Human activities have significantly changed the global nitrogen cycle and its underlying processes. Many scholars have studied flows of reactive nitrogen at a range of spatial and temporal scales. However, due to the complexity of the research subject, the diversified research content and methods, and the wide range of research scales, there has been no systematic synthesis of the research in this field. To provide that synthesis, we performed a literature search in the Web of Science core collection, then used the CiteSpace bibliometric visualization software to summarize the evolution of this field of research from 1962 to March 2020 and visualize both the evolution of and the relationships within these data. We found that the number of publications in the field of reactive nitrogen flows in macroscopic systems exploded after 1990. The co-occurrence author cooperation network (1194 scholars) showed a distribution with many groups, and Cornell University's research team (R.W. Howarth, D.P. Swaney, and E.W. Boyer) has been among the biggest contributors to the field due to the team's large number of publications. Cluster analysis showed that "urban metabolism", "denitrification", "atmospheric deposition", and "nitrogen budget" are not only research hotspots, but also important knowledge bases. In addition, based on our analysis, we predict that the impact of urbanization on the flows of reactive nitrogen, a single process with clearer flow links and more detailed accounting parameters, and relevant studies serving the goal of efficient and low-pollution management of reactive nitrogen will become hotspots. Our results provide a historical reference and suggest new frontiers for future research in the field of reactive nitrogen flows.

人类活动已大大改变了全球氮循环及其基本过程。许多学者已经研究了时空范围内反应性氮的流动。但是，由于研究主题的复杂性，研究内容和方法的多样性以及研究规模的广泛性，该领域的研究尚未得到系统的综合。为了提供综合信息，我们在Web of Science核心收藏集中进行了文献搜索，然后使用CiteSpace文献计量可视化软件总结了该研究领域从1962年到2020年3月的发展，并可视化了这些领域的发展和关系。数据。我们发现，在宏观系统中，反应性氮流领域的出版物数量在1990年之后呈爆炸式增长。共现作者合作网络（1194名学者）显示了与许多团体的分布，康奈尔大学的研究团队（RW Howarth，DP Swaney和EW Boyer）由于该领域的大量研究而成为该领域的最大贡献者。出版物。聚类分析表明，“城市代谢”，“反硝化”，“大气沉积”和“氮平衡”不仅是研究热点，而且是重要的知识库。此外，根据我们的分析，我们预测城市化对活性氮流量的影响，具有更清晰的流量链接和更详细的会计参数的单一过程以及相关研究将有效地对活性氮进行低污染管理氮将成为热点。