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Silva,Douglas Marcelo Pinheiro da; Campos,Milton César Costa; Franciscon,Uilson; Alho,Leandro Coutinho; Santos,Luis Antônio Coutrim dos; Paula Neto,Pérsio de; Bergamin,Anderson Cristian; Souza,Zigomar Menezes de. |
ABSTRACT Soils with an A horizon formed by human activity, an anthropogenic A horizon, are found in the Amazon Region. Few studies have examined the spatial distribution of the properties of these soils. We mapped the spatial variability of some soil properties in an area of Archaeological Dark Earth (ADE) in the Brazilian Amazon. A sampling grid was defined over an area of 42 × 88 m under cacao cultivation in which sampling points were established at a spacing of 6 × 8 m, for a total of 88 points. Samples were collected from the 0.00-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.30 m depth layers. Soil texture, aggregate stability, and organic carbon (OC) analyses were performed on disturbed soil samples. Undisturbed samples were used to determine soil... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Indian Dark Earth; Management systems; Amazon soils; Anthropogenic soils. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100415 |
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Souza,Kleberson Worslley de; Lima,Hedinaldo Narciso; Schaefer,Carlos Ernesto G.R.; Teixeira,Wenceslau Geraldes; Pulrolnik,Karina; Corrêa,Guilherme Resende. |
Despite the agricultural importance of Indian Black Earth (IBE) in the Amazon region, there are few studies that report on the relation between soil texture and chemical fertility of IBE. These soils of pre-Colombian origin, with high contents of P, Ca and other nutrients are found across the Amazon valley. IBE profiles were studied to evaluate the total contents of P, its primary chemical forms and the P transformation phases in areas with IBE soils of variable texture and in adjacent reference soils. The soil texture strongly influenced soil fertility, changing in terms of transformation of the primary P forms and, consequently, predominant P forms in IBE. Soils with texture varying between clay and heavy clay had higher total P contents and primary Ca-P... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon Black Earth; Soil P fractionation; Upland soils; Manacapuru; Amazon soils; Anthropogenic soils. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500027 |
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