The Carbon Budget Model of the Canadian Forest Sector (CBM––CFS2) is a framework for the dynamic accounting of carbon pools and fluxes in Canada’’s forest ecosystems and the forest product sector. The model structure, assumptions, and supporting databases are described. The model has been applied to estimate net ecosystem carbon fluxes for Canada’’s 404 Mha forest area for the period 1920––1989. Changes in disturbance regimes have affected the forest age class structure and increased the average forest age during the period 1920––1979. The resulting changes in dead organic matter and biomass carbon during this period were estimated with the model. In the last decade of the analysis, large increases in disturbances, primarily fire and insect damage, have resulted in a reduction in ecosystem carbon storage. The estimates of biomass pool sizes obtained are consistent with those of other studies, while dead organic matter carbon pool estimates remain somewhat uncertain. Sensitivity analysis of several sources of uncertainty indicate that the pattern of net changes in ecosystem carbon pools over the 70-yr period was hardly affected and that the numerical estimates changed by <15%%.
Ecological Applications – Ecological Society of America
Published: May 1, 1999
Keywords: boreal forest ; Canada ; carbon ; carbon budget model ; CBM––CFS2 ; climate change ; decomposition ; disturbance ; fire ; harvesting ; insects ; soil
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