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Impatti antropici e dinamica erosiva nella Tunisia occidentale

Impatti antropici e dinamica erosiva nella Tunisia occidentale

Fridhi Abdessalem

113,17 €
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Editorial:
KS OmniScriptum Publishing
Año de edición:
2026
Materia
Geografía
ISBN:
9786630374339
113,17 €
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Situato al confine tra la Dorsale e le alte steppe tunisine, il bacino idrografico inferiore dell’oued Htab è caratterizzato da precipitazioni intense e irregolari, con una media annua di 276 mm (1958-2008). Ciò si riflette sul regime di deflusso. Il contrasto topografico e la prevalenza di pendenze relativamente ripide, nonché la forma allungata di questo bacino idrografico (indice di compattezza 1,45), favoriscono una concentrazione piuttosto rapida delle acque di ruscellamento. La quantificazione dell’occupazione del suolo nel bacino idrografico ha messo in luce il ruolo del fattore antropico nell’aggravarsi della crisi erosiva. Con i propri interventi e le proprie pratiche colturali, in particolare il disboscamento della vegetazione spontanea, le successive arature, il sovrapascolamento e la mancanza di una gestione adeguata, l’uomo ha fortemente modificato il paesaggio rurale. Di conseguenza, la superficie della prateria ha perso il 58,6% della propria estensione tra il 1954 e il 2000. Allo stesso modo, nel corso dello stesso periodo la foresta ha conservato solo il 55% della sua superficie iniziale. Il disboscamento e il diradamento della foresta hanno conseguenze evidenti nell’accentuazione della dinamica dell’erosione idrica nella regione.

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