. Thus, the dynamics of N transformations is governed by an interplay of microbial activity and abiotic conditions, which are related to soil structure. Denitrification is an inherently multi-scale process, where the bio-geochemical processes occur in individual pores while the relevant scale for the transport of oxygen and organic carbon is millimetres to decimeters. Product gas fluxes e.g. of nitrous oxide are needed for areas of square kilometeres and more. The gap between these at least three different scales, covering more than 9 orders of magnitude, will be closed by modelling and numerical simulation using a hierarchy of three models. A three-dimensional pore-scale model to simulate individual aggregates, a three-dimensional continuum-scale model to simulate experiments in soil mesocosms and a one-dimensional model to test upscaling concepts to be used in simulations for whole landscapes. The models will be parameterised with batch experiments and validated by their capability to predict the temporal dynamics of denitrification and its product ratio in experiments under varying conditions and with different materials from artificial aggregated porous media to undisturbed soil. The model hierarchy will then be applied to derive improved effective model descriptions of denitrification on the macroscale, especially the formation, extent and effect of anaerobic microzones.
Section overview
Subjects
- Soil science
- Process engineering
- Climate Change
Collaborative Project
FOR 2337: Denitrification in Agricultural Soils: Integrated Control and Modelling at Various Scales
