The Organic Carbon Weathering Fluxes in Xijiang River Basinage

GAO Quan zhou; SHEN Cheng de; SUN Yan min; YI Wei xi

Riverine water samples were collected from the lower reach hydrometric station of Xijiang River, namely Makou, in four hydrological seasons. The samples were analyzed of their organic carbon. The analysis results demonstrated that the distribution of organic carbon, including particulate organic carbon (POC) and dissolved organic carbon (DOC), is fairly suitable in the sampling section in every season. The contents of organic carbon and total suspended substance (TSS) in riverine water body varied seasonally with the discharge in a positive pattern. With the content of total suspended substances increasing, the quality partition of organic carbon in TSS decreased in a logarithm tendency. The weathering flux of organic carbon in Xijiang River drainage area is about 10.18×10 6gC/km ²·yr., which is two to three times in quantiy of the average value in the global external drainage area. The POC is the main constitute of the riverine organic carbon, which weathering flux is about 8.30×10 6gC/km ²·yr. The weathering flux of dissolved organic carbon is about 1.88×10 6gC/km ²·yr. The mechanical erosion is very intense in this drainage area, which is considered to be related to the typical monsoon climate and to the comparatively great undulation of the landforms in this drainage basin. The long history and fairly intense utility of the land for agriculture use are all responsible for the serious soil erosion in this area.

The Organic Carbon Weathering Fluxes in Xijiang River Basinage

1. Department of Geography, Zhongshan University, Guangzhou 510275;

2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640

Received Date: 1999-10-25

Rev Recd Date: 2000-02-01

Publish Date: 2000-08-10

Key words:

Abstract: Riverine water samples were collected from the lower reach hydrometric station of Xijiang River, namely Makou, in four hydrological seasons. The samples were analyzed of their organic carbon. The analysis results demonstrated that the distribution of organic carbon, including particulate organic carbon (POC) and dissolved organic carbon (DOC), is fairly suitable in the sampling section in every season. The contents of organic carbon and total suspended substance (TSS) in riverine water body varied seasonally with the discharge in a positive pattern. With the content of total suspended substances increasing, the quality partition of organic carbon in TSS decreased in a logarithm tendency. The weathering flux of organic carbon in Xijiang River drainage area is about 10.18×10 6gC/km ²·yr., which is two to three times in quantiy of the average value in the global external drainage area. The POC is the main constitute of the riverine organic carbon, which weathering flux is about 8.30×10 6gC/km ²·yr. The weathering flux of dissolved organic carbon is about 1.88×10 6gC/km ²·yr. The mechanical erosion is very intense in this drainage area, which is considered to be related to the typical monsoon climate and to the comparatively great undulation of the landforms in this drainage basin. The long history and fairly intense utility of the land for agriculture use are all responsible for the serious soil erosion in this area.

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The Organic Carbon Weathering Fluxes in Xijiang River Basinage

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