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 vastly superior. Soil enhancement practices by means of historic Amerindians allowed them to domesticate the land intensively, without having to repeatedly transparent new fields from wooded area. As expanding populations position ever higher strain on tropical forests, this legacy of wealthy, 'living' soils warrants extra learn within the look for high-yield, land-intensive, but sustainable different types of administration. The overseas crew of individuals to this quantity offers numerous stances centering on facets 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
Black Earth sites are plotted in Fig. 3 according to their relationship to one another in multidimensional space. The removal of one or more indices of site modification had no significant effect on the relative placement of Black Earth sites on the results graph, indicating that variables tend to vary tagether and that the selected variables are, in fact, good indices of anthro- Axis2 Fig. 3. Multidimensional scaling of Black Earth sites according to multiple indices of anthropogenic soil modification A Geographical Method for Anthrosol Characterization in Amazonia 43 R -6var,b Axis2 Fig.
Grundzüge der Geologie des unteren Amazonasgebietes (des Staates Pani in Brasilien). Von Max Weg, Leipzig Köge! I (1987) Organische Stoffgruppen in Waldhumusformen und ihr Verhalten während der Streuzersetzung und Humifizierung. Bayreuther Bodenkundl Berichte 1:131 pp Kögel-Knabner I (1993) Biodegradation and humification processes in forest soils. In: Bollag JM, Stotzky G (eds) Soil biogeochemistry. Marcel Dekker, New York, pp 101-137 Petersen J, Neves EG, Heckenherger MJ (2001) Gift from the past: terra preta and prehistoric Amerindian occupation in Amazonia.
1979; Smith 1980; Eden et al. 1984; Kern and Kämpf 1989; Pabst 1991; Glaser 1999; Evolution of the Scientific Knowledge Regarding Archaeological Black Earths 23 Woods and McCann 1999). These studies have demonstrated the high fertility of these soils, standing out in relation to those commonly found in the region. In all analyzed samples, the Ca levels were more elevated than those of Mg, K, and Na, because of the major affinity with the cation exchange capacity of soil. A maximum value of 520 mmolc kg- 1 was registered in the ABE of Belterra (Pabst 1991) and a minimum, below lOmmolckg- 1 in the Colombian ABE (Eden 1984).
Amazonian Dark Earths: Explorations in Space and Time by William I. Woods, Bruno Glaser (auth.), Dr. Bruno Glaser, Professor William I. Woods (eds.)