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• W2020145425 abstract "Soils, regoliths and their parent materials were investigated in relation to the development of badlands in the Pre-Pyrenees, in NE Spain, on Late Cretaceous mudrocks under a mountain Mediterranean climate. Whilst all the soils in the area which are developed on mudrocks show a good structure and support a dense plant cover, the bare parent materials slake very rapidly giving rise to badlands characterized by high erosion rates. Several physical, chemical, mineralogical and micromorphological properties of soils, regoliths and related parent materials were analyzed in order to explain their different susceptibility to erosion and to determine which of all these properties are better related to such erosive behaviour. Only micromorphological and porosity properties were able to explain the erosion susceptibility, whilst mineralogical, chemical and physico-chemical (specific surface area) properties were not. Among the aggregate stability tests performed to estimate the relationships of soil components with the susceptibility to erosion, the Emerson test for macroaggregate evaluation, was particularly well suited. Although no good correlation was found between the Emerson test classes and organic matter content, we observed that the degree of slaking in organic-rich horizons, was always lower than in subsurface horizons and regoliths. Consequently, as far as organic rich aggregates are present in the soil surface, the influence of water in producing slaking, swelling and then erosion, will be minimum. However, when regoliths and rocks are uncovered, the influence of water in these particular materials, through freeze-drying and swell-shrinking, will give rise to mudrock desintegration leading to accelerated erosion. Se caracterizan fisica, quimica, mineralo´gica y micromorfolo´gicamente unas lutitas de finales del Creta´cico, en el Prepirineo catala´n, y los suelos desarrollados sobre ellas, en relacio´n con el desarrollo de badlands. Mientras todos los suelos de la zona desarrollados sobre lutitas presentan una buena estructura y soportan una buena cubierta vegetal que impide la erosio´n, las propias lutitas se disgregan y erosionan muy ra´pidamente dando origen a una morfologi´a de badlands. So´lo la micromorfologi´a y la porosimetri´a de Hg son las metodologi´as analizadas que mejor explican los procesos conducentes a la erosio´n, mientras que los resultados de la mineralogi´a, la qui´mica y la superficie especi´fica de los materiales presentan pocas relaciones con la susceptibilidad a la erosio´n de los materiales. Entre las pruebas de estabilidad estructural llevadas a cabo para estimar las relaciones de los constituyentes del suelo respecto a la susceptibilidad a la erosio´n, el test de Emerson para evaluar la estabilidad al agua de los macroagregados, fue el me´todo ma´s ido´neo. A pesar de que no se encontro´una buena correlacio´n entre las clases del test de Emerson y los contenidos de materia orga´nica, se observa que el grado de dispersion en los horizontes superficiales, ricos en materia orga´nica, es siempre inferior al de los horizontes sub-superficiales. Asi pue´s, mientras hay agregados ricos en materia orga´nica, la influencia del agua en disgregar, hinchar y en consecuencia erosionar es mi´nima. Sin embargo, cuando se decapan los horizontes orga´nicos y queda el regolito o la lutita al descubierto, la influencia del agua en los proceos de hielo-deshielo y/o hinchamiento-desecacio´n, da lugar a una disgregacio´n de la lutita conducente a una erosio´n acelerada." @default.
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• W2020145425 date "1992-06-01" @default.
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• W2020145425 title "How mudrock and soil physical properties influence badland formation at Vallcebre (Pre-Pyrenees, NE Spain)" @default.
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• W2020145425 doi "https://doi.org/10.1016/0341-8162(92)90003-t" @default.
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