Esthation of leaf photosynthetic rate (A) from leaf nitrogen content (N) is both conceptually and numerically important in models of plan~ecosystem and biosphere responses to global change. The relationship between A and N has been studied extensively at ambient C02 but much less at elevated C@.This study was designed to (1) assess whether the A-N relationship was more similar for species within than between community and vegetation types, and (2)
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