| GAO Jianhua,WANG Yaping,PAN Shaoming,ZHANG Rui,LI Jun,BAI Fenglong. 2008. Distribution of organic carbon in sediments and its influences on adjacent sea area in the turbidity maximum of Changjiang Estuary in China. Acta Oceanologica Sinica, (4):83－94 |
| Distribution of organic carbon in sediments and its influences on adjacent sea area in the turbidity maximum of Changjiang Estuary in China |
| Distribution of organic carbon in sediments and its influences on adjacent sea area in the turbidity maximum of Changjiang Estuary in China |
| Received:June 01, 2007 Revised:October 16, 2007 |
| DOI： |
| Key words:total organic carbon total nitrogen stable carbon isotope hydrodynamics chlorophyll a Changjiang Estuary |
| 中文关键词: total organic carbon total nitrogen stable carbon isotope hydrodynamics chlorophyll a Changjiang Estuary |
| 基金项目:The Special Fund from the National Key Basic Research Program of China under contract No. 2002CB412401 and the National Natural Science Foundation of China under contract Nos 40506022 and 40506013. |
| Author Name | Affiliation | E-mail | | GAO Jianhua | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | jhgao@nju.edu.cn | | WANG Yaping | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | | | PAN Shaoming | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | | | ZHANG Rui | Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China | | | LI Jun | Qingdao Institute of Marine Geology, Qingdao 266071, China | | | BAI Fenglong | Qingdao Institute of Marine Geology, Qingdao 266071, China | |
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| Abstract: |
| Distributions and sources of total organic carbon(TOC)in seabed sediments and their implications for hydrodynamics are analyzed, in the turbidity maximum of the Changjiang Estuary. Ecology ecoenvironmental effects of estuary water on the continuously increasing terrigenous organic carbon from the Changjiang River are also explored through variations of organic carbon content and water quality indicators. Results show that, hydrodynamics exert important influences on distributions of organic carbon in the turbidity maximum of Changjiang Estuary. For their redistribution effect of terrigenous organic carbon within the moving layer in the whole region, variations from land to sea are not indicated by surficial and vertical average values of TOC and total nitrogen (TN) contents in core sediment, as well as organic stable carbon isotopes in surface sediments. However, on the long-time scale, the trend of terrigenous organic carbon decreasing from land to sea is still displayed by variations of stable carbon isotopic average values becoming heavier from land to sea. Previous studies have shown that high content of Chl a cannot appear in the Changjiang Estuary in despite of adequate nourishment supply, because photosynthesis of phytoplankton is constrained by high suspended sediment concentration(SSC). However, an area with a high content of Chl a occurs, which may be caused by resuspended benthic algae with bottom fine grain-size sediments. Tremendous pressures are imposed on the environment of Changjiang Estuary, because of ultrophication trends and special hydrodynamics. Phytoplankton bloom area tends to extend from the outer sea to the mouth of Changjiang River. |
| 中文摘要: |
| Distributions and sources of total organic carbon(TOC)in seabed sediments and their implications for hydrodynamics are analyzed, in the turbidity maximum of the Changjiang Estuary. Ecology ecoenvironmental effects of estuary water on the continuously increasing terrigenous organic carbon from the Changjiang River are also explored through variations of organic carbon content and water quality indicators. Results show that, hydrodynamics exert important influences on distributions of organic carbon in the turbidity maximum of Changjiang Estuary. For their redistribution effect of terrigenous organic carbon within the moving layer in the whole region, variations from land to sea are not indicated by surficial and vertical average values of TOC and total nitrogen (TN) contents in core sediment, as well as organic stable carbon isotopes in surface sediments. However, on the long-time scale, the trend of terrigenous organic carbon decreasing from land to sea is still displayed by variations of stable carbon isotopic average values becoming heavier from land to sea. Previous studies have shown that high content of Chl a cannot appear in the Changjiang Estuary in despite of adequate nourishment supply, because photosynthesis of phytoplankton is constrained by high suspended sediment concentration(SSC). However, an area with a high content of Chl a occurs, which may be caused by resuspended benthic algae with bottom fine grain-size sediments. Tremendous pressures are imposed on the environment of Changjiang Estuary, because of ultrophication trends and special hydrodynamics. Phytoplankton bloom area tends to extend from the outer sea to the mouth of Changjiang River. |
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