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Li Siyuan, Hou Qingye, Yang Zhongfang, Yu Tao. 2024. Nitrogen isotope fractionation mechanism, analysis measurement tracer technology and its application in ecological environment[J]. Geology in China, 51(5): 1617−1643. DOI: 10.12029/gc20230910002
Citation: Li Siyuan, Hou Qingye, Yang Zhongfang, Yu Tao. 2024. Nitrogen isotope fractionation mechanism, analysis measurement tracer technology and its application in ecological environment[J]. Geology in China, 51(5): 1617−1643. DOI: 10.12029/gc20230910002

Nitrogen isotope fractionation mechanism, analysis measurement tracer technology and its application in ecological environment

Funds: Supported by the National Natural Science Foundation of China (No.41773019).
More Information
  • Author Bio:

    LI Siyuan, female, born in 1998, master candidate, majors in environmental geochemistry research; E-mail: 601321603@qq.com

  • Corresponding author:

    HOU Qingye, female, born in 1978, professor, majors in environmental geochemistry research; E-mail: qingyehou@cugb.edu.cn.

  • Received Date: September 09, 2023
  • Revised Date: January 28, 2024
  • This paper is the result of environmental geological survey engineering.

    Objective 

    Nitrogen (N) is a key nutrient across Earth's terrestrial ecosystems and one of the pollution elements that cause water eutrophication. Owing to the continuous improvements of analysis and testing techniques, nitrogen stable isotope technology has developed into a common research method and analysis mean, and has been widely used in nitrogen biogeochemical cycle, water eutrophication and groundwater pollution source identification.

    Methods 

    In this paper, the relevant literatures on nitrogen stable isotope in the field of ecological environment domestic and overseas in recent years were reviewed, and the research status of nitrogen isotope fractionation mechanism, nitrogen stable isotope analysis technology and nitrogen isotope applications in ecological environment were summarized, the development of remediation technologys of nitrate pollution in groundwater were briefly described.

    Results 

    (1) A mature system of nitrogen isotope mass spectrometry and nitrogen isotope tracer technology has been established. (2) Nitrification and denitrification are the main mechanisms of soil nitrogen conversion cycle. Nitrogen input is realized by biological nitrogen fixation, and nitrogen output is mainly through nitrogen gas or ammoniation produced by plants or microorganisms, which is accompanied by different degrees of nitrogen isotope fractionation. (3) Nitrogen isotopes can be used to measure soil nitrogen turnover rates and N2O emission rates, improve biological nitrogen fixation, indicate changes in atmospheric nitrogen deposition, investigate the interaction between plant and soil and determine nitrogen uptake and utilization by plants, and identify crop area sources and pollution in groundwater and atmosphere.

    Conclusions 

    Future researches should focus on improving the ability of quantitative detection of uncertainty sources in the nitrogen cycle, identifying undiscovered nitrogen input, accumulation and loss pathways, and perfecting and developing ecosystem nitrogen cycle model.

    Highlights
    (1) This paper summarizes the principle and development history of nitrogen isotope analysis and testing techniques, the mechanism and influencing factors of nitrogen isotope fractionation, the research status of nitrogen geochemical cycle and the source tracing of nitrogen pollutants. (2) This paper composes and summarizes the international progress of nitrogen isotope application in ecological environment research, especially in soil−plant system, and proposes the main research directions for the future with the aim of providing references for the research and development of nitrogen stable isotope techniques and the expansion of its applications.
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