Temporal evaluation of soil chemical attributes after slash-and-burn agriculture in the Western Brazilian Amazon
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Data
2019-01-01
Autores
Silva Neto, Eduardo Carvalho da
Pereira, Marcos Gervasio
Frade Junior, Elizio Ferreira
Silva, Sandra Bezerra da
Carvalho Junior, Joao Andrade de [UNESP]
Santos, Jose Carlos dos
Título da Revista
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Editor
Univ Estadual Maringa, Pro-reitoria Pesquisa Pos-graduacao
Resumo
In Amazonia, the main causes of deforestation are systems based on slash-and-burn agriculture. The objective of this work was to evaluate temporal changes in the soil chemical attributes after the vegetation has been slashed and burned in an area of native forest in the Western Amazon. For this study, four hectares of forest in Cruzeiro do Sul, State of Acre, Brazil, was slashed and burned. The soil in the study area was classified as Ultisol (Argissolo Amarelo Distreifico tipico). Soil samples were collected over the course of one year, the first one being collected 16 hours after the burn and the others at 30, 60, 90, 150, 210, 270, and 360 days after the burn. The soil surface layers were more sensitive to fire action. Ashes from vegetation burn increased pH values, basic cations, and C values only in the first months, resulting in higher basal saturation values (V%). The practice of slash-and-burn after 12 months resulted in lower values of pH, Ca, Mg, K, and P and higher values of Al and H, as well as saturation by aluminum in the soil, indicating this practice contributes to the reduction of soil fertility.
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Palavras-chave
amazonian agroecosystem, soil fertility, cycling of nutrients, soil management, Brasil
Como citar
Acta Scientiarum-agronomy. Maringa: Univ Estadual Maringa, Pro-reitoria Pesquisa Pos-graduacao, v. 41, 10 p., 2019.