| Potential impacts of Three Gorges Dam in China on the ecosystem of East China Sea |
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| 作者姓名： | WANG Baodong BROCKMANN Uwe |
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| 作者单位： | [1]First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China [2]Institute of Biogeochemistry ＆ Marine Chemistry, University of Hamburg, Hamburg 20146, Germany |
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| 基金项目： | The National Key Basic Research Program of Ministry of Science and Technology of China under contract No.2001CB4097 and the Foundation of Key Laboratory of Marine Ecosystem and Biogeochemistry of State Oceanic Administration of China under contract No.LMEB200603. |
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| 摘 要： | The Changjiang River in China was dammed in 2003. The possible changes in matters fluxes from the river downstream after the completion of Three Gorges Dam and their potential impacts on the ecosystem of the East China Sea are discussed . The estuarine and coastal waters in the East China Sea were heavily fertilized by the inflow of nutrient-rich freshwater from the Changjiang River, which has led to severe eutrophication and frequent harmful algal blooms ,thus worsening the ecosystem health in this area. Analy- sis showed that the nutrient loadings are very likely to be reduced in the lower Changjiang River due to the construction of Three Gorges Dam. Especially for the total phosphorus, the discharges to the East China Sea will be reduced by one-third, which would relieve the severe eutrophication in this area. However, the expected decrease in the riverine silicate discharge would lead the ratio of silicon to nitrogen to be much less than 1 in the estuarine and coastal waters and thus may cause an elevation of flagellate growth. The changes in the annual water discharges and their seasonal distributions below the dam will be minor. Reduction of suspended particulate matter loading, due to the sedimentation behind the dam, will reduce the nutrient loadings of the particulate form especially for phosphorus, and decrease the turbidity of estuarine and coastal waters. On the other hand, this may enhance the erosion of the delta and the coasts as well as modifythe benthic ecosystem.
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| 关 键 词： | 三峡水坝 流量 超营养作用 生态系统 长江 东中国海 |
| 收稿时间： | 2006/11/19 0:00:00 |
| 修稿时间： | 2007/6/12 0:00:00 |
Potential impacts of Three Gorges Dam in China on the ecosystem of East China Sea |
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| WANG Baodong,BROCKMANN Uwe.Potential impacts of Three Gorges Dam in China on the ecosystem of East China Sea[J].Acta Oceanologica Sinica,2008,27(1):67-76. |
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| Authors: | WANG Baodong and BROCKMANN Uwe |
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| Institution: | 1.First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China2.Institute of Biogeochemistry & Marine Chemistry, University of Hamburg, Hamburg 20146, Germany |
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| Abstract: | The Changjiang River in China was dammed in 2003.The possible changes in matters fluxes from the river downstream after the completion of Three Gorges Dam and their potential impacts on the ecosystem of the East China Sea are discussed.The estuarine and coastal waters in the East China Sea were heavily fertilized by the inflow of nutrient-rich freshwater from the Changjiang River, which has led to severe eutrophication and frequent harmful algal blooms,thus worsening the ecosystem health in this area.Analy- sis showed that the nutrient loadings are very likely to be reduced in the lower Changjiang River due to the construction of Three Gorges Dam.Especially for the total phosphorus,the discharges to the East China Sea will be reduced by one-third,which would relieve the severe eutrophication in this area.However,the expected decrease in the riverine silicate discharge would lead the ra- tio of silicon to nitrogen to be much less than 1 in the estuarine and coastal waters and thus may cause an elevation of flagellate growth.The changes in the annual water discharges and their seasonal distributions below the dam will be minor.Reduction of suspended particulate matter loading,due to the sedimentation behind the dam,will reduce the nutrient loadings of the particulate form especially for phosphorus,and decrease the turbidity of estuarine and coastal waters.On the other hand,this may enhance the erosion of the delta and the coasts as well as modifythe benthic ecosystem. |
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| Keywords: | Three Gorges Dam nutrient flux Changjiang River East China Sea ecosystem eutrophication |
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