Impact of drainage on soil evolution: A morphological quantitative approach
Résumé
In order to better understand the process of morphological degradation and the impact of drainage on this process, morphological evolution of soil volumes was studied using image analysis of decimetric soil monoliths in Albeluvisol sampled along a soil sequence perpendicular to a drain. The geomorphological interrelationships of four different volume types (black, white-grey, pale-brown and ochre) are quantified. Results show that morphological degradation progresses by the progressive transformation of the ochre volume into pale-brown from their inner, around porosity, and their border. Black volume is simultaneously formed by centrifugal condensation of Mn into the ochre volume. As the process goes on, with decreasing distance to the drain, the ochre volume is atomised and the black volume is released into the pale-brown matrix. This pale brown matrix is further transformed into a white-grey volume formed into its core by centripetal evolution.
Domaines
Sciences de la Terre
Origine : Fichiers produits par l'(les) auteur(s)
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