Известия Томского политехнического университета: Инжиниринг георесурсов (Mar 2018)
Changes of chemical composition of waters in east part of the Vasyugan mire (Western Siberia)
Abstract
Relevance. Studies of changes in chemical composition of mire waters is the important part of research of environment and climate changes at ecological monitoring at oil and gas exploration, limitation of anthropogenous influences on water objects and efficiency of estimation of contaminated lands reclamation. The aim of the research is to reveal the long-term and intraannual changes of chemical composition of mire waters in east part of the Vasyugan mire. Methods: landscape-geochemical and statistical methods, methods of definition of chemical composition of mire waters, thermodynamic calculations. Results and conclusions. The authors have analyzed the time changes in chemical composition of waters of east part of the Vasyugan mire (the Western Siberia, the Ob river basin, the Tomsk region) within the limits of three intramire ecosystems (mesotrophic border of ryam; ryam (Russian) - oligotrophic pine-dwarf-shrub-sphagnum raised bog; hollow-ridge complex - mire type which combines ridges and hollows). It is shown that for 2003-2017 there were no statistically significant changes of chemical composition of mire waters in active horizon of a peat deposit. Observable fluctuations of hydrochemical parameters are caused by variability of atmospheric humidifying which remains statistically constant in an annual section of the period of 1965-2016. Hydrochemical regime of mesotrophic border differs in the highest variability of total dissolved solids of mire waters and dependence on atmospheric precipitation value, and hydrochemical regime of ryam is characterized by the least influence of atmospheric precipitation. The common features of hydrochemical regime of all of three ecosystems is the certain reduction of mineralization during spring flood and increase in N-, P-, Si-substances and microelements in winter low water.
