基于文献计量的生物炭对土壤氮素影响研究进展与热点分析OA

In order to systematically understand research advances of effects of biochar on soil nitrogen,taking 426 relevent articles collected from China National Knowledge Infrastructure(CNKI)database and 2 391 relev-ent articles collected from Web of Science(WOS)core collection database from 2015 to 2024 as research ob-jects,CiteSpace 6.4.R1 and VOSviewer softwares were used to conduct visual analysis from perspectives of pub-lication trends,major research forces as well as cooccurrence,clustering and burst detection of key words.Re-sults showed that annual number of publications in two databases steadily increased,while number of publica-tions and growth rate in WOS database were higher than those in CNKI database.Number of publications of China was 1 369,far exceeding that of other countries.Research clusters centered around institutes such as Chi-nese Academy of Sciences and Northwest A&F University have formed.Authors with abundant publications in WOS database included Chang,Scott X,Riaz,Muhammad and Wang,Hailong,while Ren Tianbao,Liu Guos-hun,He Lili and Cai Kunzheng were prolific authors in CNKI database.Overall domestic and international col-laboration networks remained relatively loose,and stable and long term core teams of leading authors with prom-inent influences have not yet established.High-frequency key words mainly included"nitrogen""carbon""soil nutrients"and"yield".Latest research hotspots focused on directions related to greenhouse gas emission reduc-tion,such as"N ₂ O emissions"and"volatilization".Research hotspots have evolved through distinct phases,shifting from initial studies on biochar preparation and physicochemical properties towards studies on regula-tion of soil microorganisms and enzyme activities.Recently,aligned with"dual carbon"goals,research has con-centrated on nitrogen reduction and sustainable agricultural applications,forming a complete research frame-work encompassing"preparation regulation-soil improvement-nitrogen cycling-crop response-technical sup-port".Future research in this field should prioritize strengthening collaborative efforts among research groups and ensuring research continuity.Further exploration was required to reveal mechanisms of biochar in soil im-provement and remediation,vegetation growth promotion and greenhouse gas emission regulation.