Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas


  • Romário Pimenta Gomes Universidade Estadual Paulista
  • Milton César Costa Campos Universidade Federal do Amazonas
  • Marcelo Dayron Rodrigues Soares Universidade Federal do Amazonas
  • Douglas Marcelo Pinheiro Silva Universidade Federal do Amazonas
  • José Maurício Cunha Universidade Federal do Amazonas
  • Uilson Franciscon Universidade Federal do Amazonas
  • Laércio Santos Silva Universidade Estadual Paulista
  • Ivanildo Amorim Oliveira nstituto Federal de Educação, Ciência e Tecnologia do Pará
  • Wildson Benedito Mendes Brito Universidade Federal do Amazonas



Spatial dependence, Aggregate classes, Soil aggregation, Land use


Indian Black Earths (IBEs) are distributed throughout the Amazon. They are characterized by their high chemical fertility and agricultural potential. IBEs have high organic carbon, favouring the improvement of soil structure. This work aimed to evaluate the aggregates and organic carbon (OC) spatial variability in different IBEs in southern Amazonas. We evaluated the organic carbon spatial variability, mean weight diameter (MWD), soil bulk density (Ïb) and aggregate classes under three uses of soil: pasture, cocoa, and coffee. We collected 528 soil samples in a point grid according to its use at two depths: 0.0-0.05 m and 0.10-0.20 m. Results were subjected to variance, descriptive, and geostatistical analyses. We concluded that the soil use influenced the IBEs physical attributes soil behavior, concentrating the higher values of CO, aggregates > 2.00 mm, and MWD at 0.0-0.05 m in relation to Ïb and aggregates < 2.00 mm where the higher values were the ones at 0.10-0.20 m. Aggregates< 2.00 mm (0.10-0.20 m) and OC (0.0-0.05 m) did not show spatial dependence, while the class of aggregates > 2.00 mm was the only attribute which represented to be a natural characteristic of the soil, with a strong spatial dependence, independently the land use and depth. There was no spatial relationship between the attributes studied and the geomorphic diversity. 


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Author Biography

Milton César Costa Campos, Universidade Federal do Amazonas

Prof. Mestrado e Doutorado em Agronomia (Ciência do Solo)




How to Cite

GOMES, R.P., CAMPOS, M.C.C., SOARES, M.D.R., SILVA, D.M.P., CUNHA, J.M., FRANCISCON, U., SILVA, L.S., OLIVEIRA, I.A. and BRITO, W.B.M., 2017. Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas . Bioscience Journal [online], vol. 33, no. 6, pp. 1513–1522. [Accessed14 July 2024]. DOI 10.14393/BJ-v33n6a2017-37142. Available from:



Agricultural Sciences