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We compared vertical gradients in leaf gas exchange, CO 2  concentrations, and refixation of respired CO 2  in stands of  Populus tremuloides  Michx.,  Pinus banksiana  Lamb. and  Picea mariana  (Mill.) B.S.P. at the northern and southern boundaries of the central Canadian boreal forest. Midsummer gas exchange rates in  Populus tremuloides  were over twice those of the two conifer species, and  Pinus banksiana  rates were greater than  Picea mariana  rates. Gas exchange differences among the species were attributed to variation in leaf nitrogen concentration. Despite these differences, ratios of intercellular CO 2  to ambient CO 2  ( c  i / c  a ) were similar among species, indicating a common balance between photosynthesis and stomatal conductance in boreal trees.

Vertical gradients in photosynthetic gas exchange characteristics and refixation of respired CO 2 within boreal forest canopies