Turkish Journal of Botany




A two-step experiment was conducted in order to understand whether natural algal communities (fish-pond water) and selected macrophytes (Potamogeton pectinatus L. Elodea nuttallii (Planch.). St.John. and Utricularia L. sp.) + algae were limited by lack of inorganic carbon (IC). First, 0.6 ml 1 M KHCO_3- was added to the water of Vajgar and Ratmirovsky ponds, South Bohemia, and incubated for 180 minutes under 125 µE m^{-2} s^{-1} light. Then light intensity was increased to 150 µE m^{-2} s^{-1} and 0.6 ml 1 M KHCO_3- was added to selected macrophytes + Vajgar pond waters and incubated for 50 and 180 minutes. Initial and final pH, alkalinity and dissolved oxygen were measured and oxygen production was calculated. The results show that neither algae nor algae + experimental plants were limited by the lack of inorganic carbon. Adding KHCO_3- did not cause a considerable increase in oxygen production. As an exception, Utricularia L. sp. was the only macrophyte which increased oxygen production after adding KHCO_3-.

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