Variability and spatial correlation of aggregates and organic carbon in indian dark earth in Apuí region, AM


  • Romario Pimenta Gomes Universidade Estadual Paulista
  • Milton Cesar Costa Campos Universidade Estadual Paulista
  • Wildson Benedito Mendes Brito
  • Jose Mauricio Cunha Universidade Federal do Amazonas
  • Aleksander Westphal Muniz Embrapa Amazônia Ocidental, Manaus
  • Laercio Santos Silva Universidade Estadual Paulista
  • Edicarlos Damacena Souza
  • Ivanildo Amorim Oliveira Universidade Estadual Paulista
  • Ludmila Freitas Instituto Federal de Educação, Ciência e Tecnologia do Pará



Soil aggregation, Geostatistics, Cross variogram


Having in mind the importance of knowing the variability and spatial correlation of soil properties in Indian Dark Earth (IDE), we evaluated in this study the variability and the spatial correlation of aggregates and carbon in an Ultisol under coffee cultivation in southern Amazonas. It was established a 48 x 88 m sampling grid spaced 06 x 08 m, totalling 88 sampling points. Then soil samples were collected at: 0.0-0.05, 0.05-0.10, and 0.10-0.20 m layers. The spatial variability of the Mean Weighted Diameter (MWD) attributes, aggregates > 2 mm, < 2 mm, bulk density (BD) and organic carbon (OC) was analyzed by adjusting the simple semivariograms, while spatial correlations of the OC with aggregates and BD were analyzed by cross-semivariogram. We could conclude that there was spatial dependence in the variables, wherein the largest ones were observed at 0.0-0.05 m, except for Mean Weighted Diameter (MWD) and aggregates greater than 2.00 mm with larger range of values in depth from 0.05-0.10 and 0.10-0.20 m. The mean weight diameter and aggregate class attributes greater than 2.00 mm had negative spatial correlation with organic carbon at 0.0-0.05 m, while the smaller aggregates than 2.00 mm classes and bulk density correlated positively with organic carbon at 0.0-0.05 m and 0.10-0.20 m.


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Author Biography

Milton Cesar Costa Campos, Universidade Estadual Paulista

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




How to Cite

GOMES, R.P., CAMPOS, M.C.C., BRITO, W.B.M., CUNHA, J.M., MUNIZ, A.W., SILVA, L.S., SOUZA, E.D., OLIVEIRA, I.A. and FREITAS, L., 2018. Variability and spatial correlation of aggregates and organic carbon in indian dark earth in Apuí region, AM . Bioscience Journal [online], vol. 34, no. 5, pp. 1188–1199. [Accessed18 July 2024]. DOI 10.14393/BJ-v34n5a2018-39414. Available from:



Agricultural Sciences