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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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Ambient plant nitrogen (N) uptake (fN_up; a, b) and its response to elevated CO₂ (c, d) at the Duke (a, c) and Oak Ridge National Laboratory (ORNL) (b, d) Free-Air CO₂ Enrichment (FACE) experiments. The observations are across-plot averages, and the error bars denote ± 1SE.