Articles | Volume 4, issue 4
SOIL, 4, 237–250, 2018
https://doi.org/10.5194/soil-4-237-2018

Special issue: Quantifying weathering rates for sustainable forestry (BG/SOIL...

SOIL, 4, 237–250, 2018
https://doi.org/10.5194/soil-4-237-2018

Original research article 26 Oct 2018

Original research article | 26 Oct 2018

Aluminium and base cation chemistry in dynamic acidification models – need for a reappraisal?

Jon Petter Gustafsson et al.

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Cited articles

Akselsson, C., Westling, O., Sverdrup, H., Holmqvist, J., Thelin, G., Uggla, E., and Malm, G.: Impact of harvest intensity on long-term base cation budgets in Swedish forest soils, Water Air Soil Pollut., 7, 201–210, https://doi.org/10.1007/s11267-006-9106-6, 2007. 
Berggren, D. and Mulder, J.: The role of organic matter in controlling aluminum solubility in acidic mineral soil horizons, Geochim. Cosmochim. Ac., 59, 4167–4180, https://doi.org/10.1016/0016-7037(95)94443-J, 1995. 
Bonten, L. T. C., Groenenberg, J. E., Meesenburg, H., and de Vries, W.: Using advanced surface complexation models for modelling soil chemistry under forests: Solling forest, Germany, Environ. Pollut., 159, 2831–2839, https://doi.org/10.1016/j.envpol.2011.05.002, 2011. 
Bonten, L. T. C., Reinds, G. J., Groenenberg, J. E., de Vries, W., Posch, M., Evans, C. D., Belyazid, S., Braun, S., Moldan, F., Sverdrup, H. U., and Kurz, D.: Dynamic geochemical models to assess deposition impacts and target loads of acidity for soils and surface waters, in Critical Loads and Dynamic Risk Assessments – Nitrogen, Acidity and Metals in Terrestrial and Aquatic Ecosystems, edited by: de Vries, W., Hettelingh, J.-P., and Posch, M., Springer, 225–252, 2015. 
Cosby, B. J., Wright, R. F., Hornberger, G. M., and Galloway, J. N.: Modelling the effects of acid deposition: assessment of a lumped parameter model of soil water and stream water chemistry, Water Resour. Res., 21, 51–63, https://doi.org/10.1029/WR021i001p00051, 1985. 
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Short summary
This paper investigates how different dynamic soil chemistry models describe the processes governing aluminium and base cations in acid soil waters. We find that traditional cation-exchange equations, which are still used in many models, diverge from state-of-the-art complexation submodels such as WHAM, SHM, and NICA-Donnan when large fluctuations in pH or ionic strength occur. In conclusion, the complexation models provide a better basis for the modelling of chemical dynamics in acid soils.