This paper studied the changes of oxygen concentration of the internal thallus of Enteromorpha prolifera collected from Yantai by LD transition experiment.The results showed that oxygen was contained in the tubular thallus,and the oxygen concentration reached the maximum steady-state under the light of 360 μmol/m2·s.LD transition experiment showed changes from steady-state maximum oxygen concentration to steady-state minimum concentration occurred within 10 seconds.Furthermore,the oxygen concentration in the minimum steady-state was still higher than that in satu rated seawater
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