| 摘要: |
| 于1993年和1994年用沉积物捕捉器采集南沙永暑礁和诸碧礁内的沉降颗粒物，用中干活化法分析兀素的含量并计算通量，通过对生源要素的统计相关分析、垂直沉降颗粒物中的元素比、非生源要素在泻湖中的停留时间的探讨，研究了南沙珊瑚礁生态系中元素的垂直转移途径。结果表明，在南沙珊瑚礁泻湖中元素的停留时间较海水中短，元素的循环速率高，且尤以与生物作用有关的元素为甚；颗粒物中非生源要素的垂直转移主要是通过生物过程完成的，其转移量可达80％以上，表明珊瑚礁生态系中非生源元素与生源元素有相似的垂直转移机制。 |
| 关键词: 非生源元素 南海 垂直转移途径 沉降颗粒物 南沙珊瑚礁生态系 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49576291 |
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| PATHS OF ELEMENT VERTICAL TRASPORT IN THE NANSHA CARAL REEF ECOSYSTEM, SOUTH CHINA SEA |
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SONG Jin-ming
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Institute of Oceanology,the Chinese Academy of Science,Qingdao,266071
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| Abstract: |
| Settling particulates were sampled by sediment traps deployed in the lagoons of Zhubi and Yongshu reefs in 1993 and 1994, Nansha Islands Waters, the South China Sea. The elemental concentrations in particles were determined with the method of neutron active analysis. Statistical relationship between biogenic and abiogenic elements, elemental ratios in settling particles and the residence time of abiogenic elements in coral reef lagoons show that: 1) most of abiogenic elements are directly proportional to biogenic elements (such as organic carbon, nitrogen or phosphorus) in terms of concentrations or vertical fluxes of settling particles, the correlation coefficients being more than ±0.85; 2) a number of elemental ratios can be used to illustrate the origin of material e.g. by using the ratios of Co/La, the origin of settling particles can be studied, the authigenic biogenic parts accounts for 95.7% and 94.3%, during the cruise 93–5 and 94–4 in Zhubi reef lagoon respectively, and 83.7% during the cruise 1993–1994 in Yongshu reef lagoon, indicating that, the vertical transport magnitude by biological process accounts for more than 80% of abiogenic elements; 3) the residence time was smaller in coral reef lagoons than in seawaters, the residence time of Zr, Ti, Fe, Al, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu in Nansha coral reef lagoons are from several days to hundred days, and from several years to thousands years for the other abiogenic elements; as a result, the abiogenic elements cycling rates are high in lagoons.
According to the above results, the vertical transport mechanism of abiogenic elements is the same as biogenic elements. |
| Key words: Abiogenic element, South China Sea, Path of vertical transport, Settling particulates, Nansha coral reef ecosystem |
