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DEGRADATION OF DISSOLVED ORGANIC MATTER FROM DEAD PHYTOPLANKTON OFF THE CHANGJIANG RIVER ESTUARY AND THE RESULTING DISSOLVED OXYGEN CONSUMPTION
Author(s): 
Pages: 1010-1017
Year: Issue:  5
Journal: Oceanologia et Limnologia Sinica

Keyword:  phytoplanktondissolved organic matter(DOM)degradationdissolved oxygen(DO);
Abstract: Dissolved organic matter(DOM) derived from marine phytoplankton is one of the main sources of DOM in the ocean. The biodegradation of fresh DOM released from dead phytoplankton can reduce significantly dissolved oxygen(DO) due to its high bioactivity and huge amount. At present, such a degradation process and the corresponding oxygen consumption are poorly studied. In this study, we sampled seawater in three stations by net collection in Changjiang River estuary, filtrated with 200 μm mesh and frozen at –20°C for at least 24 h. Samples were incubated to investigate the mechanism of degradation process and the consumption of dissolved oxygen, and possible link to hypoxia off the estuary. The results show that both dissolved organic carbon(DOC) and DO showed an exponential decay, during which total dissolved carbohydrate degraded significantly. Moreover, the degradation rate constant of DOC was influenced by the concentration and activity of DOC, so did the DO content. Bacteria density increased more apparently in our experiment without Hg Cl2 addition than with the adding, indicating the bacteria plays an important role in the degradation of DOM. Therefore, rapid degradation of DOM and the resulting consumption of oxygen would have an important impact on hypoxia off the Changjiang River estuary.
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