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Figure 1


Gas exchange of current-year stems of Fagus sylvatica L. measured as CO2 efflux in the dark (dark respiration rate, Rd), CO2 efflux under saturated light (Rl) and calculated rates of gross photosynthesis (Pg), for each N treatment (T1, T2, and T3). Data are means ±1 SE, with n = 3. Letters (a, b, and c) indicate significant differences between N treatments, for each parameter (Rd, Rl and Pg).

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