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THE LIMNOLOGY OF CANYON FERRY RESERVOIR: III. SOME OBSERVATIONS ON THE DENSITY DEPENDENCE OF PHOTOSYNTHESIS AND ITS CAUSE 1
Author(s) -
Wright John C.
Publication year - 1960
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1960.5.4.0356
Subject(s) - photosynthesis , photic zone , standing crop , chlorophyll , chlorophyll a , canyon , respiration , photosynthetic pigment , environmental science , botany , biology , phytoplankton , agronomy , nutrient , ecology , geology , biomass (ecology) , geomorphology
A series of 24‐hr determinations of net photosynthesis confirmed the conclusions derived from previous 6‐hr experiments that the relationship between photosynthesis and standing crop is not linear. The optimal rate of net photosynthesis per unit chlorophyll varied inversely with chlorophyll concentration. As a result net euphotic zone photosynthesis was maximal at intermediate values of chlorophyll concentration and was less at chlorophyll concentrations above or below the intermediate range. From previously derived relationships between chlorophyll, gross photosynthesis, and respiration, values of net euphotic zone photosynthesis were computed for each chlorophyll concentration. The computed values agreed well with the observed values. The decline of CO 2 concentration as standing crop increased was suggested as the most probable cause of the observed photosynthesis standing crop relationship.