Effects of zeolite amendment on microbial biomass and respiratory activity in heavy metal contaminated soils
2003
Muehlbachova, G. | Simon, T. (Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic))
A laboratory incubation experiment with zeolite and glucose was performed to evaluate the effects of zeolite amendment in heavy metal contaminated soils from two smelter areas on some microbial characteristics [Kremikovtzi (K1, K2) in Bulgaria and Pribram (P1, P2) in the Czech Republic]. The content of microbial biomass showed a tendency to decrease in Kremikovtzi soils whereas in Pribram soils no significant effects were found after zeolite amendment. Respiratory activity and metabolic quotient (qCO2) decreased on the second and third day in Kremikovtzi soils amended with zeolite, no effects were observed in Pribram soils. Heavy metals decreased the content of microbial biomass in Kremikovtzi soils whereas the contaminated soil from Pribram area had the highest microbial biomass. The respiratory activity did not show any significant effects of zeolites on the evolution of CO2 and qCO2 in heavy metal contaminated Pribram soil. The respiratory activity of non-contaminated Pribram soil remained lower than that of the contaminated one, however the addition of zeolite increased qCO2.
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