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《MARINE SCIENCES》 1997-01
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THE PRESENT AND VARIATIONS OF NUTRIENTS IN JIAOZHOU BAY

Shen Zhiliang(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071)  
The space time distributions of NO 3 N, NO 2 N, NH 4 N, PO 4 P and SiO 3 Si in Jiaozhou Bay from May 1991 to February 1994 ( 12 times investigations) are discussed in this paper. The horizontal distributions of nutrients showed high concentrations of them in northern, north eastern and eastern waters and low concentrations in southern and south western. The concentrations of nutrients were much higher inside bay than outside bay. The seasonal variations of nutrients similar to Chla showed some different laws every year. High atomic ratio between total inorganic N and PO 4 P(seasonal average, 28) and low between NO 3 N and PO 4 P(seasonal average, 4.6) showed that phytoplankton growth mainly was limited by PO 4 P and NH 4 N was the main form of inorganic N in the seawater. From the 1960s to the 1990s, the distributions of nutrients in Jiaozhou Bay have had greater variations particularly from the 1960s to the 1980s. In 30 years, their concentrations in eastern and the middle waters have increased 2.2 times for PO 4 P, 7.3 times for NO 3 N, 7.1 times for NH 4 N and 3.5 times for total organic N. The atomic ratio between total inorganic N and PO 4 P and the ratio between total inorganic N and total N increaced from 10 to 24.2 and from 3.7% to 6.3% respectively. But the ratio between NH 4 N and total inorganic N keeps the leval of 78 79%. A great deal of increase of nutrients in Jiaozhou Bay is the direct result of humen influence.
【Fund】: 中国科学院重大项目资助!KY85 - 0 8- 0 1
【CateGory Index】: S949
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