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Biogeochemistry of organic matter and associated elements along the river-estuary-ocean continuum
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Effects of algal bloom on dynamics of dissolved organic matter in the Yangtze Estuary
P-C1-03
Penghui Li* , Department of Ocean Science and Engineering, Southern University of Science and Technology
Qinghui Huang, School of Environmental Science and Engineering, Tongji University
Ling Chen, School of Environmental Science and Engineering, Tongji University
Chuanlun Zhang, Department of Ocean Science and Engineering, Southern University of Science and Technology
Presenter Email: lipenghui1987@126.com |
| To investigate the effects of algal bloom on dissolved organic matter (DOM), surface water samples were collected during algal-bloom and non-bloom periods in the Yangtze Estuary and characterized using UV-Vis spectroscopy and fluorescence spectroscopy. The DOC addition were identified during algal-bloom period while there was no apparent increase of chromphoric DOM (CDOM) and fluorescent DOM (FDOM). This indicates that primary production was an important source for DOC, resulting high DOC concentration during algal bloom, and could not contribute significantly to CDOM and FDOM pools in a short period. To further assess the effects of algal-bloom on the dynamics of DOM in the Yangtze Estuary, microbial incubation was conducted for DOM sample collected from algal-bloom and non-bloom periods. The results showed that both CDOM and humic-like FDOM increased after 40-d incubation for algal-bloom samples while CDOM and humic-like FDOM showed decrease or little variation for non-bloom samples. This indicated that there is a time lag between algal bloom and CDOM/FDOM could be produced microbially from DOM released during algal bloom. Collectively, our results showed that algal bloom could contribute to increase of DOC instantly but CDOM/FDOM over a medium period of time. |
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