期刊
REGIONAL ENVIRONMENTAL CHANGE
卷 3, 期 1-3, 页码 65-76出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10113-001-0039-3
关键词
Nutrients; Trace elements; Biomarkers; Estuarine and coastal environment; Human drivers; China
资金
- Natural Science Foundation of China (NSFC) [49525609]
- Ministry of Science and Technology [G1999043705]
- LOICZ IPO
The dissolved and particulate trace metals in large and middle-sized Chinese rivers remain comparable with other less-disturbed world systems. Levels of nutrients in Chinese rivers are high due to erosion over the drainage area and the application of chemical fertilizers, which induces an N/P ratio up to 100-1,000. The concentrations of organic pollutants in Chinese rivers are ranked at the lower end of those of world systems; however, pollution has been identified in coastal waters from north to south of the country. In estuarine and coastal waters, dissolved trace metals illustrate a feature of remobilization, while non-conservative distribution is observed, with exceptions for iron and aluminum. Particulate trace metals demonstrate a fairly stable distribution along the salinity gradient, when the absolute concentration is normalized to reference materials. In high-turbidity estuaries, seaward nutrient flux can be increased by a factor of 5-10. Finally, the N/P ratio approaches 10-20 at the interior of the East China Sea, indicating that in coastal regions photosynthesis changes from P to N and Si limitations.
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