| Variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang （Yangtze River） Estuary |
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| 引用本文： | 刘启贞,李九发,应铭,李道季,左书华,谢君.Variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang （Yangtze River） Estuary[J].中国地球化学学报,2007,26(1):84-90. |
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| 作者姓名： | 刘启贞 李九发 应铭 李道季 左书华 谢君 |
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| 作者单位： | State Key Laboratory of Estuaries and Coastal Research East China Normal University，State Key Laboratory of Estuaries and Coastal Research，East China Normal University，State Key Laboratory of Estuaries and Coastal Research，East China Normal University，State Key Laboratory of Estuaries and Coastal Research，East China Normal University，State Key Laboratory of Estuaries and Coastal Research，East China Normal University，Department of Chemistry，Oregon State University，Shanghai 200062，China，Shanghai 200062，China，Shanghai 200062，China，Shanghai 200062，China，Shanghai 200062，China，Oregon 97006，USA |
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| 基金项目： | Acknowledgements The authors wish to express their gratitude to Liu James T., Shi Lianqiang, Hu Xiaodong, Li Weihua, and Fu Gui for their help with field and laboratory work. This research was granted by the National Natural Science Foundation of China （50579021） and the National Key Basic Research Program of China （No. 2002CB412405）. |
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| 摘 要： | Dissolved inorganic nutrient elements were analyzed from the samples collected in the South Passage of the Changjiang (Yangtze River) Estuary in March 2003, including NH4 , NO3-, NO2- and PO43-. The water samples were collected with a Niskin sampler hourly at the near-surface, middle and near-bottom depths at the three stations -A1, A2 and A3-during two complete tidal cycles of neap tide and spring tide. Results showed that 1) the concentrations of NH4 , NO3- and NO2- were a little higher respectively during the neap tide than those during the spring tide, while PO43- showed an opposite trend, and each was higher in the ebb tide than in the flood tide, either for the neap tidal cycle or the spring tidal cycle; 2) higher stratification of the nutrients existed obviously in this area, with the concentrations of which increased from the bottom to the surface, especially for NH4 and NO3-; 3) the coefficient of variation (C.V.) values of all dissolved inorganic nutrients varied from 4.06% to 36.8% beyond different influences of the tidal current and Changjiang runoff; 4) with increasing suspended matter in the water column, the concentrations of PO43- became lower in the filtered water; and 5) the total transport of each tidal cycle was much more in the spring tide than in the neap tide, and the positive values indicated that the nutrients had been exported to the East China Sea. Studies on the variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang Estuary will provide the scientific basis for the study of the mechanism of red tide in the East China Sea.
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| 关 键 词： | 长江口 河口 南水道 溶解无机养分 变异 净输移 |
| 收稿时间： | 2006-01-11 |
| 修稿时间： | 2006-03-20 |
Variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang (Yangtze River) Estuary |
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| Liu?Qizhen,Li?Jiufa,Ying?Ming,Li?Daoji,Zuo?Shuhua,Xie?Jun.Variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang (Yangtze River) Estuary[J].Chinese Journal of Geochemistry,2007,26(1):84-90. |
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| Authors: | Liu Qizhen Li Jiufa Ying Ming Li Daoji Zuo Shuhua Xie Jun |
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| Institution: | (1) State Key Laboratory of Estuaries and Coastal Research, East China Normal University, Shanghai, 200062, China;(2) Department of Chemistry, Oregon State University, Oregon, 97006, USA |
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| Abstract: | Dissolved inorganic nutrient elements were analyzed from the samples collected in the South Passage of the Changjiang (Yangtze
River) Estuary in March 2003, including NH4
+, NO3
−, NO2
− and PO4
3−. The water samples were collected with a Niskin sampler hourly at the near-surface, middle and near-bottom depths at the
three stations—A1, A2 and A3—during two complete tidal cycles of neap tide and spring tide. Results showed that 1) the concentrations
of NH4
+, NO3
− and NO2
− were a little higher respectively during the neap tide than those during the spring tide, while PO4
3− showed an opposite trend, and each was higher in the ebb tide than in the flood tide, either for the neap tidal cycle or
the spring tidal cycle; 2) higher stratification of the nutrients existed obviously in this area, with the concentrations
of which increased from the bottom to the surface, especially for NH4
+ and NO3
−; 3) the coefficient of variation (C.V.) values of all dissolved inorganic nutrients varied from 4.06% to 36.8% beyond different
influences of the tidal current and Changjiang runoff; 4) with increasing suspended matter in the water column, the concentrations
of PO4
3− became lower in the filtered water; and 5) the total transport of each tidal cycle was much more in the spring tide than
in the neap tide, and the positive values indicated that the nutrients had been exported to the East China Sea. Studies on
the variations and net transport of dissolved inorganic nutrients in the South Passage of the Changjiang Estuary will provide
the scientific basis for the study of the mechanism of red tide in the East China Sea. |
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| Keywords: | dissolved inorganic nutrient South Passage transport Changjiang (Yangtze River) Estuary |
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