珠江磨刀门河口沉积物中主要离子含量及其分布

The Content and Distribution of Seven Primary Ions in Surface Sediments from Modaomen Estuary of the Pearl River

根据2003年夏季采集的37个磨刀门河口表层沉积物样品,对其中7种阴阳离子(K+、Na+、Ca2+、Mg2+、Cl-、HCO3-、SO42-)的含量及分布特征进行了分析,结果表明,阳离子和阴离子的最大值一般都出现在外海,呈现出由口内河床-拦门沙地区-外海逐渐增大的趋势;其次是拦门沙附近,阴阳离子的含量都普遍高于其他地区,阳离子互相之间具有良好的相关性,阳离子与Cl-以及SO42-这两种阴离子的相关性较好,此外,Cl-和SO42-这两种阴离子之间也具有较好的相关性,其影响因素主要是磨刀门河口的水体盐度、沉积物粒度、河口咸淡水混合作用、海洋动力作用和物质来源等。

By 37 representative samples of surface sediments collected from Modaomen Estuary of the Pearl River in the summer of 2003, the content and distribution characteristics of 7 kinds of major ions, including K^＋、Na^＋、Ca^2＋、Mg^2＋、Cl^-、CO3^2- ,HCO3^- and SO4^2- , are analyzed. The results show that ： the maximums of the anions and cations occur generally in outer seas, and the distribution characteristics of their contents present the increasing gradually trend from the watercourse to the estuary to the open-sea; their contents near the Sand Bar are higher than those in other areas; the relativities between cations and between cations and Cl^- or SO4^2-, as well as between Cl^- and SO4^2- , are good. The influencing factors are mainly the following： the of seawater and granularity of sediment in Mo Daomen Estuary, the effect of the briny water and freshwater mixing, the motivity process of the sea, and the matter source, etc.