Transfer and transport of phosphorus and silica in the turbidity maximum zone of the Changjiang estuary | Health & Environmental Research Online (HERO)

HERO ID

2504940

Reference Type

Journal Article

Title

Transfer and transport of phosphorus and silica in the turbidity maximum zone of the Changjiang estuary

Author(s)

Shen, Z; Zhou, S; Pei, S

Year

2008

Is Peer Reviewed?

Yes

Journal

Estuarine, Coastal and Shelf Science
ISSN: 0272-7714
EISSN: 1096-0015

Publisher

Elsevier Science, P.O. Box 211 Amsterdam 1000 AE

Volume

78

Issue

3

Page Numbers

481-492

Language

English

DOI

10.1016/j.ecss.2008.01.010

Web of Science Id

WOS:000257084000003

URL

https://www.proquest.com/scholarly-journals/transfer-transport-phosphorus-silica-turbidity/docview/20880223/se-2?accountid=171501
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Abstract

The concentration of suspended particulate matter (SPM), sedimentation flux, and various forms of phosphorus and silica in turbidity maximum zone (TMZ) in the Changjiang (Yangtze) estuary was studied. Based on the budget of P and Si, their mass balances in the TMZ were calculated. Results show that the variation in concentration of dissolved inorganic silicon (DISi) was mainly controlled by seawater dilution, while that of dissolved inorganic phosphor-us (DIP) was considerably affected by the buffering of suspended matter and sediment. Our experiments showed that the sedimentation fluxes of SPM and particulate inorganic phosphorus (PIP), total particulate phosphorus (TPP), particulate inorganic silicon (PISi), and biological silicon (BSi) in the TMZ were 238.4 g m(-2) d(-1) and 28.3, 43.1, 79.0, 63.0 mg m(-2) d(-1), respectively. In addition, a simple method to estimate the ratio of resuspension of sediment in the TMZ was established, with which the rate in surface and bottom waters of the TMZ accounted for 55.7 and 66.1% of the total SPM, respectively, indicating that the sediment resuspension in the TMZ influenced significantly the mass balances of P and Si. Particulate adsorbed P (60.8%) and 35.5% of total particulate P discharged from the river were filtered and then deposited in the TMZ. The input flux of PIP from the river mouth was 55.9% of that of DIP, being important as biologically available P, while that of PISi was only 3.5% of DISi, showing that particulate adsorbed Si was much less important than particulate adsorbed P. (c) 2008 Elsevier Ltd. All rights reserved.

Keywords

phosphorus; silica; suspended particulate matter; transport; turbidity maximum zone; China; Changjiang (Yangtze) estuary