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DayCent Biofuel Modelling Efforts

DayCent Biofuel Modelling Efforts. Bill Parton Steve Del Grosso Steve Ogle. Outline. DayCent model description Model Testing N 2 O Soil C Plant production Biofuel validation sites Biofuel model results Conclusion. DAYCENT MODEL. S, R h. S = Soil Type V= Veg Type L = Land Use.

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DayCent Biofuel Modelling Efforts

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  1. DayCent Biofuel Modelling Efforts Bill Parton Steve Del Grosso Steve Ogle

  2. Outline • DayCent model description • Model Testing • N2O • Soil C • Plant production • Biofuel validation sites • Biofuel model results • Conclusion

  3. DAYCENT MODEL S, Rh S = Soil Type V= Veg Type L = Land Use CH4 Uptake Den V Nit N Uptake N inputs NPP PPT, V, L CO2 Stom H2O soil Tsoil S C:N ET NO3- N GAS SOM NH4+ 0-1 cm 0-1 cm 0-1 cm ACTIVE 0.5-1 yr DEAD PLANT MATERIAL 1-4 cm 1-4 cm 1-4 cm 0-15 cm N Min PLANT COMPONENTS 4-15 cm 4-15 cm 4-15 cm SLOW 10-50 yr STRUCTURAL Rh 15-30 cm 15-30 cm 15-30 cm CO2 LEAVES etc. etc. etc. METABOLIC PASSIVE 1000-5000 yr S C:N FINE ROOTS Decomp Decomp S S Rh BRANCHES Death LARGE WOOD C:N CO2 LARGE ROOTS Parton, et al. 1998 Kelly et al. 2000 Del Grosso et al. 2001

  4. Model Testing • Agricultural Experiment Sites • N2O • Soil C • Crop yields • Agricultural Census

  5. Corn Grain Yields (21 Counties)

  6. Biofuel Model Testing Sites • Penn State Biofuel Plots • Corn, soybean, alfalfa, poplar • Kellogg Biological Station Biofuel Plots • Poplar • Nebraska Biofuel Plots • Switchgrass • Data Sets • N2O • Soil C and N • Crop yields

  7. Observed and DAYCENT N2O for Biofuel Cropping Systems in Pennsylvania

  8. Cropping Systems • Switchgrass • Reed Canarygrass • Corn-Soybean – (CT) • Corn-Soybean – (NT) • Corn-Soybean – ALFALFA (CT) • Corn-Soybean – ALFALFA (NT) • Hybrid Poplar

  9. Greenhouse gas sources and sinks from bioenergy cropping systems in the near-term Adler, P.R., S.J. Del Grosso, and W.J. Parton. 2007. Life cycle assessment of net greenhouse gas flux for bioenergy cropping systems. Ecol. Appl. 17(3):675–691.

  10. Adler, P.R., S.J. Del Grosso, and W.J. Parton. 2007. Life cycle assessment of net greenhouse gas flux for bioenergy cropping systems. Ecol. Appl. 17(3):675–691.

  11. Grassland/Degraded Land

  12. Conclusions • Extensive data sets exist to test biofuel cropping models • Crop yields • Soil C and N • Trace gas fluxes • DayCent model has been tested for biofuel crops • Pennsylvania • Michigan • Nebraska • Current land use greatly impacts net greenhouse gas budgets of biofuel crops • CRP and grassland conversions

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