By William I. Woods, Bruno Glaser (auth.), Dr. Bruno Glaser, Professor William I. Woods (eds.)
The regenerative traits pointed out in prehistoric, anthropogenic Amazonian darkish earths recommend that notoriously infertile tropical soils may be significantly superior. Soil enhancement practices by way of old Amerindians allowed them to domesticate the land intensively, while not having to continually transparent new fields from wooded area. As expanding populations position ever higher strain on tropical forests, this legacy of wealthy, 'living' soils warrants extra research within the look for high-yield, land-intensive, but sustainable kinds of administration. The foreign workforce of individuals to this quantity offers quite a few stances centering on features of the beginning, distribution, variability, patience, and use of Amazonian darkish earths.
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Additional info for Amazonian Dark Earths: Explorations in Space and Time
Waste products of vegetative and animal origin produced large quantities of organic matter that remained at the place of habitation. In addition, the vegetative matter when not used for food consumption or feed had and often still has multiple uses either by the indigenous population or by the present-day mestizo. Palms, in particular, are the predominant material used to cover houses by the forest people, and they are considered an important source of characteristic chemical elements (Zn, Cu, and Mn) for the soils (Kern et al.
5YR2/ 0). In comparison to adjacent areas, ABEs present a somewhat lighter texture, they are better structured (fluffier), and they generally contain a high density of ceramic fragments, which diminishes with depth. The thickness of the A horizon of the adjacent areas varies from 10-15 cm, its soil color is brighter, and the structure is normally weak. The thickness of the AB and BA transitional horizons in the ABE varies from 20-60 cm. They present darker colors than the adjacent areas, varying from black (10YR2/1) to a very dark brown (10YR2/2).
Tukano ethnohistorical accounts suggesting sedentary horticultural activity among these groups are also curious for a region in which the predominance of Podzols limits Latosol distributions and also agricultural productivity (Salgado Vieira and Salgado Filho 1962; Klinge 1967; Salgado Vieira 1988). Arawak groups inhabiting the lower Rio Negro, where Latosols predominate, would certainly have been capable of sedentary occupation based on horticulture, fishing, and other subsidiary activities. These accounts would suggest that complex patterns of socio-political organization did exist, which in turn points to the likelihood of more permanent patterns of Settlement.