Microbiological monitoring of anthropogenically transformed soils

Abstract

The article presents results of microbiological monitoring of artificial soils. These soils were formed in the process of reclaiming technical lignin in special drives of the Baikal Pulp and Paper Mill (Irkutsk region). The test drives are in Solzanskom landfill, which is located between the vil. Solzan and the r. Bol'shaja Osinovka south of Irkutsk - Ulan-Ude highway. Investigations were carried out in drives № 1, № 4, № 5, № 6. Soil samples were homogenized in a selected point on three levels. Evaluation of sludge lignin was conducted in accordance with generally accepted sanitary and microbiological methods of investigation of soils, using the integral index of general contamination of the soil. The research shows the role of aerobic and anaerobic microorganisms, bacteria and fungi in microbiocenosis. The degree of contamination of the soil is strong. The ratio of prokaryotic to eukaryotic microorganisms is 3:1 on the average. This suggests a significant role of bacterial forms in lignin biodegradation. The prevalence of the aerobic microorganisms over anaerobic ones shows that in the lower layers of sludge lignin biodegradation process is slow. The materials demonstrate that the methods of microbiological monitoring are proximate and provide a comprehensive assessment of the ecological status of the soil.