Climatic Change

, Volume 55, Issue 4, pp 451–477

Modelling Carbon Dynamics of Boreal Forest Ecosystems Using the Canadian Land Surface Scheme


  • Shusen Wang
    • University of Alberta
  • Robert F. Grant
    • University of Alberta
  • Diana L. Verseghy
    • Meteorological Service of Canada
  • T. Andrew Black
    • University of British Columbia

DOI: 10.1023/A:1020780211008

Cite this article as:
Wang, S., Grant, R.F., Verseghy, D.L. et al. Climatic Change (2002) 55: 451. doi:10.1023/A:1020780211008


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

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© Kluwer Academic Publishers 2002