南黄海表层不同粒级沉积物中氮的地球化学特征
Geochemical characteristics of nitrogen in different grain size sediment from the southern Huanghai Sea
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摘要: 南黄海不同粒级沉积物中可转化氮[离子交换态氮(IEF-N)、弱酸可浸取态氮(WAEF-N)、强碱可浸取态氮(SAEF-N)、强氧化剂可浸取氮(SOEF-N)]的地球化学特征各不相同,其中SOEF-N是3种粒级沉积物中含量最高的形态,IEF-N是可转化无机氮中的主要存在形态,也是最易参与循环的形态.当同一粒级沉积物中的可转化不同形态氮都能参与循环时,它们对氮循环的相对贡献从大至小依次为SOEF-N>IEF-N>SAEF-N>WAEF-N.对于不同粒级的沉积物来说,细粒级沉积物中的可转化不同形态氮的绝对含量最高,粗粒级沉积物中不同形态氮的绝对含量最低;如果沉积物中3种粒级组分所占的份额相同,那么细粒级沉积物中可转化氮的量占总可转化氮的60%,是中粒级中的2倍,粗粒级沉积物中可转化氮的近7倍,即细粒级沉积物对氮循环的可能贡献最大.随着沉积物粒级的由粗到细,沉积物中可转化有机氮的相对含量逐渐增加,而无机氮的相对含量逐渐降低.Abstract: The geochemical characteristics of transferable nitrogen in different grain size sediments are different.The content of SOEF-N is the highest in all transferable nitrogen.IEF-N is the predominant form in inorganic transferable nitrogen,which could take part in cycling more easily.If all the transferable forms of nitrogen could take part in cycling in suitable conditions,their relative contributions to cycling decrease according to the orderof SOEF-N,IEF-N,SAEF-N and WAEF-N.In differen grain size sedmients,the absolute contents of different trans-ferable forms of nitrogen are the highest in fine sedmients and the lowest in coarse sediments.If the proportions of each grain in sedmients are the same,the contents of transferable nitrogen in fine sediments can amount to 60% of the total transferable nitrogen,which is twoldtmies of that in medium size sedmients and amlost seven tmies of that in coarse sediments.Namely that,fine sediment has the highest potential contribution to nitrogen cycling.In addition,the relative contents of organic transferable nitrogen increase with grain size finer,while those of inorganic nitrogen decrease.
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Key words:
- sedmient /
- grainsize /
- nitrogen cycling /
- Huanghai Sea
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