Table S2.
Input data used in models for the baseline and projected ecosystem C stock simulations
| Data category | Data type | Data source/reference | Model | ||
| LGAT | EDCM | CENTURY | |||
| LULC | LULC classes | USGS NLCD 1992, 1997, 2001, 2006 | x | x | |
| Climate | Monthly minimum and maximum temperature, monthly precipitation | PRISM Climate Group—baseline; CFS—projected (25) | x | x | |
| CO2 fertilization | CO2 monthly concentration | IPCC (36) | x | x | |
| Atmospheric N | Annual N deposition distribution | Dentener (37) | x | x | |
| Soil | Total sand | SSURGO (USDA NRCS) | x | x | |
| Total clay | x | x | |||
| Total silt | x | x | |||
| Soil thickness | x | ||||
| Soil organic carbon | x | x | x | ||
| Available water capacity | x | ||||
| DB 0.33 bar H2O | x | ||||
| Forest | Biomass | USDA Forest Service | x | ||
| Stand age | USDA Forest Service; USGS Land Cover Trends Project | x | x | x | |
| FIA species growth curves, height, diameter, biomass measurements | USDA Forest Service | x | |||
| Timber product output | USDA RPA TPO | x | |||
| Crops | Derived crop type | Schmidt et al. (34) | x | x | x |
| USDA crop yield table | USDA NASS | x | x | ||
| USDA fertilization table | USDA ERS | x | x | ||
| USDA manure table | USDA ERS | x | x | ||
| CTIC tillage table | CTIC; USDA ERS | x | x | ||
| Management | Derived manure | Schmidt et al. (34) | x | x | x |
| Derived tillage | Schmidt et al. (34) | x | x | x | |
| Derived fertilizer | Schmidt et al. (34) | x | x | x | |
| Irrigation | USGS Irrigated Agr. Dataset | x | x | x | |
| Nitrogen deposition 1993 and 2050 | Dentener (37) | x | x | ||
| Remote sensing | NPP | Zhao et al. (30) | x | x | |
| Fire | Fire severity | Eidenshink et al. (38) | x | x | |
| Reference | State and county FIPS | US Census Bureau | x | x | x |
| Initial condition | Forest litter biomass | Spreadsheet model | x | x | |
| Aboveground live biomass | Spreadsheet model | x | x | ||
| Belowground live biomass | Spreadsheet model | x | x | ||
| Deadwood biomass | Spreadsheet model | x | x | ||
| Standing wood biomass | Spreadsheet model | x | x | ||
Note: Most of the input data have a 250-m spatial resolution and variable temporal characteristics, even though most data cover the first decade of the 21st century. Db 0.33 bar H2O, the oven-dry weight of the less than 2-mm soil material per unit volume of soil at a water tension of 1/3 bar (as used in the SSURGO database). CTIC, Conservation Technology Information Center; EDCM, Erosion-Deposition C Model; ERS, Economic Research Service; FIA, USDA Forest Service’s Forest Inventory and Analysis; FIPS, Federal Information Processing Standard; LP DAAC, Land Processes Active Archive Center; LULC, land use and land cover; MODIS, moderate resolution imaging spectrometer on board NASA’s Terra satellite; NASA, National Aeronautics and Space Administration; NASS, National Agricultural Statistics service; NPP, net primary productivity; NRCS, USDA’s Natural Resources Conservation Service; NTSG, Numerical Terradynamic Simulation Group; PRISM, parameter-elevation regressions on independent slopes model; RPA, US Forest Service Forest and Rangeland Renewable Resources Planning Act of 1974; SSURGO, Soil Survey Geographic Database; TPO, timber product output; USDA, US Department of Agriculture.