Dynamics of mire ecosystems of Siberia in the Holocene and paludification process at the present stage

The paper considers the Holocene paludification process in West Siberian Plain; peat increase for the entire Holocene according to radiocarbon dating of peat deposits. The comparison of results by peat accumulation activity with the climate of Western Siberia in the Holocene is carried out, and the forecast of the natural evolution of mires is given. To determine the contemporary accumulation rate and linear peat increment, we used the model of peat and carbon accumulation process, and the field studies of carbon balance parameters of oligotrophic bog catena as an example. The modern rates of carbon accumulation and the linear peat increment of some types of mires were determined. The field studies of carbon balance parameters on the example of oligotrophic bog catena showed, in years with different climatic conditions, the NPP values varied from 206 to 337 g Cm⁻² year⁻¹. Most of the carbon losses are the carbon dioxide emission (an average is 61.3 g Cm⁻² year⁻¹, or 23.5 % NPP). The carbon flux, determined by the model of the removal chemicals, is 3.0% NPP with a mean value 7.9 g Cm⁻² year⁻¹. The calculations of the carbon balance indicate the progression of the paludification process in the studied area.