Abstract
The unusual growth pattern exhibited by Juncus bulbosus L. in a slightly acidic Swedish brown-water lake is due to a CO 2 deficit. Decrease in growth rate during the summer can be avoided through CO 2 addition in July when CO 2 availability is low and epiphytes are thriving. Growth of J. bulbosus in the laboratory is stimulated by CO 2 addition up to a concentration somewhat higher than in air (550 ppm), while higher CO 2 pressure restrains growth. Root growth refeects the leaf biomass development, but is favoured by elevated CO 2 levels even more than the leaves.
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