почвенные ферменты

Biodiagnosis of Soil with a Low Level of Anthropogenic Impact (with the typical Urban Settlement Stepnoe, Saratov Region, as an example)

Authors: Pleshakova Y. V., Ngun C. T., Reshetnikov M. V.

With the urban-type settlement Stepnoe as an example, biodiagnosis of the soil of a settlement with low technogenic impact was conducted. In the course of our work, 30 soil samples were plated onto solid nutrition media to evaluate the following: the total numbers of heterotrophic microorganisms - on meat peptone agar, the numbers of hydrocarbon-oxidizing and iron-oxidizing microorganisms - on their corresponding selective media, and the activity of several soil redox and hydrolytic enzymes (dehydro-genases, catalases, peroxidases, and invertases) were also studied.

SOIL STATUS ASSESSMENT IN URBAN AREAS BY CHEMICAL AND ENVIRONMENTAL TOXICOLOGICAL METHODS

Authors: Olkova A. S., Berezin G. I., Ashikhmina T. Y.

The ecological status of soils in an urbosystem was assessed in terms of the total content of heavy metals, their mobile forms, petroleum products, integrated toxicity, and soil catalase activity. Parts of the functional transport areas of the city have turned out to be the most disadvantaged areas. A tendency of suppression of the ciliate motor activity and the growth indicators of watercress, reduction of the catalase activity in urban soils are observed.