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. 2000 Oct 24;97(23):12428–12432. doi: 10.1073/pnas.220280097

Figure 3.

Figure 3

Effects of the Permo-Carboniferous pO2 rise at two different pCO2 levels on annual (a) terrestrial NPP, (b) canopy transpiration (Et), and (c) water-use efficiency (WUE, defined as NPP divided by Et) during the late Carboniferous, analyzed on a site-by-site basis. Open symbols represent results from case 2 (35% O2, 0.03% CO2); solid symbols represent results from case 4 (35% O2, 0.06% CO2). All values are expressed as the differences between results from the specified atmospheric composition and the control (case 1).