Interactions between anthropogenic sulphate and marine salts in the Bs horizons of acidic soils in Scotland |
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Authors: | H. Anderson S. Peacock A. Berg R. C. Ferrier |
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Affiliation: | 1. Macaulay Land Use Research Institute, Craigiebuckler, AB9 2QJ, Aberdeen, Scotland 2. Department of Geography, Westf?lische Wilhelms-Universit?t, Münster, Germany
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Abstract: | In laboratory adsorption experiments, the comparison of podzol Bs horizons from coastal and inland moderately-impacted catchments with those from a severely-acidified inland region has demonstrated the effect of marine inputs on SO42– -retention. Moderate sea-salt inputs and low acid deposition leads to the retention of most of the SO42– and the release of soluble Mg2+; increasing the marine salt loading causes the development of a selectivity towards retention of acidic SO42– and the retention of Mg2+. In the highly-impacted soil, the marine input caused a decrease in SO42– retention in open moorland soils. The opposite occurred under forest, due to the ion-exchange of marine Mg2+ for soil Al3+, increasing soil acidity towards the pH0 (Gillman and Uehara, 1980), which is depressed below that of its moorland equivalent. |
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Keywords: | Sulphate retention marine salts soil variable charge moorland and forest soils |
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