抄録
On the diurnal variation of the amount of dissolved oxygen in the upper layers of the hydrosphere, the theoretically obtained results were verified in this paper by experiments carried out in water tanks kept in light and dark. Pond water in which phytoplanktons were flourishing was illuminated with a candescent lamp, and the time variation of dissolved oxygen was determined. The effect of escape from water surface due to diffusion of oxygen upon its time variation was clarified. Under a certain condition of illumination, no change of oxygen content was found in the 20 cm deep layer. It is noticeable that in this layer the time variation of oxygen content obtained experimentally agreed with the theoretical result. On the contrary, in an upper layer above the depth of 20 cm, the maximum amount of dissolved oxygen appeared earlier than was expected theoretically.
