Seasonal variations of riverine organic carbon contents in Makou and Hekou gauge stations of the Zhujiang River, China |
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Authors: | Quan-zhou Gao Cheng-de Shen Yan-min Sun Wei-xi Yi Jia-mo Fu Guo-ying Sheng |
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Institution: | (1) Department of Geography, Zhongshan University, 510275 Guangzhou, P. R. China;(2) Guangzhou Institute of Geochemistry, the Chinese Academy of Science, 510640 Guangzhou, P. R. China |
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Abstract: | Water samples were collected and analyzed in high water season (July 1997) and in middle water season (October, 1997) from
two main lower reach gauge stations of the Zhujiang (Pearl) River, namely Hekou and Makou, respectively. Content of particulate
organic carbon is always higher than that of dissolved organic carbon in both seasons, which is obviously different from the
global average pattern, i.e. dissolved organic carbon is the dominant component of the transported riverine organic carbon.
The content of dissolved and particulate organic carbon changes with the water levels in a direct ratio. The percentage of
organic carbon in total suspended substance changes with the content of total suspended substance in an inverse ratio. The
more intense is the soil erosion in the drainage, the more concentrated is the riverine organic carbon in the river. The contribution
of autochthonous organic carbon is large in high water season than in middle water season.
Fundation item: This project was supported financially by the National Natural Science Foundation of China (No. 49901002),
the key funds of resources and eco-environmental research of the CAS (No. KZ952-J1-402), a funds of the state key laboratory
of organic geochemistry, and Guangdong Province Science Funds (No. 984131).
Biography: Gao Quan-zhou (1965 —), male, a native of Anhui Province, associate professor. His research interests are geomorphology
and Quaternary geochemistry. |
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Keywords: | organic carbon flux seasonal variation soil erosion Zhujiang River |
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