County-level Cropland Carbon Estimates for the Contiguous U.S., 1990-2005


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