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《Journal of Fisheries Research》 2018-03
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Characteristics on spatial and temporal variations of nitrogen in water of cage culture areas of Zhanghu reservoir bay

ZENG Tao;Freshwater Fisheries Research Institute of Fujian;  
To study the characteristics on spatial and temporal variations of nitrogen in water from cage culture areas,the surface and bottom waters collected from different cage culture areas of Zhanghu reservoir bay were determined and analyzed monthly for the content of total nitrogen,ammonium nitrogen,and nitrate nitrogen from June 2016 to May 2017.The seasonal variation and correlation of various nitrogen forms in different water layers of the cage culture areas were discussed.The results showed that the annual average content of NO~-_3-N and TN in the bottom waters of the cage culture areas were higher than that in the control areas,while the content of total nitrogen(TN)and NH~+_4-N in the surface waters of the cage culture areas was lower than that in the control areas.The main form of inorganic nitrogen in both culture areas and control areas was NO~-_3-N,followed by NH~+_4-N,while the content of NO~-_2-N was the least.The seasonal change of TN,NO~-_3-N,NH~+_4-N,and NO~-_2-N in culture areas and control areas varied similarly.According to the correlation among various forms of nitrogen in the water,there was a significant correlation among the various forms of nitrogen in the surface waters of culture areas(P0.01)while there was no significant correlation in water of the control areas(P0.05)except that there was a significant correlation between NO~-_3-N and TNin the surface water(P0.01)and NH~+_4-N and TN in the bottom water(P0.01).
【Fund】: 福建省公益类科研院所基本科研专项(2015R1002-7)
【CateGory Index】: S959
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