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Plant and Cell Physiology, 1963, Vol. 4, No. 2 187-198
© 1963

Article

SPECTRAL CHANGE OF LIGHT WITH DEPTH IN SOME LAKES AND ITS SIGNIFICANCE TO THE PHOTOSYNTHESIS OF PHYTOPLANKTON

MITSURU SAKAMOTO and KINJI HOGETSU

Water Research Laboratory, Faculty of Science, Nagoya University, Nagoya, and Department of Biology, Faculty of Science, Tokyo Metropolitan University Tokyo

  1. A linear relation was found between the relative light intensity at 5 in depth and the mean chlorophyll a content of the euphotic zone, when they were plotted on logarithmic scales. The intensities of underwater lights of different wave lengths were measured by a photocell with various colored filters. It was recognized that with the increase in chlorophyll a content the proportion of blue light fraction became reduced and that of red light increased. A similar relation was also found in the sea.
  2. The photosynthetic rate.light relation was investigated with the suspension of cultured Chlorella and Tabellaria. At low light intensities, the photosynthetic rate for red light was larger than those for blue and green lights. The photosynthetic rate under the mixed light of red and blue was equal to the sum of the rates in the individual lights, so far as the intensity of each light was low. But when the intensity of red light was sufficiently high, the addition of blue light brought no further increase in photosynthesis.
  3. The photosynthetic rate-depth relations were investigated by the surface and underwater exposure methods. Good agreements were found between the results obtained by these two different methods. However, there are some discrepancies between the results of in situ exposure experiments and those obtained by the two methods.

(Received January 11, 1963; )
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