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Atividade humana e disfunção das zonas húmidas do Baixo Saara
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ISBN10: 6209835600
ISBN13: 9786209835605
Publisher: Edicoes Nosso Conhecimento
Published: Apr 8 2026
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209835605
Publisher: Edicoes Nosso Conhecimento
Published: Apr 8 2026
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
A disfunção geoquÃmica do chott de Ain El Beida foi evidenciada após a observação desta zona húmida entre dezembro de 2010 e maio de 2011. Geologicamente, o fundo, constituÃdo por areias, evaporitos e matéria orgânica não degradada, caracteriza-se por uma grande variação lateral de fácies. A facies quÃmica das águas varia entre clorada e clorada sódica e potássica. O pH, a salinidade, a densidade, a alcalinidade das águas, bem como os teores dos iões principais, apresentam uma evolução anormal durante o perÃodo de observação; espacialmente, evidenciam a heterogeneidade das águas do chott. Trata-se de um lago efémero fortemente influenciado pela ação antropogénica e muito sensÃvel à s variações das condições climáticas. Com efeito, o afluxo permanente de águas residuais e de irrigação e a alternância de perÃodos quentes e frios estão na origem das paragens recorrentes da evaporação, induzindo o mau funcionamento geoquÃmico deste ecossistema classificado como zona húmida das regiões desérticas.
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