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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


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