Nutrient concentrations and fluxes in the Changjiang Estuary during summer |
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| Authors: | CHEN Hongtao YU Zhigang YAO Qingzheng MI Tiezhu and LIU Pengxia |
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| Institution: | 1.Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China2.Key Laboratory of Marine Environment Science and Ecology of Ministry of Education, Ocean University of China, Qingdao 266100, China |
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| Abstract: | In June 2003 and 2006 concentrations of nutrient were determined in the Changjiang Estuary. The
data indicated that phosphate and nitrate did not behave conservatively in the estuary, but silicate
behaved conservatively. An important mobilization of phosphate and nitrate was observed from the
river up to halfway in the estuary. Both input flux (from river to estuary) and output flux (from
estuary to coastal zone) of phosphate, silicate and nitrate were calculated from statistical inter-
pretations of the salinity profiles. There was a large discrepancy between input and output fluxes
of phosphate and nitrate. The river fluxes of silicate, phosphate and nitrate (fr) are augmented
5.3%, 28.9% and 36.6% in June 2003 and 1.0%, 62.5%, 31.7% in June 2006 by internal inputs (fi).
The phosphate and nitrate fluxes are enhanced through the estuarine process, while silicate flux
is unaltered. The authors present some long-term data for nutrient concentrations and the ratios
of silicon to nitrogen to phosphorus in the Changjiang Estuary. Silicate level falled in the last
two decades, while concentration of nitrate increased. Phosphate concentration had no significant
change. |
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| Keywords: | nutrients estuarine environment distribution behaviour transport China Changjiang Estuary |
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