quarta-feira, dezembro 06, 2006

Agricultura Intensiva e Desertificação

Realizou-se no dia 24 de Novembro de 2006, pelas 21:30H uma palestra proferida pelo Professor Doutor Paulo Monjardino sobre "Agricultura Intensiva e Desertificação". Essa palestra efectuou-se no novo edifício do Campus de Angra do Heroísmo da Universiadade dos Açores, no Pico da Urze em Angra do Heroísmo.

Por definição deserto é uma zona árida ou sem população.
A tendência de desertificação a nível global tem vindo a aumentar nos últimos anos, sendo diversas as causas que a originam, das quais se destaca o aquecimento global e a agricultura.

A desertificação em várias regiões agrícolas tem-se devido a formas de agricultura não adaptadas aos ecossistemas, que têm levado, na maioria das situações, à perda de fertilidade dos solos devido à sua erosão, salinização e redução drástica do pH, assim como ao esgotamento de aquíferos; a maioria destes problemas tende a agravar-se com a intensificação da produção agrícola. Porém, em países com economia mais competitiva em que predominam condições de equidade, tem-se verificado algum abandono da actividade agrícola, o que tem implicado um incremento do êxodo rural e, em algumas regiões, à perda da sua população residente; nesse caso a perda de população ocorre mais frequentemente em regiões onde vigoram formas de agricultura extensiva, sendo de destacar a perda de competitividade com outros países e com outros sectores da economia.

São múltiplas as formas de evitar ou inverter a tendência para a desertificação, mas estas frequentemente não dependem apenas do grau de intensificação da agricultura, tendo sido enumeradas nessa palestra algumas das soluções mais relevantes para a resolução destes problemas.

20 Comments:

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