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gcb12039-sup-0001-FigureS1.TIFimage/TIF1067KFigure S1. Correlation of coarse root biomass (g m−2) determined in 2007 using two different techniques, 30 × 30 × 30 cm pits, and 8 cm diameter auger coring to a depth of 30 cm. Filled circular symbols denote ambient CO2 plots and open circular symbols denote elevated CO2 treatments.

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