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Accession Number DE2012-1048302
Title ForCent Model Development and Testing using the Enriched Background Isotope Study Experiment.
Publication Date 2011
Media Count 47p
Personal Author C. Swanston M. Torn P. J. Hanson R. Kelly S. E. Trumbore W. Riley W. J. Parton
Abstract The ForCent forest ecosystem model was developed by making major revisions to the DayCent model including: (1) adding a humus organic pool, (2) incorporating a detailed root growth model, and (3) including plant phenological growth patterns. Observed plant production and soil respiration data from 1993 to 2000 were used to demonstrate that the ForCent model could accurately simulate ecosystem carbon dynamics for the Oak Ridge National Laboratory deciduous forest. A comparison of ForCent versus observed soil pool (sup 14)C signature ((Delta) (sup 14)C) data from the Enriched Background Isotope Study (sup 14)C experiment (1999-2006) shows that the model correctly simulates the temporal dynamics of the (sup 14)C label as it moved from the surface litter and roots into the mineral soil organic matter pools. ForCent model validation was performed by comparing the observed Enriched Background Isotope Study experimental data with simulated live and dead root biomass (Delta) (sup 14)C data, and with soil respiration (Delta) (sup 14)C (mineral soil, humus layer, leaf litter layer, and total soil respiration) data. Results show that the model correctly simulates the impact of the Enriched Background Isotope Study (sup 14)C experimental treatments on soil respiration (Delta) (sup 14)C values for the different soil organic matter pools. Model results suggest that a two-pool root growth model correctly represents root carbon dynamics and inputs to the soil. The model fitting process and sensitivity analysis exposed uncertainty in our estimates of the fraction of mineral soil in the slow and passive pools, dissolved organic carbon flux out of the litter layer into the mineral soil, and mixing of the humus layer into the mineral soil layer.
Keywords Biomass
Carbon
Ecosystems
Enriched Background Isotope Study
Forests
Humus
Oak Ridge National Laboratory
Organic matter
Production
Respiration
Sensitivity analysis
Soils
Testing
Validation

 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 48D - Forestry
57H - Ecology
68F - Radiation Pollution & Control
Corporate Author Lawrence Berkeley Lab., CA. Earth Sciences Div.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1304
Contract Number DE-AC02-05CH11231

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