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Title: Properties of carbon particles in archeological and natural Amazon rainforest soils
Authors: Pandey, Sugandha Dogra
Rocha, Leonardo Cristian
Pereira, Gabriel Ribas
Deschamps, Camila
Campos, João Luiz Elias
Falcão, Newton P.S.
Prous, André P.P.
Jório, Ado
Keywords: Anthropogenic Effect
Black Carbon
Carbon Storage
Forest Soil
Geographical Region
Soil Carbon
Soil Fertility
Soil Nutrient
Rio Negro
Rio Negro [south America]
Issue Date: 2020
metadata.dc.publisher.journal: Catena
metadata.dc.relation.ispartof: Volume 194
Abstract: Driving practices of Amazon native inhabitants are an example of positive feedback in carbon storage acting as a key element in soil fertility and stability. The anthropogenic Amazonian Terra Preta do Índio (Indian Dark Earth) soils are rich in pyrogenic black carbon and the Rio Negro (Black River) also exhibits plentiful apparently similar black-carbon particles. In this context, we characterized the structural, morphological and elemental properties of the long-lived stable carbon-based structures present in sediments of the Amazonian Rio Negro and in two Terra Preta do Índio soils from two different geographic regions. Optical microscopy, Raman spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy techniques are utilized. The structural analysis displayed that these carbon structures exhibit similar nanocrystallite structures, despite their different geographic location and environment. The Terra Preta do Índio-carbons are however, more defective and the quantitative elemental analyzes indicate they have greater variety of nutrients, such as P and Ca, than Rio Negro sediment-carbons. © 2020 Elsevier B.V.
metadata.dc.identifier.doi: 10.1016/j.catena.2020.104687
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