Amazonian Dark Earths (ADE), one of the best‐known examples of anthropogenic (man‐made) soils, are the result of Amerindian settlements in the pre‐Columbian period. ADE are highly variable in terms of their size, shape, depth and physical and chemical make‐up.
Scholars tend to divide ADE into two categories: terra preta and terra mulata. The former are dark and highly fertile soils replete with ceramic shards, indicating former areas of habitation, while the latter are lighter in colour, less fertile, lacking pottery and thought to
be old agricultural fields. While a scientific consensus on the origins of terra preta has existed for several decades, the origins of terra mulata remain enigmatic and contested. We argue that owing to the overlapping and constantly changing boundaries of agricultural and habitational
areas, it is unlikely that there exist two clear soil fertility classes. This article examines the hypothesis that rather than two distinct anthrosol categories, ADE sites should exhibit a highly fertile ‘core area’, which grades into more subtly modified soils, with a continuum
of fertility between them. Using principal components analysis (PCA) and interpolations based on the geographic distribution of the soil samples, we show that ADE along the Middle Madeira, Brazilian Amazon are extremely diverse, but data support more of a gradient between areas of greater
and lesser fertility rather than two distinct categories. We also assess local people's perceptions and classifications of anthropogenic and surrounding soils using ethnographic data. Rather than discarding the terra preta–terra mulata opposition however, we suggest abandoning
only the idea that they are separate categories, and instead emphasise a continuum, the darker, bluff edge ‘central’ regions with abundant ceramics are consonant with published descriptions of terra preta, which grade into surrounding areas with lighter, less fertile soils
that better fit terra mulata descriptions.
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Document Type: Research Article
Department of Anthropology, University of Sussex, Falmer, Brighton BN1 9SJ.
Embrapa Solos, Jardim Botânico 22460-000, Rio de Janeiro, RJ – Brazil
Instituto Nacional de Pesquisas da Amazônia: CPCA, Aleixo, Manaus, Amazonas 69011-970, Brazil
Department of Geography, University of Kansas, Lawrence, KS 66045, USA
Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853, USA
Publication date: 2011-09-01