| 冲绳海槽北部表层沉积物中放射虫的分布与环境 |
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| 引用本文： | 常凤鸣,庄丽华,李铁刚,阎军.冲绳海槽北部表层沉积物中放射虫的分布与环境[J].海洋地质与第四纪地质,2002,22(2):21-25. |
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| 作者姓名： | 常凤鸣 庄丽华 李铁刚 阎军 |
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| 作者单位： | 中国科学院,海洋研究所,青岛,266071 |
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| 基金项目： | 国家自然科学基金重点资助项目 (7943 62 10 )，国家重点基础研究发展规划项目 (G2 0 0 0 0 467) |
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| 摘 要： | 对冲绳海槽北部80个表层沉积样品中放射虫进行的定量研究表明，其丰度和分异度西北部低，东南部高，由西北向东南递增；从西北陆架到东南海槽放射虫分布可分为陆架低值区，海槽边缘中值区和中央高值区，放射虫的组成以泡沫虫目占绝对优势，总体面貌为热带大洋暖水动物群，沉积物中放射虫的分布与现代表层海水温度，盐度的分布和变化趋势一致，但与营养盐和实级生产力的分布呈负相关关系；同时，放射虫的分布又与研究区的海流和水团有密切关系，其中黑潮对其有控制性影响，沉积物类型极大地影响着放射虫的分布，放射虫的丰度和分异度明显地随粒度的增大和陆源物质含量的增加而减小，此外，放射虫的分岂有此理也显示了与沉积物中火山物质含量的密切相关性。
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| 关 键 词： | 放射虫 表层沉积物 环境因素 冲绳海槽 营养盐 初级生产力 |
| 文章编号： | 0256-1492(2002)02-0021-05 |
| 修稿时间： | 2001年9月10日 |
RADIOLARIAN DISTRIBUTION IN SURFACE SEDIMENTS OF THE NORTHERN OKINAWA TROUGH AND ITS RELATIONSHIP TO ENVIRONMENTAL FACTORS |
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| CHANG Feng ming,ZHUANG Li hua,LI Tie gang,YAN Jun.RADIOLARIAN DISTRIBUTION IN SURFACE SEDIMENTS OF THE NORTHERN OKINAWA TROUGH AND ITS RELATIONSHIP TO ENVIRONMENTAL FACTORS[J].Marine Geology & Quaternary Geology,2002,22(2):21-25. |
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| Authors: | CHANG Feng ming ZHUANG Li hua LI Tie gang YAN Jun |
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| Abstract: | The quantitative study of radiolarias in surface sediments of 80 stations from the northern Okinawa Trough shows that the radiolarian abundance and diversity are relatively higher in the southeastern part than in the northwestern and markedly increase from northwest to southeast. The radiolarian distribution from the shelf to the Okinawa Trough can be divided into three provinces: the low density zone corresponding to the shelf, the middle density zone corresponding to the margin of the Okinawa Trough and the high density zone corresponding to the central part of the Okinawa Trough. The composition of the dominant radiolarian species is similar in the whole study area, while the compositions of radiolarian assemblages are mildly different among the three provinces. For this study, a total of 190 Spumellaria and Nassellaria radiolarian species is identified and counted, and the radiolarian assemblage in the northern Okinawa Trough is dominated by Spumellarian species and character of the warm water fauna. The distribution of radiolarias covaries with present day sea surface temperature and salinity, but shows negative relationship with nutrients and primary productivity of the surface water in this area. The radiolarian distribution is clearly correlated with currents and water masses, the Kuroshio Current has an important role in controlling the distribution and composition of radiolarias. The distribution pattern is also strongly affected by the sediment type, and radiolarian abundance and diversity decrease with the increase of grain size and terrigenous material input. The direct correlation between the radiolarian preservation and the abundance of volcanic glass has been found in this area studied. |
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| Keywords: | radiolaria distribution and composition environmental factors the Okinawa Trough |
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