ASP Colloquium 2007 Monday June 4, 2007 CENTURY TUTORIAL

1. ASP Colloquium 2007Monday June 4, 2007CENTURY TUTORIAL Tutorial leaders: Bill Parton and Cindy Keough

2. CENTURY • Brief overview • Beginning • Components

3. CENTURY generalized plant-soil ecosystem model that simulates: plant production, soil carbon dynamics, soil nutrient dynamics, and soil water and temperature.

4. Overall flow diagram for the CENTURY model.

5. CENTURY • Brief overview • Beginning • Components • SOM pools: active, slow and passive • Disturbances • Uses/applications (crops, grasslands, forests) • Trial runs

6. Data requirements for running the Century model You will need to create a parameterization for you site. Site specific information that is required for a CENTURY run includes: • monthly precipitation in centimeters • monthly mean minimum temperatures in degrees Celsius • monthly mean maximum temperatures in degrees Celsius • site latitude and longitude • % sand, silt, and clay in top 20 cm layer of mineral soil • bulk density of the top 20 cm layer of soil (g/cm^3) • rooting depth and root distribution of the vegetation (in cm) • best estimate of annual wet and dry N deposition • C in the soil organic matter in the top 20 cm of soil • N in the soil organic matter in the top 20 cm of soil

7. Data requirements for running the Century model Determine the type of system you will be simulating: • grassland/cropping • forest • savanna You will need to know at least the following about the vegetation growing at your site in order to parameterize the model: • productivity of vegetation (gC/m^2 per year or growing season) • C:N ratio of aboveground and belowground vegetation if modeling a crop/grassland or split into leaves, branches, large wood, fine roots, and coarse roots for a forested system • root to shoot ratio of vegetation if modeling a crop/grassland or % allocation of production to leaves, branches, large wood, fine roots, and coarse roots for a forested system • lignin content of vegetation, aboveground and belowground for grasses; split into leaves, branches, large wood, fine roots, and coarse roots for a forested system

8. TRIAL RUNS: Running the Century model The usual sequence of events: • 1. Create the desired parameterizations in the *.100 files using FILE100. • 2. Use EVENT100 to create the schedule file for your simulation. • 3. Run the CENTURY simulation. • 4. Use LIST100 to extract the desired output from the binary output file produced by your CENTURY run.

9. CENTURY model environment.

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12. CENTURY • Brief overview • Beginning • Components • SOM pools: active, slow and passive • Disturbances • Uses/applications • Trial runs • Current state (DAYCENT)

13. CENTURY It began with soil managing, Today deals with C-sequestering. SOM turnover is the key, Acting fast, slow, and passively; There’s disturbance and productivity, Soil nutrients and basic hydrology. That’s a bit on CENTURY Thanks to Bill and Cindy. web site: http://www.nrel.colostate.edu/projects/century