Biogenic silica distributions in recent sediments of the East China Sea and the Huanghai Sea and implications for productivity reconstructions

YANG Qian; SUN Yao; WANG Di-di; Xing Lei; SUN Xiao-xia; TANG Qi-sheng

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YANG Qian, SUN Yao, WANG Di-di, Xing Lei, SUN Xiao-xia, TANG Qi-sheng. Biogenic silica distributions in recent sediments of the East China Sea and the Huanghai Sea and implications for productivity reconstructions[J]. Haiyang Xuebao, 2010, 32(3): 51-59.

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Biogenic silica distributions in recent sediments of the East China Sea and the Huanghai Sea and implications for productivity reconstructions

1.
Key Laboratory of Ministry of Education for Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266003, China;Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266007,China
2.
Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Qingdao 266007,China
3.
Key Laboratory of Ministry of Education for Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266003, China
4.
College of Marine Geo-science,Ocean University of China, Qingdao 266003,China

Received Date: 2009-07-06
Rev Recd Date: 2010-02-01

Abstract

Abstract

Surface and core sediment samples were collected during cruises in the East China Sea and the Huanghai Sea in April and October of 2006 to study the spatial distributions of biogenic silicon (BSi) in sediments and to evaluate its potential for productivity reconstructions. The results show that the BSi content of surface sediments is 0.018%~2.516%, averaging 0.726%.The vertical distribution profiles reveal that the BSi content is relatively stable, in accordance with the variations of the contemporary living phytoplankton biomass.A linear regression analysis method was adopted to prove that the BSi content has a positive relationship with the living phytoplankton biomass. To further confirm the applicability and credibility of the reconstruction potential of BSi, the method of Tunnicliffe et al.was used to study the stability of BSi in sediments. The survey indicates that there is almost no degradation of BSi in sediments over the past 150 a.Therefore, it is concluded that BSi in sediments may be used as an index to reconstruct paleoproductivity fluctuations.
- East China Sea and Huanghai Sea,
- sediments,
- biogenic silicon,
- paleoproductivity index

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