Eutrophication is the most common water environment problem of receiving water body. As a new literature analysis method in recent years, visual analysis of literature can be used to obtain some profound and intuitive understanding of the research content and development trend of eutrophication models. In this paper, literatures of eutrophication models in the past decade are analyzed from several different angles by CiteSpace, a visual analysis software. Results show that the international research on eutrophication models is gradually increasing. Research hotspots in this field mainly focus on lake eutrophication, Lake Erie, marine hypoxia, Baltic Sea, life cycle assessment, ecological degradation, Black Sea and so on. Research fronts in this field mainly focus on cyanobacteria and eutrophic lakes. According to the selected time interval, it can be divided into three time periods. The preliminary research focuses on eutrophication at the estuary and offshore; the medium-term research focuses on cyanobacteria lakes, and the later research focuses on river eutrophication. China hold the largest number of eutrophication research, which are mainly originated from the Chinese Academy of Sciences. In addition, China has close cooperative relations with many countries in the field of eutrophication models study which cross with many other research fields.
In order to clarify the context of the research progress of ecological restoration in mines, the Citespace bibliometric software was used to analyze the literature data related to this field in the CNKI database in the past 20 years. At the same time, it reveals the development direction and trend in the field of ecological restoration of mines through visual analysis of the amount of articles issued, the organization of the article, the author of the article, and the keywords. The results show that the period from 2001 to 2014 belongs to the low-speed development stage of this field, and the period from 2015 to 2020 belongs to the high-speed development stage; the cooperation relationship between relevant scientific research personnel and institutions is not close enough, and large-scale research has not been formed. The exchanges and cooperation between scientific research institutions and scientific researchers need to be further strengthened; mine ecology, geological environment management, open-pit abandoned mines, mine parks, etc. belong to the hotspots in the field of mine ecological restoration research; whether from the knowledge field or the technical level, the research in this field and policy measures are constantly improving.
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