Do the volume/age curves used as input for the CBM-CFS3 have to represent merchantable volume, and which should I use, gross merchantable volume curves or net?
The CBM-CFS3 calculates biomass components from merchantable volume. Calculations are done using a national system of volume-to-biomass estimation models developed as part of Canada’s national forest inventory (Boudewyn et al. 2007). Users modeling forests in British Columbia should use net merchantable volume curves, while users modeling forests in all other Canadian provinces and territories should use gross merchantable volume curves. The difference in curve type requirements between British Columbia and the rest of Canada is due to differences in the way merchantable volume was handled in the estimation models developed for Canada’s national forest inventory. Standard provincial and territorial merchantability criteria are assumed by the volume-to-biomass estimation models that are built into CBM-CFS3.
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