Forest Inventory Based Estimation Of Carbon Stocks And Flux In California Forests In 1990

Estimates of forest carbon stores and flux for California circa 1990 were modeled from forest inventory data in support of California's legislatively mandated greenhouse gas inventory. Reliable estimates of live-tree carbon stores and flux on timberlands outside of national forest could be calculated from periodic inventory data collected in the 1980s and 1990s; however, estimation of circa 1990 flux on national forests and forests other than timberland was problematic owing to a combination of changing inventory protocols and definitions and the lack of remeasurement data on those land categories. We estimate annual carbon flux on the 7.97 million acres of timberlands outside of national forests (which account for 24 percent of California's forest area and 28 percent of its live tree aboveground biomass) at 2.9 terragrams per year.

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This report describes the use of a well-established carbon budget model for the Canadian forest sector to investigate the carbon budget of Ontario's forest ecosystems. It first reviews the model and its components, then presents results of model runs using input data mainly based on a 1985 forest biomass inventory database. Model simulations begin in 1989 with simulated initial ecosystem conditions that are the endpoint of a 70-year retrospective model run for the period 1920-1989. Results are discussed with regard to forest age structure, forest carbon distribution & stocks, and ecosystem carbon fluxes. The final section includes discussion of the contribution of Ontario forest ecosystems to Canada's carbon budgets and recommendations for further research.

The Carbon Calculation Tool 2007, CCT2007.exe, is a computer application that reads publicly available forest inventory data collected by the USDA Forest Service's Forest Inventory and Analysis Program (FIA) and generates state-level annualized estimates of carbon stocks on forest land based on FORCARB2 estimators. Estimates can be recalculated as new inventory data become available. The input set of FIA data files available on the Internet (as well as some older inventory files used to fill in gaps) are summarized by the application, converted to carbon stocks, and saved as part of a state or substate level "survey summary" file. This is used to produce state-level and national tables with annualized carbon stocks and flux (or net stock change) beginning with the year 1990. This user's guide includes instructions for use, example data sets, and a discussion of methods and assumptions.

Also available via the World Wide Web.