南黄海表层沉积物中氮的区域地球化学特征

通过分级浸取分离的方法获得了南黄海表层沉积物不同形态的氮，首次探讨其分布的区域性特征：南黄海表层沉积物中各形态氮在不同测线上均呈现出波状分布。B测线的基本上呈现出中部海域高，两边海域低，而西部海域又略高于东部海域的趋势，D和E测线的基本上呈现出西高、东低的趋势，C测线的则呈现出西低、东高的趋势，F测线的变化趋势比较平缓，从整体上看，SOEF—N和TN的分布呈现出西部海区比东部海区低的趋势。受各测线上沉积物种类差异的影响，自北向南各形态氮的变化幅度逐渐减小，其中SOEF-N在各测线上的变化幅度最大，且自北向南降幅最大。受水动力及沉积物粒度的影响，不同形态氮在黄海槽内各站位沉积物中的含量较高。沉积物中各形态氮在不同测线上的分布还表明，陆源输入对南黄海沉积物中氮测线分布有较小的影响，海洋自生氮对南黄海表层沉积物中氮的形态、含量与分布具有重要影响。

Regional Geochemical Characteristics of Nitrogen in the Southern Yellow Sea Surface Sediment

It is shown from the observed results that the different forms of nitrogen in the southern Yellow Sea surface sediments on 5 survey lines showed undulating distributions. Generally speaking, the contents of different forms of nitrogen in surface sediments on survey lines B,D and E showed trends decreasing eastward, those on survey line C showed trends increasing eastward, and those on survey line F showed a gentle variational trend. On the whole, the contents of SOEF-N and TN were lower in the western sea area than in the eastern sea area. Because of the effects of the difference in sediment variety on different survey lines, the variational ranges of different forms of nitrogen decreased from north to south, among them, those of SOEF-N were the largest with the maximum decreasing range from north to south. Because of the effects of hydrodynamics and sediment grain size, the contents of different forms of nitrogen in surface sediments at stations in the Yellow Sea Trough were higher. It is shown from the distributions of different forms of nitrogen in surface sediments on different survey lines that the terrigenous input nitrogen had less effect on the distributions of nitrogen in the southern Yellow Sea surface sediments, and the marine autogenous nitrogen had significant effect on the form, content and distribution of nitrogen in the southern Yellow Sea surface sediments.