SGS-LTER CO2 Elevation Study: Biomass, by species, from ambient and elevated CO2 OTC's and unchambered controls on the Central Plains Experimental Range, Nunn, Colorado, USA 1997 - 2001

Above-ground plant material was harvested, by species, in July (PSC) in five years from ambient and elevated CO2 Open-top-chambers, and unchambered controls. There was a small difference in species composition, in the plots, in 1996; prior to any CO2 treatment; this data should be used as a covariate in looking at subsequent years. There was a consistent increase in plant productivity in the elevated CO2 chambers, primarily in the C3 grass group.