亚硝酸盐氮、氧同位素技术及其在海洋氮循环中的应用

地球科学进展 ›› 2021, Vol. 36 ›› Issue (12): 1224 -1234.

陈阳军(

), 陈敏(

)

厦门大学海洋与地球学院，福建厦门 361102

收稿日期:2021-05-06 修回日期:2021-09-26 出版日期:2021-12-10
通讯作者: 陈阳军,陈敏 E-mail:22320170154914@stu.xmu.edu.cn;mchen@xmu.edu.cn
基金资助:
自然资源部南大洋综合调查专项项目“南极重点海域对气候变化的响应和影响”(IRASCC 01-01-02C);国家自然科学基金创新群体项目“海洋氮循环与全球变化”(41721005)

Dual Isotopes of Nitrite as Indicators of Marine Nitrogen Cycle

Yangjun CHEN( ), Min CHEN( )

College of Ocean and Earth Sciences，Xiamen University，Xiamen 361102，China

Received:2021-05-06 Revised:2021-09-26 Online:2021-12-10 Published:2022-01-20
Contact: Yangjun CHEN,Min CHEN E-mail:22320170154914@stu.xmu.edu.cn;mchen@xmu.edu.cn
About author:CHEN Yangjun (1992-), male, Shaoxing City, Zhejiang Province, Ph. D student. Research areas include isotope marine chemistry study. E-mail: 22320170154914@stu.xmu.edu.cn
Supported by:
the Special Comprehensive Survey on the Southern Ocean from Ministry of Natural Resources of China "Impact and response of Antarctic Seas to climate change" (Grant No. IRASCC 01-01-02C, IRASCC 02-01-01);The Innovation Group Project from National Natural Science Foundation of China "Marine nitrogen cycle and global change"(41721005)

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氮是海洋生物生长必需的营养元素，其循环过程及其与碳、磷等生源要素的循环紧密耦合，共同调控着海洋生态系统的结构和功能。亚硝酸盐是海洋氮循环过程的关键中间体，在硝化、反硝化、厌氧氨氧化和硝酸盐生物吸收等氮转化过程中起着重要的作用。亚硝酸盐氮、氧同位素技术是新近发展起来的新技术，在甄别海洋亚硝酸盐的源汇过程，阐释氮组分的迁移转化，揭示缺氧区的氮循环等方面具有独到价值。近些年来，亚硝酸盐氮和氧同位素技术被应用于阿拉伯海、东热带北太平洋、东热带南太平洋、南海和东海等海域的研究，揭示了真光层和缺氧区亚硝酸盐的累积成因、海洋氧化亚氮的产生机制、缺氧区氮生物地球化学循环以及硝酸盐和亚硝酸盐之间的氮同位素交换动力学特征等，极大地深化了我们对海洋氮循环的认识。就未来发展趋势看，有关真光层和缺氧区亚硝酸盐的生物地球化学循环过程、硝酸盐和亚硝酸盐之间氮、氧同位素交换的动力学研究等仍需加强，以准确描绘海洋氮循环的路径并构建海洋氮收支状况。

关键词: 亚硝酸盐, 氮同位素, 氧同位素, 海洋氮循环

Nitrogen is an essential nutrient for the growth of all living organisms in the ocean. Its cycling processes and its close coupling with the cycle of biological elements such as carbon and phosphorus jointly regulate the structure and function of marine ecosystem. Nitrite serves as a key intermediate in oceanic nitrogen cycle， and plays an important role in various nitrogen transformation processes such as nitrification， denitrification， anammox， nitrate bioabsorption. Nitrogen and oxygen isotopes of nitrite are newly developed technologies， which have unique value in identifying the source and sink processes of oceanic nitrite， explaining the transport and transformation of various nitrogen components， as well as revealing the nitrogen cycling in the oxygen-deficient zones. In recent years， nitrogen and oxygen isotopes of nitrite have been widely applied in the oceanic regions such as the Arabian Sea， the eastern tropical North Pacific， the eastern tropical South Pacific， the South China Sea and the East China Sea. These studies revealed the reasons for the accumulation of nitrite in oceanic euphotic zone and oxygen-deficient zones， the production mechanism of nitrous oxide in the ocean， the biogeochemical cycle of nitrogen in the oxygen-deficient zones， as well as the isotope exchange dynamics of nitrogen in an isotopic exchange reaction between nitrate and nitrite， which greatly deepened our understanding of nitrogen cycle in marine environment. In terms of the future development trend of ocean nitrogen cycle research， it is still necessary to strengthen research in several fields， such as the biogeochemical processes of nitrite in the euphotic zone and the oxygen-deficient zones， the dynamics of the nitrogen and oxygen isotope exchange systems in the isotope exchange reaction between nitrate and nitrite. In this way， the path of the ocean nitrogen cycle can be described more accurately， and the nitrogen budget in marine environment can be established quantitatively.

Key words: Nitrite, Nitrogen isotope, Oxygen isotope, Marine nitrogen cycle

中图分类号:

P736.4

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