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《Studia Marina Sinica》 1994-00
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NUTRIENTS IN JIAOZHOU BAY WATERS

Shen Zhiliang, Lu Jiaping, Liu Xingjun and Wang Yifei (Institute of Oceanology, Academia Sittica)  
This paper discusses 1983-1986 space-time distributions of NO3-N, NO2-N, NH4-N, PO4-P and SiO3-Si, their origins and the relationships between them and other environmental factors. High concentrations of inorganic N (particularly NH4-N). and PO4-P were found in eastern and northeastern waters and low concentrations in the middle waters of the Jiaozhou Bay, bay mouth and outer bay waters, indication clearly that the high concentrations of inorganic N and PO4-P were mainly from the output of industrial and residential area sewage in the east coast. The concentration of NH4-N (yearly average, 5.0-10.2 μmol/L during 1983 - 1986) was much higher than NO3-N (yearly average, 1.1-2.5μmol/L during 1983-1986) in the Jiaozhou Bay seawater, and the higher concentration of NH4-N (about 72 per cent of total inorganic N) was the main form of inorganic N in the seawater. The atomic ratio between NO3-N and PO4-P (monthly average, 1.4 - 16.1, yearly average, 5.8 in 1985) was much lower than that between total inorganic N and PO4-P(monthly average, 9.3-60, yearly average, 19.4 in 1985). It showed the system of NH4-N, NO2-N and NO3-N was not thermodynajnic equilibrium. The concentration of SiO3-Si was lower (monthly average, 0.47-5.7 μmol/L, yearly average, 2.7μmol/L) and could not be detected at some stations in some months. It was possible that low concentration SiO3-Si sometimes limited the growth of phytoplankton.There w.ere negative linear relationships between most nutrients and salin- ity in the heavy rain season in 1985 which showed that their concentrations were controlled by its dilution in sea water. The relationship of the monthly average concentration of NO3-N in the surface seawater to salinity (range of salinity, 26.25-32.92) from 1983 to 1986 was as given below:NO3-N (μmol/L) =34.833 -1.042 (salinity) (r =-0.821, .?= 37).Except for being polluted in some parts, as a whole the water quality was good in Jiaozhou Bay. The contents of inorganic N and PO4-P were moderate and had rising tendency (mainly NH4-N) . They had rich origin beneficial to phytoplankton growth. The seasonal variations of nutrients were related to phy-toplankton breeding, raining and other environmental factors and showed some different laws from the sixties, which is inseparable from the effects of the human race activities.
【CateGory Index】: P734
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