Journal article

Publication year: 2004

Pages: 619-632

Journal: Soil Biology and Biochemistry

Volume number: 36

Issue number: 4

ISSN: 0038-0717

DOI Link: https://doi.org/10.1016/j.soilbio.2003.12.006

Publisher: Elsevier

Abstract: 
A new N-15 tracing model was developed to analyse nitrogen (N) transformations in old grassland soil. There was a need to develop a new model because existing models such as FLUAZ were not able to simulate the observed N dynamics. The new features of the model are: (a) simulation of heterotrophic nitrification, (b) simulation of dissimilatory nitrate (NO3-) reduction to ammonium (NH4+) (DNRA), (c) release of adsorbed or stored fertiliser N into the available mineral N pools and (d) immobilisation of NH4+ and NO3- into two separate organic N pools with different re-mineralisation characteristics. The tracing model contains six N pools and nine simultaneous N transformations either at zero- or first-order kinetics. The model is set up in the modelling software ModelMaker which contains non-linear optimisation routines based on the Marquardt-Levenberg algorithm. The model is able to simulate data obtained from triple labelling studies where either the NH4+, the NO3- or both pools were labelled with N-15. The flexible modelling environment allows the user to develop the model further. (C) 2004 Elsevier Ltd. All rights reserved.

Harvard Citation style: Müller, C., Stevens, R. and Laughlin, R. (2004) A 15N tracing model to analyse N transformations in old grassland soil, Soil Biology and Biochemistry, 36(4), pp. 619-632. https://doi.org/10.1016/j.soilbio.2003.12.006

APA Citation style: Müller, C., Stevens, R., & Laughlin, R. (2004). A 15N tracing model to analyse N transformations in old grassland soil. Soil Biology and Biochemistry. 36(4), 619-632. https://doi.org/10.1016/j.soilbio.2003.12.006