Study on diel rhythm of chlorophyll a and photosynthesis in nearshore waters of Qingdao

A study was made on the dial rhythm and variation of Chl a and photosynthesis in the nearshore of qingdao. Both Chl a and photosynthesis show obvious dial rhythm; the peak value of surface Chl a appeared in the afternoon,while bottom Chl a around noon;the maximum value of photosynthetic rate appeared in the morning, noon and afternoon. The scope of the diet rhythm of Chl a and photosynthesis and the time for the appearance of the peak value varied in different months. Moreover, the mechanism of the formation of this diet rhythm is also discussed in this paper.