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Table 4. Morphological characteristics of the pedons. Both Liminka pedons had horizons that had a pHS3.5 (Fig. 4), a SO,-S content above 0.05% (Table 5) and yellow jarosite mottles at the 30— 65 cm depth (Table 4), which are the criteria of sulfuric horizons. Because they occurred within 50 cm of soil surface, these pedons classify as coarse silty, cryic Typic Sulfaquepts (Soil Sur- vey Staff 1996) and medium-textured Thionic Gleysols (FAO 1988). Both Liminka pedons also have sulfidic materials below the acidic horizons

Table 4 Morphological characteristics of the pedons. Both Liminka pedons had horizons that had a pHS3.5 (Fig. 4), a SO,-S content above 0.05% (Table 5) and yellow jarosite mottles at the 30— 65 cm depth (Table 4), which are the criteria of sulfuric horizons. Because they occurred within 50 cm of soil surface, these pedons classify as coarse silty, cryic Typic Sulfaquepts (Soil Sur- vey Staff 1996) and medium-textured Thionic Gleysols (FAO 1988). Both Liminka pedons also have sulfidic materials below the acidic horizons

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Table |, Characteristics of sulfidic materials and the sulfuric horizon.
Table |, Characteristics of sulfidic materials and the sulfuric horizon.
Table 2. General requirements of some acid sulphate soil units according to Soil Taxonomy (Soil Survey Staff 1996) and the legend of the FAO/Unesco Soil Map of the World (FAO 1988).
Table 2. General requirements of some acid sulphate soil units according to Soil Taxonomy (Soil Survey Staff 1996) and the legend of the FAO/Unesco Soil Map of the World (FAO 1988).
Fig. |. Locations of the pedons.
Fig. |. Locations of the pedons.
Fig. 3. The Ylistaro pedon from 0.80 m below. Fig. 2. The Liminka | pedon.
Fig. 3. The Ylistaro pedon from 0.80 m below. Fig. 2. The Liminka | pedon.
Results of each pedon and soil characteristics were tested separately. Means marked with the same superscript do no differ at P= 0.05. Results without superscripts were not tested, owing to too few replicates. NH,-oxalate extraction, pH 3.0 Table 3. Selected physical and chemical properties of the pedons."’
Results of each pedon and soil characteristics were tested separately. Means marked with the same superscript do no differ at P= 0.05. Results without superscripts were not tested, owing to too few replicates. NH,-oxalate extraction, pH 3.0 Table 3. Selected physical and chemical properties of the pedons."’
Fig. 4. Soil pH and redox potential of the Liminka | and 2 and Laitila 2 pedons, measured in the soil pit. Yli-Halla, M. Acid sulphate soils of Finland
Fig. 4. Soil pH and redox potential of the Liminka | and 2 and Laitila 2 pedons, measured in the soil pit. Yli-Halla, M. Acid sulphate soils of Finland
"’ Results of each soil and soil characteristics were testec separately, Means marked with the same superscript do no differ at P = 0.05. * Incubated samples, 0.01 M CaCl, extraction n.d. = not determined Table 5. Soil pH and SO,-S content of the pedons. '’
"’ Results of each soil and soil characteristics were testec separately, Means marked with the same superscript do no differ at P = 0.05. * Incubated samples, 0.01 M CaCl, extraction n.d. = not determined Table 5. Soil pH and SO,-S content of the pedons. '’
’ Finnish Meteorological Institute (1979) Agricultural Research Centre of Finland, unpublished dat Table 6. Soil temperatures in Finland, measured at the depth of 50 cm.
’ Finnish Meteorological Institute (1979) Agricultural Research Centre of Finland, unpublished dat Table 6. Soil temperatures in Finland, measured at the depth of 50 cm.
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BiologySoil ClassificationAcid SoilsSoil morphologySoil taxonomy
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