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

Observed and simulated carbon dioxide fluxes in oligotrophic peatlands of Western Siberia are discussed. Net ecosystem exchange, gross primary production, and ecosystem respiration are measured at a ridge-hollow complex in the South Taiga zone (Bakchar bog – field station "Vasjuganie") and Middle Taiga zone (Mukhrino bog - field station "Mukhrino"). A model of net ecosystem exchange is used to study the influence of different environmental factors and to calculate daily the growing season carbon budget for an oligotrophic bog. The model uses the air and soil temperature, the incoming photosynthetically active radiation, and the leaf area index as the explanatory factors for gross primary production, heterotrophic and autotrophic respiration. The model coefficients are calibrated using data collected by an automated soil CO 2 flux system with a clear long-term chamber. The studied ecosystems are sinks of carbon according to modelling and observation results.