Articles | Volume 14, issue 18
Biogeosciences, 14, 4161–4193, 2017
https://doi.org/10.5194/bg-14-4161-2017
Biogeosciences, 14, 4161–4193, 2017
https://doi.org/10.5194/bg-14-4161-2017
Research article
21 Sep 2017
Research article | 21 Sep 2017

Process-based modelling of NH3 exchange with grazed grasslands

Andrea Móring et al.

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Cited articles

Bell, M., Flechard, C., Fauvel, Y., Häni, C., Sintermann, J., Jocher, M., Menzi, H., Hensen, A., and Neftel, A.: Ammonia emissions from a grazed field estimated by miniDOAS measurements and inverse dispersion modelling, Atmos. Meas. Tech., 10, 1875–1892, https://doi.org/10.5194/amt-10-1875-2017, 2017.
Betteridge, K., Andrewes, W. G. K., and Sedcole, J. R.: Intake and excretion of nitrogen, potassium and phosporus by grazing steers, J. Agr. Sci., 106, 393–404, https://doi.org/10.1017/S0021859600064005, 1986.
Betteridge, K., Hoogendoorn, C., Costall, D., Carter, M., and Griffiths, W.: Sensors for detecting and logging spatial distribution of urine patches of grazing female sheep and cattle, Comput. Electron. Agr., 73, 66–73, https://doi.org/10.1016/j.compag.2010.04.005, 2010.
Burkhardt, J., Flechard, C. R., Gresens, F., Mattsson, M., Jongejan, P. A. C., Erisman, J. W., Weidinger, T., Meszaros, R., Nemitz, E., and Sutton, M. A.: Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy, Biogeosciences, 6, 67–84, https://doi.org/10.5194/bg-6-67-2009, 2009.
Dennis, S. J., Moir, J. L., Cameron, K. C., Edwards, G. R., and Di, H. J.: Measuring excreta patch distribution in grazed pasture through low-cost image analysis, Grass Forage Sci., 68, 378–385, https://doi.org/10.1111/gfs.12000, 2013.
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Short summary
This study describes and evaluates a new ammonia (NH3) exchange model for grazed fields (GAG_field). GAG_field is able to simulate the main features of the observed NH3 fluxes. A sensitivity analysis for the non-meteorological model parameters showed that the sensitivity of the NH3 fluxes to a parameter varies among urine patches. Moreover, the fluxes modelled with a dynamic soil pH are similar if a constant pH 7.5 is used, suggesting a useful simplification for regional-scale model application.
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