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. 2011 May 13;167(2):293–303. doi: 10.1007/s00442-011-2011-3

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© The Author(s) 2011

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Fig. 5 — Modeled versus observed relative effects of elevated CO₂ on net primary productivity (NPP, open symbols), canopy photosynthesis (gross primary productivity GPP, black symbols) and leaf area index (LAI, grey symbols) obtained at four different elevated CO₂ (FACE) experiments conducted in the field: POPFACE (three different poplar species, circles), aspen birch (triangles), sweetgum (diamonds) and Loblolly pine (squares). r ² = 0.83 for all observed versus modeled data. Figure redrawn from Franklin (2007)