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Fig. 5. Stomatal conductance vs. intercellular CO2 of Pascopyrum smithii and Boutleoua gracilis grown in open‐top chambers with ambient (360 µmol mol–1) and elevated (720 µmol mol–1) CO2 and in plots without chambers on the Colorado shortgrass steppe. Measurements made during May 1999. Data are means of three replications ± s.e. The CO2 treatment effect was not significant.
