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Abundance of microorganisms and their communities’ structure in disturbed peatlands characterized by different chemical properties and plants cover were studied. Naturally regenerating four disturbed peatlands from different regions of Lithuania were selected for the investigation. The aim of the study was to investigate invasive moss Campylopus introflexus cover effect on microbial communities. The peat under Eriophorum angustifolium, Polytrichum strictum and bare peat were sampled for the comparison. The abundance of microorganisms in sampling plots depends on the content of total nitrogen, potassium, soil organic matter and pH as well as on growing plants. In the peat under C. introflexus, the number of ammonifying and mineral N assimilating bacteria was significantly lower in comparison with other plants or bare peat. The results on fungi abundance in peat under C. introflexus allow to predict that the distribution of moss doesn‘t affect negatively the development of fungi. A total of 236 fungal strains belonging to 21 genera were isolated from the studied peat samples. Species from the Penicillium, Trichoderma and Mortierella genera dominated among them. The structure of microbial communities varied in separate peatlands and under various plants. However, all examined microorganism communities seemed to be able adapted to organic matter degradation.
The impact of various technological means (addition of NPK, sewage sludge, and biopreparation) on oil product degradation was studied ex situ in biodegradation sites. The degradation degree of oil products depended on pollutant concentration and addition of fertilizers. The succession of microorganisms during biodegradation process in polluted soil was ascertained. The addition of NPK stimulated the growth of ammonifying bacteria and fungi, while sewage sludge promoted the growth of ammonificators and yeasts but suppressed fungi. The increase of OO bacteria positively correlated with the abundance of heterotrophic bacteria, while the amounts of OO yeast and fungi correlated negatively. It was demonstrated that sewage sludge is a suitable organic fertilizer for polluted soil bioremediation and, moreover, in this way the problem of this industrial waste utilization could be solved as well.
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