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The origin of the Amazonian Dark Earths is not entirely clear and several conflicting theories were discussed in the past. These soils might have formed on fallout from volcanoes in the Andes, since they were only found on the highest spots in the landscape. Other theories included a formation as a result of sedimentation in Tertiary lakes or in recent ponds. It is now widely accepted that these soils were not only used by the local population but are a product of indigenous soil management. Whether they were intentionally created for soil improvement or whether they are a by-product of habitation is not clear at present time. This is in part due to the varied features of the dark earths throughout the Amazon Basin. References
See also Tropical Soil s External links |