Particulate silicon in the Changjiang Estuary and its adjacent sea in spring

CAO Lu; LIU Su-mei; LI Rui-xiang

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CAO Lu, LIU Su-mei, LI Rui-xiang. Particulate silicon in the Changjiang Estuary and its adjacent sea in spring[J]. Haiyang Xuebao, 2011, 33(1): 83-90.

Citation:

CAO Lu, LIU Su-mei, LI Rui-xiang. Particulate silicon in the Changjiang Estuary and its adjacent sea in spring[J]. Haiyang Xuebao, 2011, 33(1): 83-90.

CAO Lu, LIU Su-mei, LI Rui-xiang. Particulate silicon in the Changjiang Estuary and its adjacent sea in spring[J]. Haiyang Xuebao, 2011, 33(1): 83-90.

Citation:

CAO Lu, LIU Su-mei, LI Rui-xiang. Particulate silicon in the Changjiang Estuary and its adjacent sea in spring[J]. Haiyang Xuebao, 2011, 33(1): 83-90.

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Particulate silicon in the Changjiang Estuary and its adjacent sea in spring

1.
Key Laboratory of Ministry of Education for Marine Chemistry Theory and Technology, Ocean University of China, Qingdao 266100, China
2.
Key Laboratory of State Oceanic Administration for Marine Ecologic Environmental Science and Engineering, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2010-01-11

Abstract

Abstract

Suspended particulate matter (SPM) was collected to measure the particulate biogenic (PBSi) and lithogenic (LSi) silica content during May 2003 in the Changjiang Estuary and its adjacent sea.Mesocosm experiments were carried out to discuss the distribution and variation of PBSi and relationships between the PBSi content and other environmental factors. Contents of PBSi and LSi vary from 0.22 to 4.25μmol/dm³ and 1.75 to 184 μmol/dm³, respectively. The content of LSi is much higher than that in the other regions of the world, however, the content of PBSi is at in middle level. Both the contents of PBSi and LSi show higher values in the coastal areas than offshore areas, due to terrigenous input from the Changjiang River. In addition, both the values of PBSi and LSi contents in bottom waters are higher than those in surface waters because of the resuspended SPM. PBSi content is closely related to silicate and SPM. Throughout the sampling period, dinoflagellates was bloom and only a small amount of PBSi was bound to identifiable diatom cells, so the distribution of Chl a was different from that of PBSi. During the mesocosm experiments, the different concents of nutrients were added. The biomass of diatom increases with PO^3-₄ addition, followed by the higher content of PBSi. LSi content in the mesocosm experiments was mainly determined by SPM, while nutrients had no distrinct influence on the LSi content.
- particulate biogenic silica,
- lithogenic silica,
- distribution,
- mesocosm experiments,
- Changjiang Estuary

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References(31)

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