Abstract
In order to place acid sulphate soils (a.s. soils) of Finland in an international context, five pedons from cultivated a.s. soils from Liminka, Ylistaro and Laitila on the western coast of Finland were analyzed and classified according to Soil Taxonomy and the revised legend of the FAO/Unesco Soil Map of the World. Three of the pedons (Liminka 1 and 2, Laitila 1) had sulfuric horizons within 50 cm of soil surface and qualify as Typic Sulfaquepts. One pedon (Ylistaro) had a sulfuric horizon at the depth of 100-150 cm and was classified as a Sulfic Cryaquept. The fifth pedon (Laitila 2) did not have either a sulfuric horizon or sulfidic materials, but it had a pH
Highlights
Acid sulphate soils (a.s. soils) are soils in which, “as a result of processes of soil formation, sulphuric acid either will be produced, is being produced or has been produced in amounts that have a lasting effect on main soil characteristics” (Pons 1973)
Five representative pedons from three a.s. soil areas on the western coast of Finland are classified according to Soil Taxonomy and the revised legend to the FAO/Unesco Soil Map of the World
Major processes after drainage of soils formed in sulfidic sediments include 1) oxidation of sulfidic materials to sulfuric acid with a consequent decrease of pH and 2) leaching of watersoluble components, resulting in the decrease of base saturation
Summary
Acid sulphate soils (a.s. soils) are soils in which, “as a result of processes of soil formation, sulphuric acid either will be produced, is being produced or has been produced in amounts that have a lasting effect on main soil characteristics” (Pons 1973). The a.s. soils of Finland, mainly located on the coast of the Gulf of Bothnia, have developed in sulfidic sedimentaccumulated during theLitorina period of the Baltic sea (7000 - 3000 yr 8.P.). These soils were earlier studied mainly from the agricultural point of view (Kivinen 1938, Purokoski 1958, 1959, Erviö 1975, Erviö and Palko 1984). Five representative pedons from three a.s. soil areas on the western coast of Finland are classified according to Soil Taxonomy and the revised legend to the FAO/Unesco Soil Map of the World
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