РЕКОНСТРУКЦИЯ УСЛОВИЙ ФОРМИРОВАНИЯ ТОРФЯНОЙ ЗАЛЕЖИ НИЗИННОГО БОЛОТА НА ЮГЕ ТАЕЖНОЙ ЗОНЫ ЗАПАДНОЙ СИБИРИ

The paleoecological study of the peat deposit of the floodplain terrace eutrophic peatland located in south of the taiga zone of Western Siberia was carried out. The work is based on an integrated approach including the following methods: radiocarbon dating, macrofossil analysis, rhizopod analysis, humification degree and physico-chemical characteristics of humic acids of peats. Comparison of the results obtained by different methods allowed us to reconstruct the history of the development of floodplain terrace eutrophic peatland determined by the local hydrological, geomorphological and geochemical conditions on the background of climate change. At the first stage of development, the peatland was often flooded by the river, which provided additional introduction of mineral matters and followed by increased ash content of peat. Then the influence of the river had weakened, and the growth of the peat deposit was more determined by the factors of endogenous peat bog formation and the level of surface hydrological runoff. This led to the formation of peats with normal ash content; hygrophytic grasses were replaced with sedges and hypnum plant assemblages. The eutrophic peatland showed the highest sensitivity to climate change over the last 8500 years. It is confirmed with synchronous variations of surface wetness in different bogs of the study area.