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《Oceanologia Et Limnologia Sinica》 1991-06
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A STUDY ON THE EFFECTES OF THE THREE GORGE PROJECT ON THE DISTRIBUTIONS AND CHANGES OF THE NUTRIENTS IN THE CHANGJIANG RIVER ESTUARY

Shen Zhiliang(Institute of Occanology, Academia Sinca, Qingdao, 266071)  
In this paper, the correlative equations between the flows of the Changjiang River water into-the sea and the output fluxes of the nutrients proposed by author were verified on the base of five cruises investigations in the Changjiang River estuary and its near seas from August, 1986 to October, 1988 and historical data in recent years. It shows that in addition to ammonia, the exponential correlationships between the output fluxes of the nutrients and the flows of the Changjiang River water are all possitive. The annual average output fluxes of the phosphate, silicate, nitrate, nitrite, ammonia and total inorganic nitrogen from the Changjiang River water into the sea were estimated to be 1.51×104, 222.10×104, 69.10×104, 0.46×104 8.79-10×104 and 91.20×104 tons respectively. The annual changes of the distributions of the nutrients in April and October and the relationships between them and the flows of the Changjiang River water were also discussed. It is possible that if three Gorge reservoir is built, the average concentrations of the nutrients in the Changjiang River estuary seas will decrease, the isograms will move toward the river mouth and higher condensation areas of the nutrients will reduce due to the decreas in the flow of the Changjiang River water (in October).
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