| 摘要: |
| 对东海中陆架泥质区及其周边的表层沉积物分别利用容量法、元素分析仪法进行了IC、OC含量分析，利用筛析法和沉降法进行了粒度分析。结果表明，研究区IC含量均明显高于OC含量。OC含量在泥质区高，砂质区低；IC含量分布为：近岸细粒沉积区为相对高值区，中陆架砂质区为低值区，中陆架泥质区为高值区，外陆架砂质区为特高值区。OC富集主要受控于上覆水体的生物生产量、沉积动力环境以及海底物理化学条件。IC的分布受物源影响明显，其富集与该区的环流格局相对应，主要受控于研究区的沉积动力环境和它们的时空变化。研究区的现代海底固碳能力可分为强固碳能力的中陆架泥质区、弱固碳能力的中陆架砂质区和基本无固碳能力的外陆架砂质区。 |
| 关键词: 表层沉积物 有机碳 无机碳 富集规律 海底固碳能力 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目，49676289号及高等院校博士点专项基金 |
附件 |
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| DISTRIBUTION PATTERN OF CARBON STORAGE IN THE SURFICIAL SEDIMENTS IN THE MIDDLE CONTINENTAL SHELF MUD AREA AND ITS ADJOINING EAST CHINA SEA AREAS |
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GUO Zhi-gang, YANG Zuo-sheng, QU Yan-hui, LI Yu-ying, CUI Qing
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College of Marine Geosciences, Ocean University of Qingdao, Qingdao, 266003
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| Abstract: |
| Analyses of grain size using sieve and sedimentation methods (<0.063mm), concentrations of inorganic carbon (IC) using volumetric method and concentrations of organic carbon (OC) using element instrument analysis of 35 surface sediment samples collected from the middle continental shelf mud area and its adjoining East Chain Sea areas in 1987 and 1994 respectively, were carried out. The results show that the middle continental shelf mud area is associated with high concentrations of OC. The OC decreases from the center of the mud area towards its adjacent sand areas. The distribution of concentrations of IC can be divided into 4 subprovinces, namely, relative high IC in the coastal area, low IC in the middle continental shelf sand area, high IC in the middle continental shelf mud area and highest IC in the outer continental shelf sand area. On the basis of the analysis for 11 surficial sediment samples, the concentrations of IC are higher than those of OC. The concentrations of OC is a closely related to the grain size, indicating that the distribution pattern of OC in the surface sediments is mainly controlled by the organism production of the above sea water, the sedimentary dynamic environment in association with the circulation system, and the conditions of physical chemistry on the sea-floor. In contrast, the distribution pattern of IC is related to the support amount of different source of carbon, and has a good correspondence to the distribution of circulation system, indicating that the distribution pattern of IC is mainly controlled by the sedimentary dynamic environment and its spatial and temporal changes, especially the seasonal change in the circulation system of the study area. Based on the ability for modern carbon adsorption of the sea-floor, the study area can be fallen into 3 typical areas, namely, the middle continental shelf mud area with high carbon storage, middle continental shelf sand area with low carbon storage and the outer continental shelf sand area without the storage of carbon. |
| Key words: Surface sediments, Organic carbon, Inorganic carbon, The distribution pattern of carbon, Ability of carbon's catch in the sea-floor |
