中文摘要：

利用分级浸取分离法将黄海、东海陆架区沉积物氮分为转化态氮（TF-N）和非转化态氮，并将可转化态氮区分为4种形态：离子交换态氮IEF-N、碳酸盐结合态氮CF-N、铁锰氧化态氮IMOF-N及有机态和硫化物结合态氮OSF-N。对各形态氮的平面、垂直和沉积剖面年际分布进行了分析，并进一步探讨了该区域氮形态与古生产力的替代指标——生物硅（BSi）的相关性，揭示了氮形态的地球化学特征及与浮游植物总量的关系。结果表明，黄海、东海陆架区表层沉积物中可转化态氮占总氮的百分比为16．81％，可转化态氮中4种形态氮的平均含量为：IMOF-N（66．65／μg／g）〉IEF-N（22．96#g／g）〉OSF-N（17．40肚g／g）〉CF-N（11．26#g／g），IMOF-N是可转化态氮的优势形态；柱状沉积物中各形态氮垂直分布不同，长江1：1沉积物中各形态氮垂向变化幅度大于南黄海中部；离子交换态氮IEF-N和铁锰氧化态氮IMOF-N对浮游植物总量贡献较大。

英文摘要：

Nitrogen in marine sediment of Huanghai Sea and East China Sea continental shelf area was defined as transferable part and non-transferable part,with a sequential extraction separation method. Four forms of transfer- able part in marine sediment were ion-exchange form（IEF-N）,carbonate form（CF-N）, iron-manganese oxides form （IMOF-N）, and organic matter-sulfide form （OSF-N）, respectively. The horizontal, vertical distribution, and the age of the deposition profiles of the four forms were given. The correlation among different forms of nitrogen and bio- genic silica （BSi） the alternative indicators of paleoproductivity were further explored,revealing the geochemistry of the forms of nitrogen and relations with the total phytoplankton. The results showed that transferable nitrogen accounted for 16.81%0 of total nitrogen （TN） and the average content of four different transferable forms nitrogen in the surface area were IMOF-N（66.65 μg/g））IEF-N（22.96 μg/g） 〉OSF-N（17.40 /,g/g））CF-N（11.26μg/ g） ,respectively. IMOF-N was the advantage form of transferable nitrogen in the surface area; various forms of ni- trogen in each station were different,and there＇s a wide variation in different nitrogen forms of the Changjiang Es- tuary ,compared with the central southern Huanghai Sea; BSi, IEF-N and IMOF-N in the southern Huanghai Sea surface sediments and columnar were correlated significantly,and the relevance of BSi and various forms of nitrogen were not obvious in the Changjiang Estuary and along the coast of Fujian and Zhejiang Province. IEF-N and IMOF-N had a greater contribution to the total phytoplankton.