Features The CO2FIX model is developed under the Carbon Sequestration and Sustainable Forest Management (CASFOR) project as an inter-institutional collaboration involving ALTERRA, the Netherlands; The Instituto de Ecologia of University of Mexico, Mexico; The Centro Agronomico Tropical de Investigation y Ensenanza (CATIE), Costa Rica and European Forest Institute, Finland. The version CO2FIX V 3.1 is a simple carbon bookkeeping model that consists of six modules, one each for the following:


• Wood products

Bioenergy • Carbon accounting Financial

The biomass module converts volumetric net annual increment data with the help of additional parameters, described in the following sections, to annual carbon stocks in the biomass pool. In the soil module, decomposition of litter and harvest residues is simulated using basic information on climate and litter quality. The fate of the harvested carbon is determined in the wood products module, using parameters like processing efficiency, product longevity and recycling. In the bioenergy module, discarded products or by-products from the product module can be used to generate bioenergy, using different technologies. The carbon accounting module keeps track of all fluxes to and from the atmosphere and determines the effects of the chosen scenarios using different approaches to carbon accounting. The financial module uses costs of and revenues from management interventions to determine the financial profitability of different scenarios.

CO2FIX is an easy-to-use model, which simulates stocks and fluxes of carbon in trees, soil, and - in case of a managed forest - the wood products as well as costs and revenues and carbon credits that can be earned under different accounting systems. Stocks, fluxes, costs, revenues and carbon credits are simulated on a hectare scale with a time step of 1 year. The basic input into the model is the volume of stem growth (from the yield tables or allometric equations or research studies) and parameters on the allocation of that volume or biomass to other plant components such as leaves, branches and roots. Carbon stocks in the living biomass are calculated as the balance between growth and loss (from turnover, mortality and harvest).

Application The CO2FIX model can be used for estimating the following outputs for a single species or multiple species, forest or plantation and agroforestry systems:

• Carbon stock changes in above-ground biomass

• Carbon stock changes in below-ground biomass

• Carbon stock changes in deadwood and litter

• Changes in stock of organic carbon in soil

The model also provides outputs on wood products as well as financial parameters and can be used for estimating changes in stocks of carbon in biomass and soil for

• Forest sector mitigation projects such as afforestation and reforestation

• Bioenergy mitigation projects

• Plantations of industrial roundwood or fuelwood

• Estimation of carbon credits in CDM projects

• Carbon inventory as a component of the national greenhouse gas inventory

The model is available free of charge (more detailed information on CO2FIX model is available at

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