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Naturally seeded Scots pine ( Pinus sylvestris  L.) trees, age 25–30 years, were subjected to two soil-nitrogen-supply regimes and to elevated atmospheric CO 2  concentrations by the branch-in-bag method from April 15 to September 15 for two or three years. Gas exchange in detached shoots was measured in a diffuse radiation field. Seven parameters associated with photosynthetic performance and two describing stomatal conductance were determined to assess the effects of treatments on photosynthetic components. An elevated concentration of CO 2  did not lead to a significant downward regulation in maximum carboxylation rate ( V  cmax ) or maximum electron transport rate ( J  max ), but it significantly decreased light-saturated stomatal conductance ( g  sat ) and increased minimum stomatal conductance ( g  min ). Light-saturated rates of CO 2  assimilation were higher (24–31%) in shoots grown and measured at elevated CO 2  concentration than in shoots grown and measured at ambient CO 2  concentration, regardless of treatment time or nitrogen-supply regime. High soil-nitrogen supply significantly increased photosynthetic capacity, corresponding to significant increases in  V  cmax  and  J  max . However, the combined elevated CO 2  + high nitrogen-supply treatment did not enhance the photosynthetic response above that observed in the elevated CO 2  treatment alone.

Photosynthetic responses of Scots pine to elevated CO 2 and nitrogen supply: results of a branch-in-bag experiment