Moisture Conditions during the Growing Season Influence the Soil CO Flows in Middle Taiga Pine Forests of the Middle Reaches of the Yenisei River

Forest ecosystems of the boreal zone are the most vulnerable areas in terms of current climate change. The CO fluxes from the soil surface can also be significantly modified by abrupt changes in environmental conditions. The main objective of this study was to track the response of emission and exchange fluxes of CO from the soil surface in middle taiga ecosystems to changes in moisture conditions during heavy precipitation. The research method chosen was direct chamber measurement during the frost-free period of the year were. It was found that for pine stands with different ground cover, microclimatic characteristics make a significant contribution to the CO flow formation. The CO pulses in the lichen-pine forest ecosystem throughout the season manifested in the increased exchange flow by 3-4 times on average. In the green-moss-pine forest, the magnitude of CO pulses varies significantly during the season, reaching a maximum in the middle of the growing season: with a 5 times increase in the initial rates of CO flows. With an increase in the precipitation amount in the lichen-pine forest, an intensification of production activity by 12% was also observed. At the same time, the optimal soil moisture for maximising the CO production for the lichen-pine forest is on average 33%, and for the green moss pine forest it is about 46%.