Review and prospect of land consolidation and rehabilitation engineering in China--Based on the bibliometric analysis of the literature published amount in the "Land Consolidation and Rehabilitation Engineering" column of Transactions of the CSAE from 2002 to 2020

Abstract: The land consolidation project is one of the most important approaches to ensure national food and ecological security. An academic journal "Transactions of the Chinese Society of Agricultural Engineering" launched a column of "Land Consolidation Project" in 2002, in order to promote the research of land consolidation project. This column was renamed the "Land Resource Guarantee and National Land Ecological Security" from the 9th issue of May 2020, with the continuous expansion of research fields in the modern land consolidation project. In this study, the bibliometrics was utilized to statistically analyze the papers published in the "Land Consolidation Project" column of "Transactions of the Chinese Society of Agricultural Engineering" from 2002 to 2020. Great research progress was highlighted in the different research directions, and then the future focus was proposed in the field of land resource and national ecological security, with emphasis on China's strategy of food and ecological security. The results showed that the research directions of land consolidation project mainly included land use, land evaluation, agricultural land consolidation, cultivated land quality and safety, 3S and land information technology, industrial and mining wasteland reclamation, rural residential area consolidation, land ecology, land restoration, basic farmland construction and protection, land saving, rural spatial pattern and development, cultivated land development, as well as urban land consolidation. Furthermore, land evaluation, agricultural land consolidation, and cultivated land quality and safety had become hot topics, where the publications accounted for 10.52%, 10.16%, and 8.51%, respectively. 5-keyword clustering was formed, such as the land evaluation, agricultural land consolidation, cultivated land quality and safety, 3S and land information technology, as well as industrial and mining wasteland reclamation. Additionally, 10 groups of cooperation networks were formed in the leading research fields using the cooperation network of research authors generated by VOSviewer. More importantly, the published papers in the "Land Consolidation Project Column" had covered all directions of the land consolidation project. Ecological land consolidation and land-use security pattern were established in recent years, where the ecological effect of land consolidation was analyzed using the theory of landscape ecology. Moreover, many efforts have been made on the ecological design and restoration technology of single land consolidation project, together with the pattern evolution and layout optimization of rural residential areas. In the future, much more attention can be paid to the land resource security and national land ecological security, particularly to the theories and mechanisms in the "systematization, ecologicalization, informationization and intelligence" for the protection and restoration of the regional ecosystem, to realize "overall protection, unified restoration and comprehensive management" of "mountain-water-forest-field-lake-grass". Consequently, the ecological security pattern of national land can be built, once the research on the intelligent management of one map of natural resources was implemented using the state-of-the-art big data in intelligent agriculture.