Variabilità spaziale dell'orizzonte gypsico in un ambiente mediterraneo semiarido della Sicilia centro meridionale

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Abstract

[automatically translated] Semiarid environment of south central Sicily there are soils which, while not directly evolving on chalky substrates are affected by the accumulation of secondary gypsum. Purpose of this paper is to highlight the characteristics and spatial distribution of the horizon gypsico own soils that evolve on a substrate devoid of plaster but are to be classified as Gypsisuoli. It was chosen an area consisting of a hillside to North-West South-East trend where there are soils that develop on marl clay of Pliocene "Trubi" and placed at a height lower than topographically to a chalky outcrop of the Messinian. Along the slope were identified where three transects with a mean interval of 40 meters are four pedon were opened for each transect. All pedon have been described in the field and championships for pedogenetic horizon for subsequent analytical characterization and taxonomic classification. Also along the transects of the observations were made with an average pitch of 10 meters and the soil was sampled every 20 cm to a depth of one meter. On soil samples it was determined the content plaster with the thermogravimetric method. These values were spatialized along the slope following a multivariate approach in relation to the plaster content measured at 5 sampling depth. Geostatistical analysis on the content in the soil plaster has highlighted an obvious variation along the slope correlated with the distance from the pad in which the plaster is emerging which shows a decreasing trend towards the base. The higher the anisotropy along the vertical profile of the soil that occurs mainly on the far slope of the valley. Finally, through the comparison of the digital elevation model (DEM) and the interpolation maps the spatial relationships are highlighted between the content in the plaster of the soil and the morphology of the slope.
Original languageItalian
Pages329-336
Number of pages8
Publication statusPublished - 2004

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