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Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

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  • Zhongfa Zhou

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

  • Jie Kong

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

  • Fuqiang Zhang

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

  • Yan Zou

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

  • Jiangting Xie

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

  • Chaocheng Wen

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    School of Geography & Enviromental Science, Guizhou Normal University, Guiyang 550001, China
    The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

Abstract

The hydrochemical analysis method was used to reveal the sources and spatiotemporal variations of carbon and nitrogen elements in the Pingzhai Reservoir, and the C–N coupling cycle and its influence on the karst carbon sink are discussed. The results show the following: (1) The hydrochemical type of the study area is HCO 3 -Ca. (2) From the river to the reservoir and then to the reservoir outlet, the values of HCO 3 − and δ 13 C DIC showed an opposite trend. The values of NO 3 − , δ 15 N-NO 3 − , and δ 18 O-NO 3 − were different in each stage of the river. (3) HCO 3 − mainly comes from the weathering of carbonate rocks and the oxidative decomposition of organic matter. Nitrate mainly comes from chemical fertilizers, soil organic nitrogen, sewage, and livestock manure. (4) The average proportion of HCO 3 − produced by HNO 3 dissolving carbonate rock is 8.38%, but this part does not constitute a carbon sink. Compared with rivers, the proportion of HCO 3 − and (Ca 2+ + Mg 2+ ) produced by HNO 3 dissolving carbonate rock in reservoir water is relatively large. The input of nitrate not only pollutes the water body with NO 3 − but also changes the carbon source/sink pattern of the water–rock interaction.

Suggested Citation

  • Zhongfa Zhou & Jie Kong & Fuqiang Zhang & Yan Zou & Jiangting Xie & Chaocheng Wen, 2023. "Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs," Land, MDPI, vol. 12(2), pages 1-16, February.
    • Handle: RePEc:gam:jlands:v:12:y:2023:i:2:p:429-:d:1059682
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    References listed on IDEAS

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    1. Peter A. Raymond & Neung-Hwan Oh & R. Eugene Turner & Whitney Broussard, 2008. "Anthropogenically enhanced fluxes of water and carbon from the Mississippi River," Nature, Nature, vol. 451(7177), pages 449-452, January.
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