Известия Томского политехнического университета: Инжиниринг георесурсов (Sep 2017)
Microelements in soils of forest-steppe sequent series in central part of Tobol-Ishim interfluve
Abstract
The relevance of the research. Features of distribution and accumulation of trace elements including heavy metals in soils of agricultural landscapes is one of the most important directions of research in soil science, agricultural chemistry and geoecology. These studies have a high relevance for the southern part of Tyumen region which is characterized by a strong agricultural specialization. Exploration of main features and factors of trace elements distribution in soils of agricultural landscapes can be important for the complex ecological and geochemical assessment of the territory, the refinement of the regional background levels of pollutants in soils, for development of special measures aimed for reduction of environmental risks and improvement of the quality of agricultural products. The main aim of the study is to analyze the main geochemical features of distribution and accumulation of several trace elements (Ti, Cr, Mn, Ni, Co Cu, Zn, Pb, Sr) in soils of agricultural landscapes located within the forest-steppe zone of Tobol-Ishim interfluve, depending on the differences in particle size distribution, humus content, pH values and position in the relief. The methods used in study: field soil and landscape-geochemical studies, determination of pH values in soil-water suspension, particle size distribution analysis using pyrophosphate method (with a microprobe analyzer), definition of microelements total concentrations using TXRF method, determination of humus content by the Tyurin method, statistical processing of the data. The results. The author has investigated the content and distribution of Ti, Cr, Mn, Ni, Co Cu, Zn, Pb, and Sr in soils of agricultural landscapes for the territory of Tobol-Ishim interfluve. The data may indicate that soils of the central part of Tobol-Ishim interfluve are enriched in Cu, Pb, Co and depleted in Ni, Zn, Sr, Mn compared to the average content in soils and soil-forming rocks of the south of Western Siberia. It was revealed that soils of the plot, despite the provision in relief, are low-contrast in particle size distribution, and this soil attribute has virtually no effect on the distribution of trace elements.
