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- W2366504745 abstract "Nitrogen circulation characteristics and their relations to environmental factors in Beihai pearl oyster far-ming areas are analyzed to clarify water environment conditions and provide support to pearl oyster breeding and ecological environment protection.Data used in the study were obtained in an investigation of the Yingpan farming area of the Tieshan Port,Beihai(a farming area of the famous south pearl;seven monitoring sites) and non-farming sea areas(seven monitoring sites) of Beihai in September 2008 and April 2009.The results show that the nitrogen contents is lower and has good regularity with the biologic chain in different areas in spring,which corresponds to the implantation stage of pearl oyster nuclei.Negative correlation between DON content and pH,DIN and SS contents,and DIN and TOC centents all became significant(p0.01),whereas the water environment was mainly controlled by oxygen consumption.In autumn,as the pearl oyster reached its grow-out stage along and there was a significant increase in food intake and discharge,the contents of TN,DN,DON increased greatly.The DIN content also increased obviously;nonetheless,it was still far below the first grade seawater standard.Only NH4-N content had significant(p0.05) negative correlation with the water temperature.The concentration of dissolved oxygen increased in the water environment.The nitrogen content in the non-farming sea areas indicated an association with the pearl oyster breeding areas only in terms of TN,PN and DN,both in spring and autumn.The contents of various states of nitrogen had a closer relation with environmental factors in autumn than in spring;particularly significant was the correlation between DIN content and pH,and the negative correlation between DN and SS contents,NH4-N and SS contents.The TN,DN,DON,and DIN contents varied 10.66~16.96,6.82~12.85,4.43~11.63,and 0.69~2.81 mol/dm3 in spring and 14.07~28.01,12.22~23.01,11.01~21.59,and 1.08~3.11 mol/dm3 in autumn,and averaged 13.46,8.86,7.11,and 1.75 mol/dm3 in spring and 20.54,17.00,15.34,and 1.65 mol/dm3 in autumn.Good nitrogen cycling both in pearl oyster farming areas and non-farming sea areas,and the important role played by the biological chain in our study area,will benefit the sustainable development of the eco-environment." @default.
- W2366504745 created "2016-06-24" @default.
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- W2366504745 date "2011-01-01" @default.
- W2366504745 modified "2023-09-23" @default.
- W2366504745 title "Distribution of nitrogen and its relations to environmental factors in pearl oyster farming areas and non-farming areas of Beihai Waters" @default.
- W2366504745 hasPublicationYear "2011" @default.
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