Physical and geospatial attributes of inceptisols and ultisols under native vegetation in Humaitá, AM, Brazil


  • Leandro Coutinho Alho Instituto Federal de Educação, Ciência e Tecnologia do Amazonas
  • Milton Cesar Costa Campos Universidade Federal do Amazonas
  • Bruno Campos Mantovanelli Universidade Federal Rural de Pernambuco
  • Douglas Marcelo Pinheiro Silva Universidade Federal Rural de Pernambuco
  • Zigomar Menezes Souza Universidade de Campinas
  • Jose Mauricio da Cunha Universidade Federal do Amazonas
  • Marcelo Dayron Rodrigues Soares Universidade Federal do Amazonas



Soils attributes, Natural grasslands, Forest


Natural grasslands with savannah-like characteristics associated to forest mosaics are found within Southern and Eastern Amazonas, Western Rondônia and Northern Roraima, being conditioned to local edaphic factors. The aim of this study was to assess both physical and geospatial attributes of an Cambisol under natural grasslands and an Ultisol under a forest fragment in Humaitá - AM, Brazil. In each area, we established a sampling grid in the dimensions of 70 × 70 m, with regular sampling spacing of 10 m and three collection depths: 0.0-0.05, 0.05-0.10 and 0.10-0.20 m, totaling 192 sampling points. Macroporosity (MaP), microporosity (MiP), bulk density (Ds) and total porosity (TP) were determined by soil samples with preserved structure, using a volumetric ring. Soil resistance to penetration (SRP) was measured by an automatic penetrometer after being subjected to a 0.006 MPa tension. Data were submitted to descriptive statistics and geostatistics analysis. The soil under natural grasslands showed values considered critical of Ds, SRP, MaP at all evaluated depths, with significant values at 0.10-0.20 m layer of 1.54 kg dm-3; 2.08 MPa and 0.05 m3 m-3, respectively. Ultisol under the forest fragments showed higher range values and consequently greater geospatial continuity due to the assessed physical attributes, since this soil has a greater stability of its physical structure. Based on the physical properties of the soil, structural function ineffectiveness of the Ultisol is a key factor for the occurrence of grassland in this region.


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Author Biography

Milton Cesar Costa Campos, Universidade Federal do Amazonas

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




How to Cite

ALHO, L.C., CAMPOS, M.C.C., MANTOVANELLI, B.C., SILVA, D.M.P., SOUZA, Z.M., CUNHA, J.M. da and SOARES, M.D.R., 2016. Physical and geospatial attributes of inceptisols and ultisols under native vegetation in Humaitá, AM, Brazil . Bioscience Journal [online], vol. 32, no. 2, pp. 422–430. [Accessed24 February 2024]. DOI 10.14393/BJ-v32n2a2016-32656. Available from:



Agricultural Sciences