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Genesis of Bisequal Soils on Acidic Drift in the Upper Great Lakes Region, USA

Dep. of Soil Sci., 1525 Observatory Dr., Univ. of Wisconsin, Madison, WI 53706-1299

View larger version (36K): [in a new window]   Fig. 1. Location of pedons within the Southern Superior Uplands, including the Winegar Moraines Subsection (212Jc), the Brule and Paint Rivers Drumlinized Ground Moraine Subsection (212Jl), and the Northern Highland Pitted Outwash Subsection (212Jm).

View larger version (20K): [in a new window]   Fig. 2. Distribution of Fe, Al, and Si in bulk precipitation, throughfall, and the soil solution at three depths, the bottom of E the horizon (ca. 18 cm), within the Bs horizon (ca. 48 cm), and within the fragipan or BC horizon (70-120 cm) of Alfic Oxyaquic Fragiorthods and Typic Haplorthods.

View larger version (30K): [in a new window]   Fig. 3. Evolution of soils on sandy loam and sandy loam materials that are underlain by sand and gravel in the upper Great Lakes region.