Variations in (a) leaf intercellular CO<sub>2</sub> concentration (<i>c</i><sub><i>i</i></sub>) and ambient CO<sub>2</sub> concentration (<i>c</i><sub><i>a</i></sub>), (b) <sup>13</sup>C discrimination ratios (<i>c</i><sub><i>i</i></sub>/<i>c</i><sub><i>a</i></sub>) and (c) intrinsic water-use efficiency (iWUE) calculated from three scenarios as a baseline for interpreting the gas exchange in response to increasing <i>c</i><sub><i>a</i></sub> over the period of 1865–2013.
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Abstract
<p>The atmospheric CO<sub>2</sub> were derived from McCarroll and Loader [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172045#pone.0172045.ref002" target="_blank">2</a>].</p
