Technosols or technogenic substrates contaminated by potentially toxic elements as a result of iron mining causes not only contamination of the surrounding ecosystem but may also lead to changes of the extent, abundance, structure and activity of soil microbial community. Microbial biomass were significantly inhibited mainly by exceeding limits of potentially toxic metals as arsenic (in the range of 343-511 mg/kg), copper (in the range of 7980-9227 mg/kg), manganese (in the range of 2417-2670 mg/kg), alkaline and strong alkaline pH conditions and minimal contents of organic nutrients. All of the 14 bacterial isolates, belonged to 4 bacterial phyla, Actinobacteria, Firmicutes; β- and γ-Proteobacteria. Thirteen genera and 20 species of microscopic filamentous fungi were recovered. The most frequently found species belonged to genera Aspergillus (A. clavatus, A. niger, A. flavus, A. versicolor, Aspergillus sp.) with the dominating A. niger in all samples, and Penicillium (P. canescens, P. chrysogenum, P. spinulosum, Penicillium sp.). Fungal plant pathogens occurred in all surface samples. These included Bjerkandera adustata, Bionectria ochloleuca with anamorph state Clonostachys pseudochloleuca, Lewia infectoria, Phoma macrostoma and Rhizoctonia sp.

Department of Analytical Chemistry Faculty of Natural Sciences Comenius University 842 15 Bratislava Slovak Republic

Department of Environmental Ecology Faculty of Natural Sciences Comenius University 842 15 Bratislava Slovak Republic

Department of Landscape Ecology Faculty of Natural Sciences Comenius University 842 15 Bratislava Slovak Republic

Department of Soil Science Faculty of Natural Sciences Comenius University 842 15 Bratislava Slovak Republic

Institut of Molecular Biology Slovak Academy of Sciences 845 51 Bratislava Slovak Republic

Institute of Environmental Engineering Faculty of Mining and Geology VŠB Technical University of Ostrava Czech Republic

Institute of Laboratory Research on Geomaterials Faculty of Natural Sciences Comenius University 842 15 Bratislava Slovak Republic

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