Effects of elevated CO2 on photosynthetic traits of native and invasive C3 and C4 grasses.

Both CO 2 and CO 2 x species were weakly significant (Table 2 ), with C/N tending to increase under elevated CO 2 , but more for some species than others.

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We detected marginally significant increases in shoot biomass with increases in CO 2 , but the lack of CO 2 x species interaction suggests that the increases were similar for C 3 and C 4 grasses.

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