Indication of soil pollution by microbiological and biochemical methods
1998
Nemecek, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic)) | Podlesakova, E. | Macurova, H.
Microbiological and biochemical methods have been used to identify the ecotoxicologically relevant soil loads by hazardous elements. We used the simulated contamination (Cd 10 and 3, Cu 150, Ni 150, Zn 400 mg/kg in sulphate form). Biochemical tests proved that soil-specific characteristics were more expressive than contamination impacts. Inhibition of N mineralization, potential nitrification and N immobilization by Zn (Cu) was found in Regosol (RS) and Luvisol (LS), by Cd in Podsol (PS). High values of N immobilization by the end of the experiment were caused by the gradual increase of synthetic activities of microorganisms; in Chernozem (Ch) they reflect the soil-specific features. Comparison between limed and nonlimed variants expressed the strong influence of the pH regulation on the raise of bacteria and actinomycetes amount in all soils with a low buffering capacities and increase of Azotobacter. Inhibition of bacteria and actinomycetes by Zn was observed in most soils (except of Ch) before the pH regulation, after liming only in RS and LS, inhibition of Azotobacter in RS. Micromycetes were affected by Zn (Ni) in nonlimed RS, by Cd (Ni) in PS.
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