湖沼における物質生産測定への ¹⁴C-法の応用について

抄録

In this paper the authors tried some fundamental investigations on the ¹⁴C-method for measuring primary production in the lake in comparison with the O₂-method.
From the results obtained it was confirmed that the ¹⁴C-method is useful for the measurement of the net photosynthesis and the exposure to light for the measurement should not exceed half a day even though in case of the ¹⁴C-method.
In general, dark fixation of CO₂ in lake is low, but occasionally high abnormal values were measured in some waters. It is therefore desirable to determine the dark fixation simultaneously along with the photosynthesis.
Since the ¹⁴C-method is not fit for measuring respiration, proper allowances for respiration should be made in order to calculate the gross photosynthesis.