Effect of dissolved phosphorus on alkaline phosphatase activity in marine microalgae

摘要

Alkaline phosphatase activity (APA) and dissolved phosphorus were monitored during the batch cultures of two marine microalgae. Results indicate that variation of APA was in the shape of "S" curve. Different species of dissolved phosphorus had different effects on APA. The concentrations of dis- solved inorganic phosphorus (DIP) and small molecular dissolved organic phosphorus (SDOP) had a sig- nificant effect on APA, while the concentration of large molecular dissolved organic phosphorus (LDOP) had a little effect on APA., and the increase of APA could accelerate the decomposing of LDOP in the medium. Results also show that algae species and abundance had only a little effect on APA.