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用沉积物捕捉器(ST)研究了南沙珊瑚礁生态系中Zr,Hf等18种稀有元素的颗粒垂直转移量、稀有元素的转移形态、稀有元素垂直转移量与海水温度的关系.结果显示,大部分元素在永暑礁泻湖的垂直转移量高于渚碧礁泻湖,永暑礁内垂直沉降颗粒物中的大部分稀有元素以碳酸盐的形式向海底转移,但Ta,As,Th是主要以离子交换态,Ag主要以铁猛氧化物结合态,Sb以有机态硫化物态向海底转移,这18种稀有元素没有一种主要以硅酸盐碎屑态形式向海底转移,这表明稀有元素从陆地进入海洋后在颗粒物中元素进行了重新分配.稀有元素的垂直转移量还与海水温度密切有关,对表层海水温度的敏感性Rb>V>As>Ti>U>Zn>Sb>Hf>Ag>Cs.
Sediment traps (ST) were used to study the relationship between the vertical transfer of 18 rare elements such as Zr and Hf in the Nansha coral reef ecosystem, the transfer of rare elements, the vertical transfer of rare elements and the seawater temperature. The vertical transfer of some elements in the Yongshuijiao Lagoon was higher than that in the Zhubiku Lagoon. Most of the vertically-falling particulate matter in the Yongshu reef migrated to the seafloor in the form of carbonate, but Ta, As and Th were mainly In the ion exchange state, Ag is mainly in the form of an iron-sulphide bond and Sb is translocated to the seafloor in the form of an organic sulphide. None of the 18 rare elements are mainly transported to the seafloor in the form of silicate detritus, indicating that the rare element The redistribution of the elements in the particulate matter after entering the ocean from the land.The vertical transfer of the rare elements is also closely related to the seawater temperature, and the sensitivity to surface seawater temperature is Rb> V> As> Ti> U> Zn> Sb> Hf> Ag> Cs.