Bibliometric Analysis of Soil Fertility Evaluation Papers Based on Core Journals in CNKI

[Objectives]This study was conducted to deeply analyze the research status in the field of soil fertility evaluation.[Methods]With the core journals of Peking University included in CNKI database from 2002 to 2021 as the research object,papers were searched in the advanced search mode using SU=‘soil fertility’and SU=‘evaluation’as the retrieval subject terms and analyzed by the bibliometric research method,from three perspectives,namely,the annual number of papers published,the number of papers issued by authors and the number of highly cited papers.[Results]A total of 891 first authors issued 990 papers related to soil fertility evaluation in total from 2002 to 2021,with an average annual number of papers published at about 50,and the number of published papers showed a trend of rapidly increasing first and then gradually stabilizing.The top 13 authors published 3-4 papers,including Yang Xiaojuan,Chen Haisheng and Li Xinju(4 papers)ranking first.The top 10 papers with the highest citation frequency were published in 9 journals,respectively covering ecology,forestry,agriculture,geography,engineering and other fields,which shows that there are many kinds of journals focusing on the research field of soil fertility evaluation.[Conclusions]The results can provide reference for further research on soil fertility evaluation.

Characteristics of the Bibliometric Indexes of Chinese Core Journals on Environmental and Occupational Medicine

This paper investigated the current characteristics and changing trends of major journals on Chinese environmental and occupational medicine in order to promote the development of these journals. This study focused on the seven core journals in the area of environmental and occupational medicine listed on the Chinese Scientifi c and Technical Journal Citation Reports (2008 version). These journals were China Occupational Medicine, Chinese Journal of Industrial Hygiene and Occupational Diseases, Chinese Journal of Industrial Medicine, Industrial Health and Occupational Diseases, Journal of Environment and Health, Journal of Environmental and Occupational Medicine, Occupation and Health. Various observations were based on data from www.cnki.net and Chinese Scientif ic and Technical Journal Citation Reports (2008 version), including cover of the journal, issue period, exposure to the internet, level of open source, impact factor, cited half-life, web immediacy index and rate of downloads per year. The outcomes showed that in appearance, the overall characteristics were continuous improvement of the covers, issue period, and moving toward the internet. In terms of contents, all factors had been improving. Nevertheless the level of influence was not very stable. The use of internet and the level of resource openness still have a long way to go to meet the international standard. There is still a huge gap for improvement. The contents and the appearance both need to be improved to serve the ever developing environmental and occupational medicine career.

Research Progress of Different Fertilization Models in Farmland Based on Bibliometrics

In order to grasp the research status of different fertilization modes in China s farmland more comprehensively, with papers in core journals of Chinese Peking University collected in CNKI database from 2003 to 2022 as the main research object, this paper analyzed the research status of different fertilization modes from the perspectives of annual number of published papers, published journals, keywords and highly cited papers applying the bibliometrics research method. This study provides reference for the research in this field.

Visualized Analysis of Research Progress on Soil Aggregates

[Objectives]This study was conducted to gain an in-depth understanding of the research status of fields related to soil aggregates.[Methods]The academic papers published from 2001 to 2020 in the field of soil aggregates were searched in the CNKI database serving as the statistical source using the subject terms"soil"and"aggregate"under advanced search,and visually analyzed by bibliometric statistical methods,from the perspectives of the annual number of published papers,the number of papers published by authors,and highly cited papers.[Results]The trend of the number of published papers in the past 20 years was mainly divided into three stages:2001-2007,2008-2016,and 2017-2020.There were 192 first authors in the literature related to soil aggregates.The authors with the top 3 published papers were Wang Erli,Zhang Zhengxiong,Li Yangbing,and Yang Yonghui(tied for third).Three highly cited papers were published in journals related to"ecology",and the top 10 most cited papers focused on the"formation and stability"of soil aggregates and the relationship between aggregates and soil organic matter and biochar.[Conclusions]This study can provide reference for further research on soil aggregates.