Plant communities on oil-contaminated ruderal sites in the Lopejská basin, district Brezno
2006
Ollerová, H., Technical University in Zvolen (Slovak Republic)
The paper deals with three plant communities with mono-dominance of the species Carex hirta, Melilotus albus and Calamagrostis epigejos, occurring within a territory affected by activity of an oil-processing plant, situated in the geomorphological unit Lopejská kotlina basin, in district Brezno. We describe their species composition, ecological conditions and taxonomic characteristics in relation to soil contents of non-polar extractable substances (NE) in localities loaded by hazardous waste material – acid oil residue. All the examined plant communities are developed under influence of oil substances in soil. In most cases, concentrations of non-polar extractable substances considerably exceed the maximum allowable limit – 500 mg per kg. In sites with dominance of Carex hirta species, the concentrations of oil substances range from 5,517.6 to 8,090.1 mg per kg. The plant community with dominance of Melilotus albus species is less influenced by waste materials in case of locality Predajná I. Much higher concentrations were found in locality No. 3 inside the oil processing plant area (2,125.5–3,822.5 mg per kg). The similar results were obtained for the community with dominance of species Calamagrostis epigejos. The highest content of oil substances in soil made 6,992.6 mg per kg. The NE concentrations in soil are so high, that the species Carex hirta, Melilotus albus and Calamagrostis epigejos can be considered as very resistant to pollution by oil substances.
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