ALUMINUM SPECIATION AND PHYTOTOXICITY IN MINESOILS OF A LIGNITE MINE IN NW SPAIN

The soil solution composition and the solution aluminium speciation we re used to evaluate the Al phytotoxicity risks in the reclaimed soils of the lignite nine in As Pontes, NW Spain, The vegetation decline in some soils containing sulphides appears to relate to the high acidity and salinity rising from sulphide oxidation rather than to the high al uminium concentrations, The high concentrations of SO42- and base cati ons, particularly Ca2+ and Mg2+, play an remarkable detoxifying role i n these environments.