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gcb2529-sup-0001-FigureS1.EPSimage/EPS249KFigure S1. Aboveground biomass production of perennial grasses (open circles) and forbs (open squares) grown in tallgrass prairie assemblages and of the two growth forms combined (total; closed circles) averaged across a subambient to elevated CO2 gradient. Mean values (±SE) of production are shown for each of three soil types (a–c) during the pre-treatment year (2005) and 4 years of CO2 exposure.
gcb2529-sup-0002-FigureS2.EPSimage/EPS287KFigure S2. Aboveground biomass production of tallgrass prairie assemblages (total; circles) and of dominant grass species [Bouteloua (a) or Sorghastrum (b, c); squares] averaged across subambient (sub; open symbols) or elevated CO2 levels (ele; closed symbols). Means (±SE) of production are shown for each of three soil types (a–c) during the pre-treatment year (2005) and 4 years of CO2 treatment.
gcb2529-sup-0003-TableS1.docxWord document17KTable S1. Statistically-significant regression analyses relating aboveground biomass production of dominant C4 grasses, Bouteloua curtipendula and Sorghastrum nutans, to growth CO2 concentration. Linear (y = ax + b), quadratic (y = ax + cx2 + b), or exponential (y = b × eax) functions were fit to relationships between aboveground production (y; g biomass m−2) and CO2 concentration (x; 250–500 μmol mol−1) for the years 2006 through 2009. There were no significant relationships between production and CO2 for the Mollisol or Vertisol soils in 2006 (P = 0.66–0.97) or for Bouteloua on the Vertisol (P = 0.53–0.74).

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