Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326587
Type: Artigo
Title: Spatial Variability Of Soil Properties In Archeological Dark Earth Sites Under Cacao Cultivation
Author: Pinheiro da Silva
Douglas Marcelo; Costa Campos
Milton Cesar; Franciscon
Uilson; Alho
Leandro Coutinho; Coutrim dos Santos
Luis Antonio; Neto
Persio de Paula; Bergamin
Anderson Cristian; de Souza
Zigomar Menezes
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 x 88 m under cacao cultivation in which sampling points were established at a spacing of 6 x 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 macroporosity (Macro), microporosity (Micro), total porosity (TP), and soil resistance to penetration (RP). The results were analyzed by descriptive statistic, Pearson correlation (p<0.01), and geostatistics. Soil bulk density, total pore volume, and geometric mean diameter are dependent on the total amount of OC in the ADE area. Increased soil bulk density and RP are proportional to a decrease in OC content and lower Micro and TP. Moreover, soil resistance to penetration is influenced by soil water and clay content with depth.
Subject: Indian Dark Earth
Management Systems
Amazon Soils
Anthropogenic Soils
Editor: Soc Brasileira de Ciencia do Solo
Viçosa
Rights: aberto
Identifier DOI: 10.1590/18069657rbcs20140816
Address: http://www.scielo.br/scielo.php?pid=S0100-06832016000100415&script=sci_arttext
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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