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. 2014 Jan 28;202(3):803–822. doi: 10.1111/nph.12697

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© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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First year response of net primary production (NPP) to elevated atmospheric [CO₂] (eCO₂) (a, b) and the change between the first year and the final 5 yr of the experiment (c, d) at the Duke and Oak Ridge National Laboratory (ORNL) Free-Air CO₂ Enrichment (FACE) sites, respectively, as well as the response of plant nitrogen (N) uptake (fN_up) and whole-plant N-use efficiency (NUE). The grey boxes denote the mean observed eCO₂ response ± 1SE.