PROBABILITY OF PARTICLE-SIZE FRACTIONS OCCURRENCE IN DIFFERENT LANDFORMS

Knowing the variation of particle-size fractions, considering the relief forms, contributes for understanding the variation of other soil attributes. This work aimed to study the spatial distribution of the probability of particle-size fractions occurrence (clay, silt, very fine sand, fine sand, coa...

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Bibliographic Details
Published in:Engenharia na agricultura 2018-08, Vol.26 (4), p.352-359
Main Authors: Lima, Julião Soares de Souza, Silva, Samuel Assis, Pereira, Daniel Pena, Altoé, Marcelo Soares
Format: Article
Language:English
Subjects:
Clay
Curvature
Electron microscopes
Kriging interpolation
Landforms
Particle size
Random variables
Sampling
Sand
Silt
Soil sciences
Spatial analysis
Spatial distribution
Online Access:Get full text
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Summary:Knowing the variation of particle-size fractions, considering the relief forms, contributes for understanding the variation of other soil attributes. This work aimed to study the spatial distribution of the probability of particle-size fractions occurrence (clay, silt, very fine sand, fine sand, coarse sand, and total sand) in a clayey Oxisol with predominance of concave and convex curvatures. A sampling grid with 94 sampling points in 33x33m spacing at a depth of 0–0.20 m was built using a GPS. The spatial analysis was performed through indicator kriging. The spherical model was fit for all soil fractions, with ranges varying from 130 m to 280 m. In the region of convex curvature, the clay fraction presented the highest probability of occurrence (0.75 to 1.00), whereas in the concave region the coarse sand and total sand fractions presented the highest probability of occurrence. The very fine sand fraction and the silt did not present pattern of distribution in relation to the dominant curvatures of the relief.
ISSN:1414-3984
1414-3984
DOI:10.13083/reveng.v26i4.823