We determined the direct effects of atmospheric CO, concentration ([CO,]) on leaf gas exchange, phenolic and carbohydrate allocation in live oak seedlings (Quercus virginiana Mill.) grown at present (370 μmolmol -1 ) or elevated (520 μmolmol -1 ) [CO,] for 6 months in open-top chambers. Two soil nitrogen (N) treatments (20 and 90 μmolmol -1 total N, low N and high N treat- ments, respectively) were imposed by watering the plants every 5 d with modified water soluble fertilizer. Enhanced rates of leaf- level photosynthesis were maintained in plants subjected to elevated [CO 2 ] over the 6-month treatment period in both N treatments.
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Tognetti et al. (1999) studied this question.
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