the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: an isotopic approach
Abstract. The sources and dynamics of riverine carbon have been discussed extensively, but knowledge about the transformation from DIC into organic carbon (OC) is still poorly understood. In this study, we conducted a comprehensive investigation on the riverine carbon, stable carbon isotopic components and C/N ratios for different seasons, including an extreme flood event, in the lower Xijiang and its three tributaries. Detailed analyses are also performed for soil samples across the study region. Downstream increase in δ13CDIC and downstream decrease in both δ13CPOC and C/N have been observed for all the tributaries. Meanwhile, positive shift of δ13CDIC and negative shift of δ13CPOC are also observed from summer to winter. These observations likely indicate that the isotopic compositions of both DIC and POC are significantly affected by in-river primary production that converts DIC into organic matter through photosynthesis. It is estimated that the percentage contribution of the riverine aquatic primary production to the riverine POC in the Xijiang and three tributaries of Guijiang, Hejiang and Luoding is respectively 7.1%, 43.2%, 36.4% and 9.9% in rainy season, and 35.6%, 47.3%, 50.3% and 40.1% in dry season. Based on the stoichiometry involved in chemical weathering of the bedrocks, the transformation of the carbonate-sourced DIC to POC is further quantified to be 3.4–20.5% in rainy season, and 12.3–22.1% in dry season. This may suggest an important sink of atmospheric CO2 in river systems that was largely ignored previously.
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RC C3883: 'comments on "transformation of DIC into POC in the xiajiang river"', Anonymous Referee #1, 26 Oct 2011
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AC C4635: 'Reply to anonymous referee #1', Jingtai Han, 01 Dec 2011
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AC C4635: 'Reply to anonymous referee #1', Jingtai Han, 01 Dec 2011
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RC C4605: 'Comments on “Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: an isotopic approach” by H. G. Sun et al.', Anonymous Referee #2, 28 Nov 2011
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AC C4742: 'Reply to anonymous referee #2', Jingtai Han, 07 Dec 2011
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AC C4742: 'Reply to anonymous referee #2', Jingtai Han, 07 Dec 2011
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EC C5156: 'Comment on “Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: An isotopic approach” by H. G. Sun, J. T. Han, S. R. Zhang, and X. X. Lu.', Leticia Cotrim da Cunha, 04 Jan 2012
- Printer-friendly version
- Supplement
-
RC C3883: 'comments on "transformation of DIC into POC in the xiajiang river"', Anonymous Referee #1, 26 Oct 2011
-
AC C4635: 'Reply to anonymous referee #1', Jingtai Han, 01 Dec 2011
-
AC C4635: 'Reply to anonymous referee #1', Jingtai Han, 01 Dec 2011
-
RC C4605: 'Comments on “Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: an isotopic approach” by H. G. Sun et al.', Anonymous Referee #2, 28 Nov 2011
-
AC C4742: 'Reply to anonymous referee #2', Jingtai Han, 07 Dec 2011
-
AC C4742: 'Reply to anonymous referee #2', Jingtai Han, 07 Dec 2011
-
EC C5156: 'Comment on “Transformation of dissolved inorganic carbon (DIC) into particulate organic carbon (POC) in the lower Xijiang River, SE China: An isotopic approach” by H. G. Sun, J. T. Han, S. R. Zhang, and X. X. Lu.', Leticia Cotrim da Cunha, 04 Jan 2012
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Cited
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- Transformation of DIC into POC in a karst river system: evidence from δ13CDIC and δ13CPOC in Lijiang, Southwest China H. Zhao et al. 10.1007/s12665-020-09039-7
- Influence of the biological carbon pump effect on the sources and deposition of organic matter in Fuxian Lake, a deep oligotrophic lake in southwest China H. He et al. 10.1007/s11631-019-00359-5
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