摘要：Ecosystem modelling is a useful tool for gaining insight and quantifying the carbon exchange between the atmosphere and terrestrial ecosystems. This study examines how well Forest-DNDC (a process-based biogeochemical model for forests/wetlands) estimates carbon dioxide (CO2) fluxes from Canadian boreal forests and peatlands. We also evaluate the appropriateness in using Forest-DNDC to establish the baseline conditions of CO2 fluxes before land-use change. Two mature black spruce forests and two ombrotrophic bogs were selected for comparisons between modelled and measured CO2 fluxes. Two vegetation parameters in Forest-DNDC were optimized, and a hydrologic parameter was calibrated for the CO2 flux simulations. The daily GPP (gross primary production) and ER (ecosystem respiration) simulations from all the study sites were in close agreement with the observations (r2 for GPP and ER equal 0.79–0.86 and 0.86–0.87, respectively). The results of this study show that Forest-DNDC is useful in establishing baseline exchanges for boreal ecosystems prior to land-use change.
