The number of ecological and trophic groups of microorganisms in Yazivske sulfur deposit

Abstract

The quantity of major ecological-trophic groups of microorganisms on the territory of Yazivske sulfur deposit was studied. It was established that the quantity of all ecological-trophic groups of aerobic microorganisms in the soil at a depth of 50 cm was decreases compared to the quantity of microorganisms in the soil at a depth of 30 cm. The smallest quantity of bacteria of all ecological-trophic groups was in the water. It was established that acidophilic colorless sulfur bacteria dominated in all the samples of soil and water of Yazivske sulfur deposit. Their quantity in the sediment and soil was (12.9±0.3)·1011 — (6±0.3)·1011 CFU/g ADS (CFU/g ADS — colony forming units per gram of absolutely dry soil), respectively. Quantity of neutrophilic colourless sulfur bacteria was (9.6±0.5)·104 — (1.2±0.01)·105 CFU/g ADS. The quantity of anaerobic microorganisms, such as denitrifying, sulfate- and sulfur-reducing bacteria, was the lowest. The quantity of sulfur-reducing bacteria in the soil was (1.15±0.2)·104 — (8.1±0.3)·104 CFU/g ADS, in sediment — (3.5±0.22)·103 CFU/g ADS, in the water they were in a small quantity — 14 CFU/ml. The quantity of sulfate-reducing bacteria in soil and sludge was (1.9±0.05)·103 — (3.3±0.2)·103 CFU/g ADS. The quantity of microscopical fungi in soil and sludge did not exceed the quantity of fungi in the control variant. The total quantity of saprophytes, nitrifiers, oligonitrophylls and aerobic cellulose degrading bacteria in studied samples was higher than in control. pH of all soil, sediment and water samples of Yazivske sulfur deposit was poorly alkaline (7.51 to 8.3)