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论文题目	Comparative assessment of nitrogen fixation rate by N-15(2) tracer assays in the South China Sea
论文题目（英文）	Comparative assessment of nitrogen fixation rate by N-15(2) tracer assays in the South China Sea
作者	Li, Danyang(1,2);Zheng, Minfang(1);Qiu, Yusheng(1);Lai, Limin(3,4);Chen, Nengwang(3,4);Jing, Hongmei(5);Zhang, Run(1);Chen, Min(1)
发表年度	2023-01
卷	42
期	1
页码
期刊名称	ACTA OCEANOLOGICA SINICA
摘要
摘要_英文	Nitrogen fixation is one of the most important sources of new nitrogen in the ocean and thus profoundly affects the nitrogen and carbon biogeochemical processes. The distribution, controlling factors, and flux of N-2 fixation in the global ocean remain uncertain, partly because of the lack of methodological uniformity. The N-15(2) tracer assay (the original bubble method -> the N-15(2)-enriched seawater method -> the modified bubble method) is the mainstream method for field measurements of N-2 fixation rates (NFRs), among which the original bubble method is the most frequently used. However, accumulating evidence has suggested an underestimation of NFRs when using this method. To improve the availability of previous data, we compared NFRs measured by three N-15(2) tracer assays in the South China Sea. Our results indicate that the relationship between NFRs measured by the original bubble method and the N-15(2)-enriched seawater method varies obviously with area and season, which may be influenced by incubation time, diazotrophic composition, and environmental factors. In comparison, the relationship between NFRs measured by the original bubble method and the modified bubble method is more stable, indicating that the N-2 fixation rates based on the original bubble methods may be underestimated by approximately 50%. Based on this result, we revised the flux of N-2 fixation in the South China Sea to 40 mmol/(m(2)center dot a). Our results improve the availability and comparability of literature NFR data in the South China Sea. The comparison of the N-15(2) tracer assay for NFRs measurements on a larger scale is urgently necessary over the global ocean for a more robust understanding of the role of N-2 fixation in the marine nitrogen cycle.