County-level Estimates for Carbon Distribution in U.S. Croplands, 1990-2005 - Legend

The following legend describes the spreadsheet headings in terms of carbon flux or distribution. Units for all values are Mg C yr^-1. Megagram (Mg) = 10⁶ gram

Legend

NPP	—	Net primary productivity or net carbon uptake
AgB	—	Carbon in above-ground biomass
BgB	—	Carbon in below-ground biomass
Harvest	—	Carbon harvested and transported off site
Residue	—	Carbon remaining on the surface following harvest