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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2017-228
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
16 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
Implementing the Nitrogen cycle into the dynamic global vegetation, hydrology and crop growth model LPJmL (version 5)
Werner von Bloh1, Sibyll Schaphoff1, Christoph Müller1, Susanne Rolinski1, Katharina Waha1,2, and Sönke Zaehle3 1Potsdam Institute for Climate Impact Research, P.O. Box 60 12 03, 14412 Potsdam, Germany
2CSIRO Agriculture & Food, 306 Carmody Rd, St. Lucia QLD 4067, Australia
3Max Planck Institute for Biogeochemistry, P.O. Box 60 01 64, 07701 Jena, Germany
Abstract. The well-established dynamical global vegetation, hydrology, and crop growth model LPJmL is extended by a terrestrial nitrogen cycle to account for nutrient limitations. In particular, processes of soil nitrogen dynamics, plant uptake, nitrogen allocation, response of photosynthesis and maintenance respiration to varying nitrogen concentrations in plant organs, and agricultural nitrogen management are included into the model. All new model features are described in full detail and results of a global simulation of the historic past (1901–2009) are presented for evaluation of the model performance. We find that implementation of nitrogen limitation significantly improves the simulation of global patterns of crop productivity. Regional differences in crop productivity, which had to be calibrated via a scaling of the maximum leaf area index can now largely be reproduced by the model, except for regions where fertilizer inputs and climate conditions are not the yield limiting factors.

Citation: von Bloh, W., Schaphoff, S., Müller, C., Rolinski, S., Waha, K., and Zaehle, S.: Implementing the Nitrogen cycle into the dynamic global vegetation, hydrology and crop growth model LPJmL (version 5), Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2017-228, in review, 2017.
Werner von Bloh et al.
Werner von Bloh et al.
Werner von Bloh et al.

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Short summary
Dynamics of terrestrial carbon cycle are of central importance for Earth System science. Nutrient limitations, especially from nitrogen, are important constraints on vegetation growth and the terrestrial carbon cycle. Therefore we extended the well established global vegetation, hydrology and crop model LPJmL by a nitrogen cycle. We find a significant improvement of global patterns of crop productivity. Regional differences in crop productivity can now be largely reproduced by the model.
Dynamics of terrestrial carbon cycle are of central importance for Earth System science....
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