sábado, setembro 22, 2007

Eutrofização da Lagoa das Sete Cidades - São Miguel

"Actualmente o agricultor deve ser o guardião da natureza, aplicando práticas ambientalmente sustentáveis. Nas Sete Cidades, isso só é possível se forem utilizados menos adubos e, consequentemente, se reduzir a produção. Para compensar os agricultores, seriam aplicadas ajudas compensatórias. Só desta forma se pode limitar ou mesmo eliminar o problema de eutrofização das lagoas". Esta afirmação é do Professor do Departamento de Ciências Agrárias da Universidade dos Açores, Jorge Pinheiro, que apresentou, nas Canárias, um trabalho da autoria de Jorge Pinheiro, Lourdes Matos e João Madruga, docentes e investigadores do mesmo Departamento e que reúne vários anos de estudos sobre as Sete Cidades. Jorge Pinheiro voltou a lembrar que "o problema da eutrofização nas lagoas das Sete Cidades está relacionado, pode-se dizer exclusivamente, com a utilização excessiva de adubos nos terrenos circundantes. "É preciso passar de um regime intensivo para um extensivo, para solucionar o problema".
A eutrofização das lagoas das Sete Cidades coloca, ainda, um problema em termos de impacto económico, visto que este se trata de um dos pontos turísticos mais fortes da ilha de São Miguel. No local tem-se verificado o crescimento acelerado de plantas aquáticas devido ao aumento de nutrientes, potenciado pelos adubos utilizados nas explorações agrícolas.
O trabalho "Eutrofización en lagos de Azores - Caracterización de la Cuenca de Siete Ciudades: Isla de S. Miguel", foi apresentado no III Simpósio espanhol sobre o controlo da degradação dos solos e da desertificação, que decorreu em Fuerteventura, arquipélago das Canárias.
(In Diário Insular)

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