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Sampling density and proportion for the characterization of the variability of Oxisol attributes on different materials

Siqueira, D.S. ; Marques, J. ; Pereira, G.T. ; Barbosa, R.S. ; Teixeira, D.B. ; Peluco, R.G.

Geoderma, 2014-11, Vol.232-234, p.172-182 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    Sampling density and proportion for the characterization of the variability of Oxisol attributes on different materials
  • Autor: Siqueira, D.S. ; Marques, J. ; Pereira, G.T. ; Barbosa, R.S. ; Teixeira, D.B. ; Peluco, R.G.
  • Assuntos: Agreement index ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; Brazil ; Clay (material) ; Density ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; Magnetic permeability ; Magnetic susceptibility ; Sampling ; Sampling plan ; Saturation ; Soil sampling ; Soils ; Stratified sampling ; Surficial geology
  • É parte de: Geoderma, 2014-11, Vol.232-234, p.172-182
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Establishing a soil sampling plan is one of the most important stages for providing the detailed information required for sustainable land management. This study aims to investigate the most appropriate sampling density and proportion for the characterization of Oxisol attributes on different materials, using the magnetic susceptibility (MS). The studied area is located in São Paulo State, Brazil, in Guatapará Town and its size is 380ha. To evaluate the subsampling effect in the variability description, 60 samples were collected from part of the area (150ha) in the density of one point per 2.5ha, using both simple sampling and subsamples with three points. Different sampling densities were obtained (3; 4; 5; 6; 7; 8; and one point per 9ha) by the exclusion of points. The evaluated attributes were: clay content; base saturation and MS at 0.00–0.25 and 0.25–0.50m depths. There were no differences among spatial variability maps generated from either simple or subsamples. This information might precede a change in the sampling system for the agricultural industry. The minimal sampling density required so that there is no loss in the spatial variability representativeness was one point per 7ha. MS may be used to upgrade clay content estimates in the sampling proportion of three points of MS for per clay point (one point per 2.5ha for MS: one point per 7ha). •Magnetic susceptibility in the sampling plans of soil•Sampling plans and subsample for representation of spatial variability•Sampling plans for geological compartments transition
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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