Methane and carbon dioxide fluxes correlation according to automatic chamber observations at the Mukhrino bog ridge and hollow complex

Aim: To study the dynamics of specific greenhouse gas (CO2 and CH4) fluxes in a ridge-and-moss oligotrophic bog complex in the middle taiga subzone of Western Siberia taking into account their spatial heterogeneity under the influence of environmental factors, to reveal the degree of influence of meteorological parameters on greenhouse gas fluxes, and to establish quantitative relationships between the observed fluxes of carbon dioxide and methane. Methods: Greenhouse gas fluxes were measured using the chamber automatic monitoring system with eight transparent chambers and CO₂, CH₄ and H₂O gas analyzer. Results: The mean values of CO2 and CH4 fluxes from bog surface were obtained; differences in the functioning of the ridge and the hollow are shown: median values of CO2 fluxes indicate a greater uptake on the ridge (-74.4 mgCO2/m2/h) than on the hollow (-52.7 mgCO2/m2/h); methane fluxes on the ridge (0.08 mgCH4/m2/h) are on average 20 times lower than on the hollow (2.76 mgCH4/m2/h). Correlation of greenhouse gas fluxes with environmental factors were revealed: the highest correlations were found with the intensity of incoming solar (r = -0.84 ÷ -0.91) and photosynthetically active radiation (r = -0.85 ÷ -0.92), air temperature (r = -0.51 ÷ -0.63) and relative air humidity (r = +0.56 ÷ +0.62). Conclusions: Correlations between specific greenhouse gas fluxes were studied based on spatial and temporal flux variability data. Correlations between greenhouse gas fluxes are different at night and daytime, which is directly related to environmental factors.