江苏沿海港口沉积物的营养元素及成因分析

江苏沿海港口沉积物中营养物质的特征在区域上，氮磷的含量呈现南北部较高，中部稍低的现象；在物质组成上，有机质和氮磷在粘土质沉积物中明显高于粉砂质沉积物，特别是氮磷的有效态更加突出。沉积物中的有机质与氮磷的总量和有效态相关性较好，显示氮磷主要来自有机物质的贡献。C／N、C／P比值表明碳主要是陆地来源的，TOC／TN—TOC／TP图解显示大多数港口受到人类输入物质的影响，而生活污水和工业废水来源的投点范围有别于开阔海沉积物。为防止江苏港口海域的富营养化，应该控制生活污水和工业污水的直接排放。

Nutrients of sediments and their origin in inshore harbors of Jiangsu province

This paper elucidates the characteristics of nutrient elements for sediments from sea harbors of Jiangsu province. Sources of nutrient elements are analyzed on the basis of chemical indexes. The concentrations of nitrogen and phosphorus are higher in the north and the south of Jiangsu coast. Organic matter, nitrogen and phosphorus in clay sediments are higher than those in silt sediments, especially for the effective form of nitrogen and phosphorus. The concentration of organic matter in sediments is well correlative with that of nitrogen and phosphorus, including the total content and the effective form, which displays the contribution of organic matter to nitrogen and phosphorus. The ratios of C/N and C/P imply that the carbon mainly come from rivers and lands. The diagram of TOC/TN vs TOC/TP shows the anthropogenic inputs for most of harbors. There have the obvious differences of plots in diagram for municipal sewage and industrial wastes, which discriminate plots of open sea sediments. We should reduce the discharge of sewage from living and industry in order to prevent the eutrophication of sea area nearby harbors.