HIGH PEATS AS THE INDICATOR OF CLIMATOLOGICAL AND ECOLOGICAL CHANGES OF ENVIRONMENT

Larina N.S., Larin S.I., Merkushina G.A., Tyumen State University, Russia

Abstract

There is an enormous amount of lakes and bogs and also peats in the area of the Tyumen region (Russia). It is worth noting that the part of high peats is small. In the process of peat formation the material is constantly accumulating, elements and substances that migrate inside the natural object are depositing. As a result, it can conduct layer-by-layer dating, appreciate biogeochemical situation in the different periods of time and the degree of both local and global human intervention.
The purpose of this research work is the study of some geochemical indexes dynamics in holocoen by chemical analysis and layer dating of peat deposit of high and low bogs located in the forest-steppe zone (the Tyumen region, Russia); reconstruction of climatological condition impact on peat formation; assessment of iron and manganese content dynamics including the last period of anthropogenic diffusion of elements. The object of investigation is peat samples collected layer-by-layer (step 3-5 cm) from deposits of three high peat and one low peat located in Priishimje. Such main geochemical indexes as ash content, pH, Eh and iron and manganese content have been defined. General geochemical indexes afford to separate geochemical peculiarities of peat formation and basic periods of their development.
In our vision, the proportion of iron and manganese content is very important. Accumulation of these metals is directly related to mire formation and also can be a factor of humidity change in the past.

Keywords: peat, climatological changes, accumulation, metals