| 南沙群岛珊湖礁潟湖垂直沉降颗粒物中主要元素的生物地球化学过程研究 |
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| 引用本文： | 宋金明,李鹏程.南沙群岛珊湖礁潟湖垂直沉降颗粒物中主要元素的生物地球化学过程研究[J].海洋学报,1998,20(4):52-59. |
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| 作者姓名： | 宋金明 李鹏程 |
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| 作者单位： | 中国科学院海洋研究所 |
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| 摘 要： | 本文首次报道用沉积物捕捉器（ＳＴ）研究南沙群岛珊瑚礁湖沉降颗粒物中主要元素垂直通量、垂直转移形态、再循环过程及垂直通量与表层海水温度的关系。结果显示，作为生物化学沉积标志的Ｃａ、Ｍｇ具有最高的垂直通量，达１．４和０．１ｇ／（ｍ２·ｄ）以上，作为生物富集标志的Ｂｒ、Ⅰ也有较高的垂直转移量；垂直转移形态的研究表明Ｎａ、Ｋ、Ｃａ、Ｍｇ、Ｓｒ主要以碳酸盐结合态向海底转移，其中Ｃａ、Ｍｇ、Ｓｒ占９９％以上，Ｆｅ、Ｉ、Ｂａ主要以铁锰氧化物结合态向海底输送，在垂直沉降颗粒物到达海底后，有相当部分的主要元素可再循环进入水体中，Ｂｒ、Ｉ、Ｋ、Ａｌ的绝大部分进入再循环，Ｍｇ、Ｎａ、Ｃｌ有一半左右进入再循环，Ｃａ、Ｓｒ、Ｂａ、Ｆｅ大部分被埋葬；Ｎａ等９种元素的垂直转移量随ＳＳＴ呈指数降低响应，对ＳＳＴ的敏感性Ｆｅ＞Ｂｒ＞Ｓｒ＞Ｃａ＞Ｎａ＞Ｃｌ＞Ｍｇ＞Ｉ＞Ａｌ，这再一次验证了ＣａＣＯ３随温度升高，其溶解度降低、化学沉积量增加这一自然界的普遍规律，表明在珊瑚礁海水的垂直沉降颗粒物中主要元素是作为珊瑚的重要成分与ＣａＣＯ３一同被沉积下来的，ＣａＣＯ３起到稀释剂的作用。
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| 关 键 词： | 主要元素，垂直沉降颗粒物，垂直通量，生物地球化学过程，南沙群岛珊瑚礁潟湖 |
| 收稿时间： | 1996/7/12 0:00:00 |
| 修稿时间： | 1996/10/15 0:00:00 |
Biogeochemical process of major elements in sinking particulate of Nansha coral reef lagoons, the South China Sea |
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| Song Jinming and Li Pengcheng.Biogeochemical process of major elements in sinking particulate of Nansha coral reef lagoons, the South China Sea[J].Acta Oceanologica Sinica (in Chinese),1998,20(4):52-59. |
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| Authors: | Song Jinming and Li Pengcheng |
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| Institution: | Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071 |
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| Abstract: | -Biogeochemical process of major elements has been systematically studied in sinking particulate of Nansha coral reef lagoons, the South China Sea. The main results are as follows: The contents and vertical fluxes of major elements in Nansha coral reef lagoons were different. Vertical fluxes of most major elements in Yongshu Reef lagoon were higher than those in Zhubi Reef lagoon. Ca has the highest flux, about 1.4 g/ (m2.d).Na, K, Ca, Mg and Sr were transferred onto sea floor mainly in carbonate in Yongshu Reef lagoon, Fe, I and Ba in iron-manganese oxide. and Al, Br in silicate, Cl transformation tended to be in the forms of carbonate and silicate. Most of Br, K, Al, I in sinking particulate can recycle into seawater, half of total Mg, Na and Cl can be released into seawater. Most of Ca, Sr, Ba and Fe can be really precipitated into sediment. The order of precipitation ratio was Ca>Mg>I>Al>Br>K. Vertical fluxes of major ele- ments have close relationship with SST. Na and other R elements decreased exponentially with SST, but K and Ba had not the relationship. The order of sensitivities to SST was Fe>Br>Sr>Ca>Na>Cl>Mg>I>Al. The vertical flux changes of Fe and Br can react SST variation. |
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| Keywords: | Major elements sinking particulate biogeochemical process Nansha coral reef lagoons |
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