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vol.22 número12Resíduos sólidos urbanos na produção de mudas de Aegiphila sellowiana Cham.Atributos físicos do solo e produtividadesde soja e milho cultivadas com água residuária índice de autoresíndice de assuntospesquisa de artigos
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Revista Brasileira de Engenharia Agrícola e Ambiental

versão impressa ISSN 1415-4366versão On-line ISSN 1807-1929

Resumo

SILVA, Jéssica C. N. et al. Aggregation, carbon, and total soil nitrogen in crop-livestock-forest integration in the Eastern Amazon. Rev. bras. eng. agríc. ambient. [online]. 2018, vol.22, n.12, pp.837-842. ISSN 1807-1929.  https://doi.org/10.1590/1807-1929/agriambi.v22n12p837-842.

Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages of macroaggregates, followed by the integration system with African mahogany. At a depth of 0-0.10 m, the contents and stocks of carbon were higher in the agricultural area and in the integration system with cumaru, whereas nitrogen contents and stocks were higher in the native forest, followed by the integration systems with mahogany and cumaru. Compared to the other systems, the pasture area stored more carbon at depths of 0-0.10 and 0.10-0.20 m.

Palavras-chave : organic carbon; soil physics; sustainability; Brazilian Amazon.

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