Diversidade das comunidades bacterianas em solos de terra preta antropogenica da Amazonia Central e Oriental (in Portuguese) Diversity of the bacterial communities in Anthropogenic Black Earth from the Central and Oriental Amazon de Souza Cannavan, F. (2007)
Excerpt of the summary in Portuguese:
Terra Preta Antropogênica (TPA) e um dos tipos de solos mais ferteis do mundo. Devido a falta de informacoes sobre sua diversidade bacteriana, esta trabalho estudou a diversidade bacteriana em amostras de solos TPA coletadas em duas regioes: Lagoa Balbina e Floresta Nacional de Caxiuana.
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Additional information in English provided by Cecilia Carvalho Rodrigues:
Regarding the size, she mentions it in the end of the first paragraph of page 16 (pdf, p.17): “Nevertheless in the same region, one can find one of the most fertile soil in the world, identified as Terra Preta Antrpogênica (TPA) or Terra Preta de Índio, representing a small parcel of Amazon soil, probably covering at least 0.1 to 0.3% (15,500 – 20,700 km2) of the forested area of Amazonia (SOMBROEK et al. 2003)”. This section of her literature review is quite interesting. Regarding the dimension of occurrence, in the first paragraph of page 17 she says: ‘This kind of soil occurs in isolated round spots with differing dimensions (FALESI et al., 1972). The spots typically occupy small areas, around 0.5 and 3 hectares (SMITH, 1980), with however, indications of sites at the Estacao Científica Ferreira Penna – National Forest of Caxiuma (PA), extending over 100 ha. Despite the vast amount of archaeological sites already known, there is not a mapping of all occurrences of the ADE in Amazon.
Regarding the depth, it is generally around 30 to 60 cm, being possible to reach up to 2m deep (SMITH, 1980).
In her abstract, she uses the term ‘Anthropogenic Black Earth’ (ADE) instead of Terra Preta.
Bibliographic information
de Souza Cannavan, F. (2007). Diversidade das comunidades bacterianas em solos de terra preta antropogenica da Amazonia Central e Oriental (in Portuguese) Diversity of the bacterial communities in Anthropogenic Black Earth from the Central and Oriental Amazon MSc thesis, Universidade de Sao Paulo, Escola Superior de Agricultura, Brazil
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Diversidade das comunidades bacterianas em solos de terra preta antropogenica da Amazonia Central e Oriental
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