Abstract
Agrostis capillaris L. 4 , Festuca vivipara L. and Poa alpina L. were grown in outdoor open-top chambers at either ambient (340 μmol mol -1 ) or elevated (680 μmol mol -1 ) CO 2 for periods from 79 to 189 d. Under these conditions there is increased growth of A. capillaris and P. alpina, but reduced growth of F. vivipara. Nutrient use efficiency, nutrient productivity (total plant dry weight gain per unit of nutrient) and nutrient allocation of all three grass species were measured in an attempt to understand their individual growth responses further and to determine whether altered nutrient-use efficiencies and productivities enable plants exposed to an elevated atmospheric CO 2 environment to overcome potential limitations to growth imposed by soil fertility
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