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中文摘要：
利用2002年在崇明东滩采得的CDS、CDM和CDN三个典型区域沉积物剖面样品，测定了其中的有机碳、活性铁、总磷以及粒度等特征参数，分析了地球化学元素的分布变化特征并对其沉积环境的变化进行了探讨。结果表明崇明东滩沉积物中有机碳的含量较大（0．3％-1．07％），垂向分布上，表层／亚表层含量高且变化复杂，中下层有机碳含量逐渐变小。Fe^3＋在整个研究区域均是从表层向下逐渐递减的，Fe^2＋含量逐渐增加。从实验结果判断，所研究区域沉积环境上层以氧化环境为主，呈弱氧化型，中下层以还原环境为主。总磷含量呈现自上而下减少的变化，CDS表现为波浪形变化。分析发现潮滩沉积物各地球化学元素之间不仅相互作用，并且受到沉积物颗粒大小和水动力、物源输入、物理扰动等因素的影响。崇明东滩沉积物氧化还原界面与中、高湖滩划分界大致相当。
英文摘要：
In this paper,the OC ,active iron and total phosphorus （TP）of sediments obtained in three typical regions in the east tidal flat, by studying Chongming islang. The distribution characteristics of Fe^3＋ , Fe^2＋ , Fe^3＋ Fe^2＋ ration,0C ,TP and grain size, redox environment and the relationship among them were discussed. The result showed the vertical distribution of 0C, Fe^3＋ , Fe^3＋/Fe^2＋ and TP tend to decrease from surface to bottom, Fe^2＋ was increased from surfacs to bottom in these zones. Based on these results of active iron and Fe^3＋/Fe^2＋ , the main redox environmental characteristics is relatively weak oxidation in upper layers and is reduced from 40cm to bottom （CDS ：20cm -75cm）. The difference between them was controlled by the 0C ,TP, grain size and complicated hydrodynamic environment. There is relation between the con centrations of active iron and scdiment grain size,0C ,TP. The redox interface is （defermined）accordig, the borderline of the high and middle tidal flat.
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