COMPARISON OF DEVELOPMENT AND METABOLIC-ACTIVITY OF ALGAE AND BACTERIA IN SOILS UNDER THE INFLUENCE OF SHORT-TERM AND LONG-TERM CONTAMINATION WITH METALLURGICAL INDUSTRIAL DUSTS

In soils affected by long-term (P) and short-term (M) treatment with c admium industrial dusts at the dose of 0, 100, and 2000 t km-2 year-1 a similar association of bacteria and algae developed. Genera Chlamydo monas and Chlorhormidium in M(o) and P(o), and Stichococcus and Pseudo coccomyxa in contaminated soils prevailed. Biomass of bacteria exceede d that of algae. Respiration activity of bacteria (R(b)) and the photo synthetical activity of algae (F(a)) decreased with an increasing cont amination of soils, stronger inhibition of R(b) and F(a) being distinc tly noted in P than in M soils. In M2000 the respiration of algae (R(a )) was greater than that in P2000. In these soils R(a) prevailed over F(a), suggesting a heterotrophical diet of algae. Total diel activity of soil microorganisms (R(T)) decreased in P soils and increased in M soils with the growing degree of their contamination with the dusts.