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Universidade de Lisboa (2020)

Ecophysiological characterization of metallophyte species candidates for phytoremediation

Domingues, Inês Alexandra Moreira

Titre : Ecophysiological characterization of metallophyte species candidates for phytoremediation

Auteur : Domingues, Inês Alexandra Moreira

Université de soutenance : Universidade de Lisboa

Grade : Mestrado em Biologia dos Recursos Vegetais 2020

Résumé partiel
The largest metalliferous area in the Iberian Peninsula, known as Iberian Pyrite Belt, is now an area with several abandoned mines whose intense mining activity has resulted in a degraded environment with serious pollution problems, such as dust, acid mine drainage, tailings, soil heaps and others. Although these sites exhibit an inhospitable environment for most species, there are plant species that tolerate high contaminations of toxic metals and the low soil pH. These so called metallophyte species have physiological adaptations that allow them to survive, establish and reproduce in metalliferous environments. Moreover, most of these species contribute with phytoremediation processes and thus decreasing the bioavailability of toxic metals. For these reasons, ecological restoration of these sites should take in account the use of the already present vegetation. Furthermore, with an increase of the aridity in Portuguese Iberian Pyrite Belt, it’s essential to increase the resilience of these sites and this can be achieved by considering the United Nation’s Sustainable Development Goal 15 – Mining and Life on Land. The aim of this work was to determine the ecological niche and the physiological performance of eight plant species present in São Domingos mine : Erica australis, Erica andevalensis, Lavandula stoechas, Cistus ladanifer, Cistus salviifolius, Cistus monspeliensis, Agrostis castellana and Anarrhinum bellidifolium. To accomplish this, two types of experiments were held : greenhouse and insitu tests ; using the pH as a proxy for contamination. Greenhouse tests focused of germination and further following of physiological parameters (height and reflectance) on four contamination level’s substrates : commercial, mixed, contaminated 1 (from São Domingos mine) and contaminated 2 (from Santa Bárbara de Padrões). I

Mots clés  : Cobertura vegetal Desempenho Faixa Piritosa Ibérica Minas abandonadas Solo contaminado


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