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CBM CFS3 is a carbon accounting model for forest ecosystems. It calculates carbon stocks and stock changes over time. The model can take a variety of inputs such as species, yield curves and disturbance types (forest fire, logging, etc.) and output multiple simulations for comparison. The multiple output functionality allows for an easy comparison of baseline versus differing management strategies to see the relative impacts on carbon, therefore allowing forest managers avenues to maximize carbon sequestration. 2009. Ecological Modelling 220(4): 480 504.

Required Inputs these are read in as TXT, XLS or MDB files:

Age Classes information identifying age classes and age class size

Disturbance Types identifies disturbance and management activities (fire, clearcut, insects, etc.)

Classifiers and Values describes forest type, such as leading species, site quality, crown closure, etc.

Inventory this is the stand specific data, which points to the ‘Classifiers and Values’ classifiers and includes data such as stand age,
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area (ha), and disturbance history

Yields contains projected merchantable volume (m3/ha) per stand type

Transition Rules defines the transition per stand type after a disturbance (for example, after logging a stand of Douglas fir, it is replanted with Lodgepole pine).

Disturbance Events defines disturbances to occur per stand type

CBM CFS3 outputs both graphic and tabular data. As of version 1.2, there are no spatial capabilities, but that should change with the next release (the model will be spatialised by carrying a unique per stand polygon ID though from input to output).

Difficulties or Problems for SGRC to implement model as a web tool:

Interactive CBM CFS3 as it exists now requires a large amount of interaction, even after the input files have been loaded. This includes: mapping classifiers from input files to model classifiers, forcing a simulation to run, managing results to be able to view simulation results.

Complicated with a 445 page User Guide and almost 250 pages of tutorials, it takes a little while to get up to speed on this model.

Input files while input files can apparently be in text, MS Excel or MS Access formats, CBM CFS3 can crash easily if formatting isn’t exact.

The Canadian Forest Service provides 3 day training seminars from time to time. Recommendation is to go through the tutorials provided with the model download (put aside a few days for this they are time consuming). The model can represent nonforest lands and each can be assigned a soil type with modifiable, default initial soil carbon values, but only for the purpose of immediate conversion to forest via afforestation. Reliability in carbon stocks and stock change results for nonforest lands decline rapidly if the user does not convert them immediately to forest in a simulation,
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as the model will assume there are no biomass carbon inputs to the soil (which may or may not reflect reality).