Contrasting structures in the subsoil of the boulbènes of the Garonne basin, France

Dissolution and Precipitation of Carbonates in Arid Soils (Calcretes), Ksabi Basin, Morocco; Consequences on the Desertification. In an arid region of North‐Eastern Morocco (Ksabi basin, central Moulouya), formation and conditions of carbonate accumulation in coarse alluvium were studied. All levels of pleistocene terraces were affected by those accumulations, among them the ones of pedological origin (calcretes) were caracterized. Three categories were chosen, typical of a terrace level belonging to recent, middle, or older Pleistocene, respectively. Macroscopic and microscopic studies of coarse calcareous elements, and of carbonated precipitates in all horizons of each profile, showed that coarse calcerous elements were partly dissolved. The study of the dissolving process outlines a seven stage‐distribution showing an interdependence: one between the seven stages and the age of the terrace level; the other one between the seven stages and the pedological horizon. Those seven stages characteriz...

Dissolution et precipitation des carbonates dans des Sols (Calcrètes) en zone aride, bassin de Ksabi, moyenne moulouya, maroc: Consequence sur la desertification

ABSTRACT The term toposequence, proposed to designate a lateral succession of soils on a slope due to the influence of topography, began to be used differently over time, distancing itself from its original concept. Here, we discuss how this concept has been used since its inception. We carried out bibliometric analyses of publications in the database available on the Web of Science since 1900. Three main approaches and related concepts, explicit or not, one at a regional scale and two others at a local scale were identified. From this analysis, we suggest: a) when the approach is regional, the term geomorphic surface or position in the landscape should be used to address the spatial distribution and genetic implications of soils at this scale; b) when dealing with series/sequences of soils on slopes for mapping purposes or discontinuous profiles that emphasize taxonomic classification, the term catena should be used; c) when the determining factor of the soil sequence is climatic, biotic, lithological, chronological, the corresponding term climo-, bio-, litho- or chronosequence should be used; d) when dealing with a lateral succession of horizons in the continuum on slopes, resulting from the influence of topography on soil formation, which may reflect the soil contribution to the model evolution, only in this case should the term toposequence be used, returning to its original concept. 

Toposequence: What are we talking about?

Transformations des carbonates dans une sequence de sols developpees sur marnes dans Le Bassin Aquitain, France

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Transformations des carbonates dans une sequence de sols developpees sur marnes dans Le Bassin Aquitain, France