基于Cite Space的生物质炭对土壤氮循环影响的文献计量分析

为了明确生物质炭对土壤氮循环影响领域的研究热点和发展趋势，本文基于中国知网（CNKI）和Web of Science数据库，检索了1998—2019年该领域的文献，利用文献计量学软件Cite Space对年发文量、发文国家、机构、作者群体、共被引和关键词聚类进行了可视化分析，并总结了未来可能的研究趋势．结果显示:近年来中文和外文文献发表数量均呈现增长趋势，但外文文献增长速率更快；中国和美国是发文量最多的2个国家，但TOP20高引用率文献中美国占比较高；中文文献发表数量靠前的机构分别为河南农业大学、山西省农业科学院、中国农业科学院，外文文献排名TOP10的科研机构中中国占7个；作者群体分析显示科研团队之间的学术交流相对较少；基于关键词聚类和突现词分析，生物质炭对土壤品质改善和土壤氮转化过程（矿化、硝化和反硝化等）的影响机制，以及氮循环中的相关微生物对生物质炭添加的响应，是该领域未来的研究重点． 

Biochar modulation of the soil nitrogen cycle: a Cite Space-based bibliometric study

To identify proactive areas in biochar modulation of the soil nitrogen cycle, Cite Space was applied to Web of Science and CNKI, to analyze total number of publications, countries of origin, author home institution, highly-cited authors and keywords, from 1998-2019．The total number of articles in both Chinese and foreign languages gradually increased, those in foreign languages increased at a higher rate．Most published papers were found to be from China and the United States, but the latter showed a high proportion in top 20 (TOP20) highly cited papers．Top institutions with most published articles written in Chinese include Henan Agricultural University, Shanxi Academy of Agricultural Sciences, and Chinese Academy of Agricultural Sciences．Of the 10 top institutions with the most numerous articles published in international journals, seven were located in China．However, author group analysis revealed limited academic exchange among different research groups．Analysis of keyword clustering and burst terms identified research areas that will need to be addressed more extensively in the future: soil quality improvement by biochar, biochar modulation of soil nitrogen cycling (mineralization, nitrification and denitrification), and nitrogen cycle-related microbe modulation of biochar addition．