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As plantas Invasoras na Floresta em Portugal: Uma Questão Ambiental
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Ao longo da história, a biodiversidade presente nos vários ecossistemas do planeta sempre sofreu alterações progressivas e profundas. Contudo, a partir do surgimento do ser humano, o ritmo e a magnitude de tais alterações aumentaram de forma abrupta. Entre as diversas modificações que as ações do ser humano têm provocado nos ecossistemas, uma das mais relevantes foi a transferência de espécies para locais onde conseguiram adotar comportamentos invasores. Atualmente, as espécies invasoras são consideradas como uma das maiores ameaças para a preservação da biodiversidade no mundo. Neste sentido, o trabalho presente tem como objetivo principal a realização de um diagnóstico e uma análise crítica da questão da invasão dos ecossistemas de Portugal Continental por plantas exóticas. Para isso, inicialmente são analisados os diversos impactos que estas provocam e que características tornam um ecossistema mais vulnerável a ser invadido. É também realizado um estudo da evolução da flora presente em Portugal, de modo a entender a situação atual tanto da vegetação em geral, como das plantas invasoras presentes no território. Os diversos impactos ambientais e socioeconómicos que as plantas invasoras provocam requerem que sejam implementadas medidas que visem o controlo e gestão das mesmas. Deste modo, é feita uma análise da forma como estas espécies são regulamentadas e monitorizadas, assim como dos métodos possíveis a serem adotados para a prevenção, deteção precoce e erradicação das mesmas. Uma vez que o caso do eucalipto é bastante polémico em Portugal, tanto a nível ambiental, como social, económico e político, este é abordado de uma forma mais aprofundada, de forma a entender a natureza de tais polémicas. Para além disso, ainda é discutida a viabilidade, assim como algumas formas de como os recursos oferecidos pelas plantas invasoras já presentes no território podem ser aproveitados, não sendo meramente desperdiçados. De modo a que as medidas de controlo de plantas invasoras sejam bem-sucedidas, é essencial que estas sejam aceites e apoiadas pelos cidadãos. Neste sentido, com a finalidade de fazer uma análise da perceção da população relativamente a plantas invasoras e seus impactos, foi realizado um inquérito à população residente de Condeixa-a-Nova. Para além de grande parte do Concelho de Condeixa-a-Nova ser ocupado por florestas, matos e pastagens, ou para fins agrícolas, o carácter relativamente jovem da sua população residente foram fatores que contribuíram para a escolha deste Concelho como área de estudo. Quanto aos resultados obtidos, a população inquirida demonstrou algum conhecimento sobre o que é uma planta invasora contudo, a magnitude dos impactos que estas causam é algo que ainda não está muito bem consolidado entre ela. Não obstante, a grande maioria considerou muito importante que sejam implementadas medidas com a finalidade de conter a propagação de plantas invasoras. Assim, o estudo comprovou que é crucial continuar a apostar na divulgação de informação sobre as espécies invasoras, contribuindo para a sensibilização da população geral sobre este problema e como resolvê-lo.
Throughout history, the biodiversity present in the various ecosystems of the planet has always suffered gradual and profound changes. However, since the appearance of mankind, the pace and magnitude of those changes have increased considerably. Of all the changes mankind has caused in the ecosystems, one of the most relevant ones was the geographic displacement of species to places where they were able to adopt invasive behaviours. Currently, invasive species are considered as one of the main threats to the preservation of biodiversity at a global scale. In this regard, the main goal of the present study is to develop a diagnosis and a critical analysis of the invasion of the ecosystems present in Continental Portugal by exotic plants, being in this way, a study of qualitative nature. For that, first of all, the various impacts caused by these species and the features that make an ecosystem more vulnerable to an invasion, are analysed. Another aspect that is looked into is the historical progress of the vegetation present in Portugal, in order to understand the current situation of the existent flora in general, and the invasive plants that exist in the territory. The various social and socioeconomic impacts caused by invasive plants require the implementation of measures that aim their control and management. Thus, the different ways of their regulation, monitorization and the possible ways to prevent, detect prematurely, and eradicate them are also examined. Since the case of eucalyptus is considerably controversial in Portugal, either at an environmental, social, economic or political level, it is discussed in greater depth, in order to understand the depth of such controversies. Furthermore, the feasibility, as well as some ways in which the resources offered by invasive plants already that are already present in the territory, can be used, not merely wasted, are also examined. In order for the control measures of invasive plants to be successful, it is essential for these to be accepted and supported by the citizens. In that respect, an enquiry was applied to the resident population of Condeixa-a-Nova, with the purpose of analysing the public perception regarding invasive plants. In addition to the fact that a large part of the Condeixa-a-Nova Municipality is occupied by forests, scrub communities, and pastures, used for agricultural purposes, the relatively young character of its population were factors that contributed for this Municipality to be chosen as the area of study. As for the results obtained, the surveyed population demonstrated some knowledge about what an invasive plant is, however, the magnitude of the impacts they cause is something that is still not very well consolidated. Nevertheless, the vast majority considered the implementation of measures in order to contain the spread of invasive plants very important. Thus, the study proved that it is crucial to continue to invest in the dissemination of information regarding invasive species, contributing to the awareness of the general public about this problem and how it can be solved.
Throughout history, the biodiversity present in the various ecosystems of the planet has always suffered gradual and profound changes. However, since the appearance of mankind, the pace and magnitude of those changes have increased considerably. Of all the changes mankind has caused in the ecosystems, one of the most relevant ones was the geographic displacement of species to places where they were able to adopt invasive behaviours. Currently, invasive species are considered as one of the main threats to the preservation of biodiversity at a global scale. In this regard, the main goal of the present study is to develop a diagnosis and a critical analysis of the invasion of the ecosystems present in Continental Portugal by exotic plants, being in this way, a study of qualitative nature. For that, first of all, the various impacts caused by these species and the features that make an ecosystem more vulnerable to an invasion, are analysed. Another aspect that is looked into is the historical progress of the vegetation present in Portugal, in order to understand the current situation of the existent flora in general, and the invasive plants that exist in the territory. The various social and socioeconomic impacts caused by invasive plants require the implementation of measures that aim their control and management. Thus, the different ways of their regulation, monitorization and the possible ways to prevent, detect prematurely, and eradicate them are also examined. Since the case of eucalyptus is considerably controversial in Portugal, either at an environmental, social, economic or political level, it is discussed in greater depth, in order to understand the depth of such controversies. Furthermore, the feasibility, as well as some ways in which the resources offered by invasive plants already that are already present in the territory, can be used, not merely wasted, are also examined. In order for the control measures of invasive plants to be successful, it is essential for these to be accepted and supported by the citizens. In that respect, an enquiry was applied to the resident population of Condeixa-a-Nova, with the purpose of analysing the public perception regarding invasive plants. In addition to the fact that a large part of the Condeixa-a-Nova Municipality is occupied by forests, scrub communities, and pastures, used for agricultural purposes, the relatively young character of its population were factors that contributed for this Municipality to be chosen as the area of study. As for the results obtained, the surveyed population demonstrated some knowledge about what an invasive plant is, however, the magnitude of the impacts they cause is something that is still not very well consolidated. Nevertheless, the vast majority considered the implementation of measures in order to contain the spread of invasive plants very important. Thus, the study proved that it is crucial to continue to invest in the dissemination of information regarding invasive species, contributing to the awareness of the general public about this problem and how it can be solved.
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Palavras-chave
Plantas Invasoras Biodiversidade Impactos Medidas de Controlo Perceção da População Invasive Plants Biodiversity Impacts Control Measures Public Perception