Presented are the isolines maps for the distribution of inhomogeneous values of acid-alkaline medium and biochemical activity levels of soils in the industrial city of Bratsk in the settings of Eastern Siberia. The maps were constructed from point measurements in the geoinformation environment by the IDW Nearest Neighbors method. The soil biochemical activity was analyzed by using the proximate method according to T. V. Aristovskaya and M. V. Chugunova. It is shown that the activity of urban soils varies from strong to moderate. The soils with high activity occupy 75,3 % of the total area of the city. The acid-alkaline conditions of soils are transformed considerably toward the alkaline side. On the hole, the alkaline and highly alkaline soils occupy 96% of the territory. A high level of soil biochemical activity has been revealed. This study deals with the transformation of nitrogen-containing organic compounds leading to a loss of biogenic nitrogen by the soil.
In this paper, we discuss new experimental data on the soils from eastern coast of the Baikal natural territory. We provide description of the soils, also the acid-alkaline conditions (from pH 5.1 to 7.9) and humus content (from 0.1 to 13.8%) were determined. The degree of biological activity determined by express method per-mitted categorizing soils as moderately and weakly active. We revealed a noticeable (on Chaddock’s scale) relationship of this activity with acid-alkaline conditions (R2 = 0.52). The quantitative-qualitative characteris-tics of soil microbiocoenoses were studied in details, revealing a high diversity of the main systematic groups of organisms. Qualitatively, the fugal component was very diverse. The specific feature of soils was the absence of the most common microscopic fungus Aspergillus niger, which is characteristic for the other Siberian soils. The investigated soils were found to be epidemiologically safe.
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