Modeling of the net ecosystem exchange, gross primary production and ecosystem respiration for peatland ecosystems of West Siberia

Observed and simulated carbon dioxide fluxes in oligotrophic peatlands of West Siberia are discussed. Net ecosystem exchange, gross primary production and ecosystem respiration were measured at ridge-hollow complex at South Taiga zone (Bakchar bog – field sataion “Vasjuganie”) and Middle Taiga zone (field station “Mukhrino”). The model of net ecosystem exchange was used to study the influence of different environmental factors and to calculate daily and growing season carbon budget for oligotrophic bog. The model uses air and soil temperature, incoming photosynthetically active radiation, and leaf area index as the explanatory factors for gross primary production, heterotrophic and autotrophic respiration. The model coefficients were calibrated using data collected by automated soil CO₂ flux system with clear long-term chamber.  The studied ecosystems are a sink of carbon according to modelling and observation results.