Characteristics of nitrogen forms in the surface sediments of southwestern Nansha Trough,South China Sea |
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Authors: | Guoxia Zheng Jinming Song Yunming Sun Jicui Dai Peng Zhang |
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Institution: | [1]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China [2]College of Environment and chemical Engineering, Dalian university, Dalian 116622,, China |
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Abstract: | The area of the southwestern Nansha Trough is one of the most productive areas of the southern South China Sea. It is a typical semi-deep sea area of transition from shoal to abyssal zone. To understand distributions and roles of nitrogen forms involved in biogeochemical cycling in this area, contents of nitrogen in four extractable forms: nitrogen in ion exchangeable form (IEF-N), nitrogen in weak acid extractable form (WAEF-N), nitrogen in strong alkali extractable form (SAEF-N) and nitrogen in strong oxidation extractable form (SOEF-N), as well as in total nitrogen content (TN) in surface sediments were determined from samples collected from the cruise in April - May 1999. The study area was divided into three regions (A, B and C) in terms of clay sediment (<4 μm) content at <40%, 40%-60% and >60%, respectively. Generally, region C was the richest in the nitrogen of all forms and region A the poorest, indicating that the finer the grain size is, the richer the contents of various nitrogen are. The burial efficiency of total nitrogen in surface sediments was 28.79%, indicating that more than 70% of nitrogen had been released and participated in biogeochemical recycling through sediment-water interface. |
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Keywords: | nitrogen form surface sediment Nansha Trough South China Sea |
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