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Conquêtes et dégradation du milieu au Maghreb oriental pendant l'Antiquité et le Moyen Age

Abstract : The autor tries to demonstrate that, during Antiquity and the Middle Ages, the fluctuations of geosystems, and the spreading of soil erosion in particular, are due to a specific combination of climatic and anthropogenic factors. A climatic fluctuation that tends to increase the intensity of rains, maybe of the total annual precipitations, can be effective on the slopes only if these slopes have been gragilized by the degradation of vegetation and by ploughing. In other words, phases of intense agricultural colonization or of spreading of the cultivated surface are very favourable to soil erosion. On the other hand, the invasion periods, in which nomadic spheherds play an important role, globally cause a retraction of cultivated surfaces and a spreading of natural vegetation or of pastures that limit soil erosion. Local exceptions can exist in irrigated areas or on terraced cultivation areas in the mountains.
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https://hal-amu.archives-ouvertes.fr/hal-01565165
Contributor : Jean-Louis Ballais <>
Submitted on : Monday, July 24, 2017 - 4:36:37 PM
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Jean-Louis Ballais. Conquêtes et dégradation du milieu au Maghreb oriental pendant l'Antiquité et le Moyen Age. L'homme et la dégradation de l'environnement, Oct 1994, Antibes, France. pp.331-344. ⟨hal-01565165⟩

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