The total and extractable contents of Pb and Cu (in 1 M of ammonium acetate) were determined in the soil, at different distances from a smelter for working up Pb-Cu ores. An increased content of available Pb has a decisive influence on the rhizosphere. Cellulolytic activity decreases in the direction to the emission source. The spectrum of plant species decreased by the toxic influence of Pb and Cu available to the plants. Agrostis tenuis showed a high tolerance index.