Reference work entry
Acid soils are defined in terms of redox‐pH master variables in Figure A3. In the WRB system of classification, the relevant reference soil groups with widest distribution are Acrisols, Ferralsols and Podzols, which are the main focus of this article (Table A4). Acid soils also occur in Andosols, Arenosols, Alisols, Albeluvisols, Cambisols, Histosols, Leptosols, Plinthosols, Planosols, Fluvisols, Regosols and Umbrisols. In those Fluvisols and mine soils (Espoli‐Anthropic Regosols) containing pyrite, extreme acidity develops on oxidation.
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