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Avaliação do risco de desertificação do municÃpio de Tanda (NÃger)
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ISBN10: 6209520928
ISBN13: 9786209520921
Publisher: Edicoes Nosso Conhecimento
Published: Jan 30 2026
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209520921
Publisher: Edicoes Nosso Conhecimento
Published: Jan 30 2026
Pages: 52
Weight: 0.18
Height: 0.12 Width: 6.00 Depth: 9.00
Language: Portuguese
O municÃpio rural de Tanda, com uma estação chuvosa prolongada e atravessado pelo rio NÃger, é uma zona atraente. As interações com a população indÃgena exercem pressões sobre a regeneração da vegetação. Para avaliar o risco de desertificação, analisámos os dados pluviométricos diários de 1931 a 2007, calculámos os Ãndices diferenciais de vegetação (NDVI e SAVI) das imagens Landsat (1973, 1984, 1992 e 2002) e discutimos os resultados; por fim, a imagem do Google Earth é comparada com a fotografia aérea de 1975. A análise climática mostra uma variação interanual das precipitações, com alternância de perÃodos secos e húmidos. A comparação entre os anos 1984/1973 e 2002/1992 mostra uma tendência de diminuição dos Ãndices de vegetação, apesar do retorno a condições mais húmidas nos anos 1992 e 2002. Entre 1992/1984 e 2002/1973, os resultados mostram um aumento dos Ãndices de vegetação devido à s precipitações dos perÃodos húmidos (1992 e 2002) e traduzem a dificuldade de comparar condições climáticas diferentes.
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