02198naa a2200289 a 450000100080000000500110000800800410001902400560006010000180011624501940013426000090032852012360033765000130157365000150158665000160160165000130161765300160163065300270164665300150167370000200168870000160170870000230172470000190174770000190176670000170178577301060180221104702021-11-11       2019    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1590/1981-812220190001000132DOI1 aMACEDO, R. S.  aAmazonian dark earths in the fertile floodplains of the Amazon River, Brazilban example of non-intentional formation of anthropic soils in the Central Amazon region.h[electronic resource]  c2019  aAmazonian dark earths (ADEs) are fertile soils created by pre-Columbian Amerindian societies of the Amazon Basin. However, it is still not clear whether these soils were produced intentionally to improve infertile Amazonian upland soils or if they resulted from the accumulation of organic matter from sedentary settlements. This study characterizes the ADEs found in the naturally fertile alluvial floodplains of the Amazon River in the Central Brazilian Amazon according to total, exchangeable, and available contents of elements and organic carbon in soil profiles. ADEs contained higher levels of available elements and total P, Ca, Zn, and Cu. High total Cr, Ni, Co, and V content in these soils indicate that mafic minerals contributed to their composition, while higher contents of P, Zn, Ba, and Sr indicate anthropic enrichment. The presence of ADEs in floodplain areas strongly indicates non-intentional anthropic fertilization of the alluvial soils, which naturally contain levels of P, Ca, Zn, and Cu higher than those needed to cultivate common plants. The presence of archaeological sites in the floodplains also shows that pre-Columbian populations lived in these regions as well as on bluffs above the Amazon River.  aAmazonia  aAnthrosols  aArchaeology  aGleysols  aAntrossolos  aArqueologia amazônica  aGleissolos1 aTEIXEIRA, W. G.1 aLIMA, H. N.1 aSOUZA, A. C. G. de1 aSIVA, F. W. R.1 aENCINAS, O. C.1 aNEVES, E. G.  tBoletim do Museu Paraense Emílio Goeldi: Ciências Humanasgv. 14, n. 1, p. 207-227, jan./abr. 2019.