Horizons de surface de sols ferrugineux tropicaux cultivés d'Afrique de l'Ouest (Burkina Faso et Mali) : étude des microstructures par l'approche fractale

Abstract : The gefuric, chitonic and porphyric relative distributions were recognized in sub-surface Alfisols microstructures. The gefuric microstudures were correlated with low clay content and subrounded bridges (malian alfisols). On the opposite, the porphyric microstructures were correlated with hight silt, clay and iron content (Burkina faso alfisols). Image analysis and fractal geometry (geometric and geostatistic approaches) were useful tools for characterizing these microstructures in the 0,01-1 mm range. The porosity was closely controled by the fractal dimension Dm of the "mass" (soil particules and microaggregate). It was suggested that this dimension was generated by an Difflusion Limited Aggregation (DLA) Model. Conversely, at a given scale rate, the porosity decreased versus the fractal dimension Dm. The geostatistical and fractal approach gave complementary structural informations: - the sill of the fractal elementary domains (0,1 to 0,3 mm) was positively correlated with the clay fraction; - this spatial short-range structuration was characterized by 3 fractal, by a nested brownian fractal model (three nested fractal domains); - periodic structures observed on the variogramm at long distance, in the weakly spatially structured domain, were interpreted as being repetitions of the elementary fractal domain.
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Philippe Dutartre. Horizons de surface de sols ferrugineux tropicaux cultivés d'Afrique de l'Ouest (Burkina Faso et Mali) : étude des microstructures par l'approche fractale. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 1993. Français. ⟨NNT : 1993NAN10307⟩. ⟨tel-01747155⟩

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