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Biological Activity of Leached Chernozem under Oil and Sodium Chloride Pollution and the Effect of Treatment with Halotolerant Oil-Destructing Bacteria
Soil contamination with oil is often accompanied by pollution with oil-field wastewater containing a significant amount of NaCl, which enhances the negative impact of hydrocarbons on soil, plants, and soil microbiota. Therefore, for biotechnological purification of soils subjected to such combined p...
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Published in: | Eurasian soil science 2023, Vol.56 (1), p.75-86 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | Soil contamination with oil is often accompanied by pollution with oil-field wastewater containing a significant amount of NaCl, which enhances the negative impact of hydrocarbons on soil, plants, and soil microbiota. Therefore, for biotechnological purification of soils subjected to such combined pollution, hydrocarbon-oxidizing bacteria resistant to salinity should be used. In a model experiment, the effect of artificial pollution with oil (5%) and sodium chloride (1 and 3%) and their combinations, as well as that of bioremediation using halotolerant hydrocarbon-oxidizing bacteria on the biological activity of leached chernozem (Luvic Chernozem) were studied. The soil contamination with all types of pollutants increased its phytotoxicity, whereas bacterization had a positive effect on this indicator neither in the presence of NaCl nor in case of combined pollution. However, it mitigated toxicity of oil-containing soil to plants. Actinomycetes were the most sensitive to the presence of oil and/or NaCl; their number in contaminated soils decreased by one–two orders of magnitude. The application of microorganisms intensified the decomposition of hydrocarbons, in particular, by 10.5–31.8% in the soil with combined oil and salt pollution. The presence of pollutants suppressed the activity of soil enzymes. Bacterization favored an increase in the catalase activity of the oil-containing soil, restored the urease activity, and intensified the invertase activity upon the combined effect of pollutants. |
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ISSN: | 1064-2293 1556-195X |
DOI: | 10.1134/S1064229322601664 |