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Revista de Ciências Agrárias

Print version ISSN 0871-018X


ALVARENGA, Paula et al. Assisted phytostabilization of soils affected by mining activities using Lolium Perenne L.. Rev. de Ciências Agrárias [online]. 2011, vol.34, n.2, pp.117-130. ISSN 0871-018X.

We studied the application of Lolium perenne L. and of different organic residues in the assisted phytostabilization of mine-contaminated soils (Aljustrel Mine Area, Iberian Pyrite Belt). Although the application of the organic residues led to immobilization of Cu, Pb, and Zn in the soil, decreasing their effective available fraction, their concentrations in the above-ground plant material did not change. The accumulation factors (AF) obtained were AF(Cu) and AF(Pb) <<1, and AF(Zn) <1, allowing its election as a possible candidate for phytostabilization purposes. However, Pb and Cu concentrations in ryegrass shoots were considered toxic, which suggests that there is a risk of contamination of the human food chain. Multivariate statistical analysis emphasized sewage sludge as the organic residue with the greatest capacity to correct soil acidity, and to improve soil characteristics, followed by the compost obtained from municipal solid waste residues. However, an impaired growth was obtained when using the highest application rate (100 Mg ha-1) of both residues. All garden waste compost rates were unable to correct general soil constraints to plant growth.

Keywords : Accumulation factor; assisted phytostabilization; Lolium perenne L.; mine soils; organic residues.

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