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| DOI：10.13522/j.cnki.ggps.2019182 |
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| Review of Subsurface Drains in Farmland Using Knowledge Graph |
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DING Xinjun, TIAN Juncang, ZHU He
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1.College of Civil and Hydraulic Engineering Yinchuan, Ningxia University, Yinchuan 750021, China; 2.Engineering and Technology Esearch Center of Water-saving and Water Resource Regulation in Ningxia,
Yinchuan 750021, China; 3.Engineering Research Center of the Ministry of Education for Modern Agricultural Water Resources High Efficiency in Arid Area, Yinchuan 750021, China
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| Abstract: |
| 【Objective】To explore the content and emerging trends of subsurface drainage research at home and aboard【Method】Analyzing literature citation data of subsurface drainage research download from WOS and CNKI database, by adopting scientific text mining visualization software VOS-viewer, and through science overlay map analysis, institute bibliographic coupling analysis, keywords co-occurrence analysis and author co-authorship network analysis.【Result】Through the scientific overlay map, the development direction of the subsurface drainage research discipline is analyzed from the macroscopic point of view; through the country cooperation analysis, the research power were: USA, Canada, Germany, China, Netherlands, France, Sweden, England, Denmark, Switzerland; through the institute bibliographic coupling analysis, the high-impact research institution of the subsurface drainage research were USDA ARS, Iowa State University, University of Illinois, University of Minnesota, Purdue University, Agriculture and Agri-Food Canada, U.S. Geological Survey, Swedish University of Agricultural Sciences, Ohio State University; through the comparison of the domestic and international keyword co-occurrence network map, the domestic The gap between the main contents of the subsurface drainage research; through the analysis of the cooperation network map domestic and international, pointed out the cooperation between the scholars at home and abroad, and their contribution to the study of the subsurface drainage research discipline【Conclusion】The research indicates that the research field of subsurface drainage in China is in the state of introduction and absorption. The research of subsurface drainage in the basin scale, the mechanism of pesticide and phosphorus leaching in the field scale, and the purification of drainage water are weak. The emerging trend in the future is to establish a systematic research system from the source of the subsurface drainage landscape to the end of the drainage, considering the diversified factors of drainage management, and engineering to improve the drainage water quality by establishing a denitrifying nitrogen removal biological reaction tank at the source of the field drainage. The agronomic measures on the non-cultivation period cover crop planting research, and the coupling of climate change and subsurface drainage research will also become a research hotspot. |
| Key words: subsurface drainage; VOSviwer; knowledge map; water saving irrigation; water and salt migration; research progress |
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