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To study the responses of Scots pine ( Pinus sylvestris  L.), a commercially important tree species in Europe, to future increases in atmospheric CO 2  concentration ([CO 2 ]), we grew saplings for 4 years in the ground in open-top chambers in ambient or ambient + 400 μmol mol −  CO 2 , without supplemental addition of nutrients and water. Carbon (C) budgets were developed for trees in both CO 2  treatments based on productivity and biomass data obtained from destructive harvests at the end of the third and fourth years of treatment, and simulations of annual gross photosynthesis ( P  tot ) and maintenance respiration by the model MAESTRA.

Carbon budget of Pinus sylvestris saplings after four years of exposure to elevated atmospheric carbon dioxide concentration