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Production and Utilization of Dissolved Organic Carbon During in situ Phytoplankton Photosynthesis Measurements
Author(s) -
Allen Harold L.
Publication year - 1973
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19730580606
Subject(s) - phytoplankton , dissolved organic carbon , environmental chemistry , photosynthesis , total organic carbon , carbon fibers , chemistry , biomass (ecology) , total inorganic carbon , environmental science , carbon dioxide , nutrient , ecology , biology , materials science , biochemistry , organic chemistry , composite number , composite material
Rates of phytoplankton photosynthesis, extracellular release of dissolved organic carbon, and production or utilization of dissolved organic carbon during in situ incubation were measured in a soft‐water Vermont lake during summer thermal stratification. Phytoplankton photosynthesis rates were frequently in the range of 300–600 mg C m −2 of lake surface day −1 ; extracellular release of previously fixed organic carbon was generally in the range of 20–75% of the carbon incorporated into cell biomass, as determined by gas‐phase radio‐analysis. Rates of increase or decrease in total dissolved organic carbon occurring in light and dark incubated phytoplankton samples, during brief (4 hour) in situ measurements, indicate that a significant fraction of the total dissolved organic carbon „pool” is probably labile and rapidly being cycled.