Composition and sources of dissolved organic matter of bog waters in the Southern Taiga of Western Siberia Available to Purchase

The chemical composition of organic compounds and their sources in the snow cover, peat and bog waters of the oligotrophic site typical of the southern taiga of the Bakchar swamp (northeastern spurs of the Great Vasyugan Mire) are studied. It is shown that the formation of the composition of dissolved organic matter (DOM) of bog waters is due to compounds formed in the peat deposit and those falling with atmospheric precipitation, as well as components of bog plants. In addition, the composition of DOM is strongly influenced by seasonal fluctuations, i.e. amount of precipitation and air temperature. The maximum amount of DOM in bog waters is observed in early spring before the snow melting and at the end of summer, when the amount of precipitation decreases. Pentacyclic triterpenoids with a predominance of taraxerene prevail in the composition of DOM at this time of the year. The minimum content of DOM in bog waters is identified when the bog waters were diluted with actively melting snow and liquid atmospheric precipitation. The n-alkanes and fatty acids are the main groups in the composition of DOM at this period of the year.