Fig. 3From: Effects of elevated CO2 on photosynthetic traits of native and invasive C3 and C4 grassesThe effect of CO2 concentration (ppm), photosynthetic mechanism, and invasive status on a tillers, b shoot biomass, and c root biomass (mean ± SE). DM dry mass. Asterisks represent the degree of significance between invasive status: †P < 0.10, *P < 0.05, **P < 0.01, ***P < 0.001Back to article page