Influence of heavy metal pollution on some soil-biological parameters in the alluvium of the Litavka river
2001
Mikanova, O. | Kubat, J. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic)) | Mikhailovskaya, N. | Voeroes, I. | Biro, B.
The soils most polluted by hazardous elements are probably alluvial soils. One of them is the alluvium of the Litavka river. The heavy metal content was much higher in some cases than the treshold values, allowed by the Czech standards. There was a decreased metal content found in general, along the river and with the distance from the pollution source. Metal content in the plants was reflected somehow the soil pollution level of the selected sites. Values of the heavy metal concentrations in the shoots were generally significantly lower than those in the roots for all investigated metals in this study. The effect of soil contamination on the soil microbial parameters is presented. An especially high number of the total countable bacteria was found at the lowest polluted sites. Their amount also decreased with distance of pollution site. Number of the spore-forming bacteria and oligotrophic bacteria has shown the same tendency. The results of the enzyme activity are presented. The lowest activity of dehydrogenases was found at sites where the concentration of pollutants was found to be the highest. Significant inhibition of amylase activity was observed only at the highest soil contamination level. Among the soil enzymes investigated, the invertase activity proved to be the most sensitive indicator of the soil pollution. The highest activity was found at sites, which are representing a relatively clean (unpolluted) area. The colonisation rates of the representing grass types by the arbuscular mycorrhizal fungi are shown.
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