Reabilitação da área mineira de São Domingos através da utilização de correctivos e a resposta fisiológica de Cistus salvifolius L. nos diferentes tratamentos aplicados

Mestrado em Engenharia do Ambiente - Instituto Superior de AgronomiaThe S. Domingos mine is included in the Iberian Pyrite Belt, one of the oldest mining districts in Europe that has one of the largest concentrations of polymetallic massive sulfide deposits. This work aims to study the soil phytostabilization of heap (gossan) from S. Domingos mine, using soil improvers (organic and inorganic) and Cistus salviifolius L. (autochthonous species adapted to extreme environments). The amendments used were: biomass ash (2.5 g/kg of the soil), mixture of organic waste (O.M., 120 soil g/kg) and mixture of both. The soil has very acid pH (3,44-3,54), high total concentrations of potentially toxic elements, As, Cu and Pb, and low concentration of organic C. The soil available fraction of elements, Al, Ca, Fe, K e Mg, is, in generally, < 8,4 % of their total concentration in soil. The soil available fraction of As, Cu, Mo, Pb and Zn is < 4,3 % of the total, but for V it lies between 8,0 and 8,3 % of the total and for Mn it lies between 21,2 and 24,8 %. The best vegetative development and without visible signs of toxicity, occurred in the treatments with O.M. and cinza+O.M.. The plants are not accumulators of potentially toxic elements. It was observed high activity in the O.M. treatment of the soluble fraction and the ionically bound fraction in the ash+O.M. treatment in roots, in the Catalase (CAT) activity. As for the activity of Peroxidase (POD), the soluble fraction is slightly higher in roots than in shoots, and the ionically bounded fraction has high values both in shoots and roots. The application of amendments enables a better development of C. salviifolius and decreases the concentration of chemicals in the soil