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Interactions between elevated CO 2  and N cycling were explored with a nutrient cycling model (NuCM, Johnson et al. 1993, 1995) for a  Pinus taeda  L. site at Duke University, North Carolina, and a mixed deciduous site at Walker Branch, Tennessee. The simulations tested whether N limitation would prevent growth increases in response to elevated CO 2 , and whether growth responses to CO 2  in N-limited systems could be facilitated by increasing the biomass/N ratio (reducing N concentration) or increasing litter N mineralization, or both.

Simulated nitrogen cycling response to elevated CO 2 in Pinus taeda and mixed deciduous forests