Journal of Ecology and Rural Environment ›› 2022, Vol. 38 ›› Issue (6): 702-713.doi: 10.19741/j.issn.1673-4831.2021.0427

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Analysis of Hotspots and Progress of Researches for Nitrogen Flows Based on CiteSpace

ZHU Wang-yue1, WANG Yan-hua1,2,3, ZHAO Zi-han1   

  1. 1. School of Geography, Nanjing Normal University, Nanjing 210023, China;
    2. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;
    3. Key Laboratory of Virtual Geographic Environment of Ministry of Education, Nanjing Normal University, Nanjing 210023, China
  • Received:2021-07-07 Online:2022-06-25 Published:2022-06-24

Abstract: To analyze the current research status and hotspots of nitrogen flow at home and abroad from January 2000 to April 2021, the keywords of "nitrogen balance", or "nitrogen flow", or "nitrogen cascade", or "nitrogen cycle" were searched on the Web of Science and CNKI, respectively, and a total of 6 998 publications were found. Using CiteSpace to visualize the cooperative network and keywords, the results show that: (1) The researches on reactive nitrogen flow abroad were mainly focused on denitrification, agriculture, nitrogen cycle, nitrogen pollution, nitrogen balance, and ecological analysis; whereas the domestic researches were mainly focused on nitrogen cycle, nitrogen balance, crop growth performance, crop yield, nitrogen metabolism, nitrogen deposition, microbial influence on nitrogen transformation, carbon and nitrogen cycle. (2) From 2000 to 2021, the nitrogen cycle can be divided into four stages, which showed an obvious succession trend of macro-micro-macro & micro coupling. (3) The United States and China are the top two countries with most publications. Combined with centrality analysis, it was found that the number of articles published was not completely correlated with the academic influence. (4) The meta-analysis of literature indicate that more attention should be paid to the role of model in quantitative assessment of reactive nitrogen in the future, which could provide an important basis for optimizing nitrogen management and improving ecological and environmental health.

Key words: nitrogen flow, bibliometrics, CiteSpace, visualized analysis, research hotspots

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