Modelling carbon dynamics of boreal forest ecosystems using the Canadian land surface scheme

摘要: The ecosystem carbon (C) and nitrogen (N) simulations recently implemented in the Canadian Land Surface Scheme (CLASS) are presented. main calculations include plant photosynthesis, autotrophic respiration, root N uptake, litterfall, growth, soil heterotrophic respiration. Model experiments made on two boreal forest ecosystems, deciduous (aspen) conifers (black spruce). Simulated plant, soil, CO2 exchanges analysed half-hourly, daily, annual time scales compared with tower eddy correlation flux measurements estimates from various authors. Modeled daily exchange explained86% 54%, respectively, of observed variance correlationflux at aspen site black spruce site. Annual results show that was simulated as a C sink both 1994 (+164 g Cm−2) 1996 (+142 m−2), wassimulated (+39 m−2) 1995 (+25 Cm−2), but source (–27 m−2).