Abstract
Sverdrupet al. (1992) proposed a model intended to evaluate effects of soil solution (Ca2++Mg2+/Al3+ ratios on the uptake of Ca2+ and Mg2+ (here called base cations=BC) by tree roots. They considered the adsorption of BC on exchange sites on root surfaces to be a major step, and the competition between Al3+ and BC for exchange sites on roots to be crucial. Although this may certainly affect the rates of uptake, it will not exclude base cations from entering the root cells through ion channels or by carriers. Above all, the model overlooks important gradients in the rhizosphere, e.g. pH-gradients and root exudates, which have profound influences on the speciation of Al. One should instead consider modifying existing models accounting for processes in a buffered soil medium and handling gradients in the rhizosphere (e.g. Nye and Tinker, 1977). This would also require considerations on mycorrhizas and possible changes in the capacity for uptake of certain ions, which could be induced by deficiencies.
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Högberg, P., Jensén, P. Aluminium and uptake of base cations by tree roots: A critique of the model proposed by Sverdrup et al.. Water Air Soil Pollut 75, 121–125 (1994). https://doi.org/10.1007/BF01100404
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DOI: https://doi.org/10.1007/BF01100404