PRODUCTIVITY RELATIONS IN CARBOY MICROCOSMS1

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Abstract

<jats:p>Measurements of gross photosynthesis; respiration, rate of net oxygen diffusion, and organic storage are reported for 7 microcosms maintained over periods of 5 to 7 months. Average rates of gross photosynthesis ranged from 0.86 to 1.69 g O<jats:sub>2</jats:sub>/m<jats:sup>2</jats:sup>/day and were related to the amounts of inorganic nutrients added. Average final organic storage was equal to 35.6% of gross photosynthesis. Assumed photosynthetic quotients between 0.88 and 1.03 allowed the construction of oxygen budgets in which the total product of gross photosynthesis was accounted for. Some problems of establishing productive microcosms representing natural situations are also discussed.</jats:p>

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