| Distribution of nutrients and chlorophyll a in the Three-Gorges Reservoir, China |
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| 作者姓名： | 李崇明 张晟 刘景红 魏世强 张勇 高吉喜 |
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| 作者单位： | Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China，Chongqing Institute of Environmental Science Chongqing 400020 China，Chongqing Institute of Environmental Science Chongqing 400020 China，College of Resources and Environment Southwest Agriculture University Chongqing 400716 China，College of Resources and Environment Southwest Agriculture University Chongqing 400716 China，College of Resources and Environment Southwest Agriculture University Chongqing 400716 China，Chongqing Institute of Environmental Science Chongqing 400020 China，College of Resources and Environment Southwest Agriculture University Chongqing 400716 China，Chinese Research Academy of Environment Science Beijing100012 China |
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| 基金项目： | This work was sponsored by Chongqing Municipality Natural Science Foundation （2004BB7075, 2005BB7239 ） and China-haly cooperated project （Survey and Assessment on Ecology in the Three-Gorges Area）.Acknowledgements The authors wish to thank Chongqing Environment Monitoring Center for its partial nutrient analyses, and the Water Environment Monitoring Center for the Upper Reaches of the Yangtze River for its assistance in sampling. |
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| 摘 要： | 1IntroductionUp to now,eutrophication is still a problem af-fecting water quality in many developing countries.Themost important nutrients causing eutrophication arephosphates,nitrates and ammonia(Lijklema,1995;Horne and Goldman,1994).Eutrophic waters are…
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| 关 键 词： | 三峡工程 营养分布 叶绿素 水质监测 |
Distribution of nutrients and chlorophylla in the Three-Gorges Reservoir, China |
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| Li Chongming,Zhang Sheng,Liu Jinghong,Wei Shiqiang,Zhang Yong,Gao Jixi.Distribution of nutrients and chlorophyll a in the Three-Gorges Reservoir, China[J].Chinese Journal of Geochemistry,2006,25(3):295-300. |
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| Authors: | Li Chongming Zhang Sheng Liu Jinghong Wei Shiqiang Zhang Yong Gao Jixi |
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| Institution: | (1) Institute of Hydrobiology, Chinese Academy ofSciences, 430072 Wuhan, China;(2) Chongqing Institute of Environmental Science, 400020 Chongqing, China;(3) College of Resources and Environment, Southwest Agriculture University, 400716 Chongqing, China;(4) Chinese Research Academy of Environment Science, 100012 Beijing, China |
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| Abstract: | The Three-Gorges Reservoir (TGR) is one of the largest water conservancy projects in the world. The status of nutrients and
phytoplankton biomass has changed since the Three-Gorges Reservoir started water storage on June 1, 2003. The distribution
features of nutrients and chlorophylla were determined by cruise monitoring during September 8–15, 2003. The results showed that the concentrations of dissolved
total nitrogen (DTN) range from 1.01 to 1.35 mg L-1, those of dissolved total phosphorus (DTP) from 0.028 to 0.054 mg L-1. The concentrations of dissolved nitrogen and phosphorus exceed the eutrophication standards of OECD, and the ratio of DTN
to DTP is over 16:1. It is shown that phosphorus is an eutrophication-limiting element in the water body. The concentrations
of potassium range from 2. 80 to 3.44 mg L-1; those of total organic carbon from 1.92 to 2.59 mg L-1; those of chlorophylla from 1.58 to 7. 53 mg m-3 with an average value of 4.69 mg m-3 at surface layer. A trophic gradient could be observed from the oligotropher to the mesotropher in the flow direction. Phytoplankton
biomass increased significantly in the reservoir area than before. A significant positive correlation (p < 0. 05,r = 0.728 ) between chlorophylla and NO3-N and a significant negative correlation (p < 0. 01,r = -0.9207) between chlorophylla and turbidity were also observed. Distribution features could be well divided into three clusters in terms of systematic
cluster analyses, including the upper-stream area cluster, the middlestream area cluster and the down-stream area cluster.
This work was sponsored by Chongqing Municipality Natural Science Foundation ( 2004BB7075, 2005BB7239) and China-Italy cooperated
project ( Survey and Assessment on Ecology in the Three-Gorges Area). |
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| Keywords: | Three-Gorges Reservoir nutrient chlorophyll a distribution |
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