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Carbon Nitrogen Isotope Coupling of Soils and Seasonal Variation Characteristics in a Small Karst Watershed in Southern China

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  • Ya Liu

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

  • Ziqi Liu

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

  • Kangning Xiong

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

  • Yuan Li

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

  • Xiaoxi Lyu

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

  • Lulu Cai

    (School of Karst Science, Guizhou Normal University, Guiyang 550001, China
    State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)

Abstract

Carbon and nitrogen are among the most important biogenic elements in terrestrial ecosystems, and carbon and nitrogen stable isotopes (δ 13 C and δ 15 N) are often used to indicate the sources of carbon and nitrogen elements and turnover processes, and the study of C and N isotopes coupling can provide more precise indications. To this end, this study was conducted to investigate the effects of different land use types on soil organic carbon (SOC), soil organic nitrogen (SON) and the coupling relationship of C-N isotopes, as well as to reveal the seasonal variation characteristics of soil C and N. The results showed that SOC and SON contents of forest land were significantly higher than those of agricultural land and grassland. The soil C/N was significantly higher in the dry season than in the rainy season ( p < 0.01), indicating that the decomposition rate of soil organic matter (SOM) was faster in the rainy season, which was not conducive to the accumulation of soil C. Soil δ 13 C and δ 15 N coupling showed seasonal characteristics: soil δ 13 C and δ 15 N did not have a good linear relationship in the rainy season, but showed a significant positive correlation in the dry season (r 2 = 0.75, p < 0.05), indicating that there are differences in the soil C-N isotope fractionation coupling under the influence of climatic factors. This study provides a reference for regional land resource management as well as carbon and nitrogen cycle studies in karst areas.

Suggested Citation

  • Ya Liu & Ziqi Liu & Kangning Xiong & Yuan Li & Xiaoxi Lyu & Lulu Cai, 2023. "Carbon Nitrogen Isotope Coupling of Soils and Seasonal Variation Characteristics in a Small Karst Watershed in Southern China," Land, MDPI, vol. 12(2), pages 1-14, February.
    • Handle: RePEc:gam:jlands:v:12:y:2023:i:2:p:501-:d:1072004
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    1. Aleksandra Perčin & Ivana Šestak & Ivan Dugan & Milan Mesić & Ivica Kisić & Marina Baričević & Željka Zgorelec, 2023. "Isotopic Signatures of Nitrogen in Selected Soils from Croatia," Sustainability, MDPI, vol. 15(23), pages 1-13, November.

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