Research hotspots and trends of groundwater and ecology studies: Based on a bibliometric approach
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Abstract: Groundwater, as a critical component of the hydrological cycle, is essential for sustainable ecosystem development. To clarify the current status of domestic and overseas research, and to identify hotspots, frontier and future trends of groundwater and ecology research, this study utilizes bibliometric methods and CiteSpace software to examine relevant published articles in the Web of Science (WOS) and CNKI databases from 1978 to 2022. Specifically, this study analyzes (1) the annual number of published papers; (2) research institutions; (3) keywords; and (4) evolution of research hotspots. The findings reveal that the United States, China, and Germany are the top three countries in groundwater and ecology research. International research hotspots mainly focus on microbial ecology, climate change, groundwater-surface water interactions in the hyporheic zone, biodiversity, and submarine groundwater discharge, while domestic research hotspots mainly focus on ecological water conveyance, ecological flow, groundwater development and utilization, groundwater pollution, and groundwater and ecological protection. Both domestic and international research hotspots exhibit interdisciplinary features with diverse research objects and assessment methods. Future research in this area is expected to focus on topics such as contamination, groundwater quality, framework, mechanism, spatial distribution, and dissolved organic matter. Additionally, the study of ecological recharge, ecological flow, ecological protection, water intake and use will continue to be the hot topics domestically.
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Table 1. Yearly numbers of published papers on groundwater and ecology exported from WOS and CNKI database
Year Number of papers (WOS) Number of papers (CNKI) Year Number of papers(WOS) Number of papers(CNKI) Year Number of papers(WOS) Number of papers (CNKI) 2022 321 446 2007 176 1037 1992 37 24 2021 1007 1454 2006 183 937 1991 25 31 2020 854 1346 2005 156 807 1990 5 24 2019 767 1249 2004 117 642 1989 9 11 2018 693 1215 2003 141 484 1988 1 6 2017 629 1234 2002 102 292 1987 1 15 2016 560 1255 2001 100 230 1986 1 9 2015 557 1011 2000 99 156 1985 - 13 2014 462 1055 1999 90 52 1984 1 14 2013 377 1104 1998 110 39 1983 1 6 2012 337 989 1997 75 51 1982 - 5 2011 370 977 1996 60 42 1981 - 5 2010 276 1035 1995 94 32 1980 1 - 2009 262 949 1994 56 21 1979 - 2 2008 220 1014 1993 48 25 1978 1 2 Table 2. Top 10 countries in number of published articles in WOS and CNKI database
NO Country Number of articles Percentage 1 USA 3135 33.4% 2 China 1496 15.9% 3 Germany 947 10.1% 4 Australia 914 9.7% 5 Canada 632 6.7% 6 England 526 5.6% 7 France 475 5.1% 8 Netherlands 457 4.9% 9 Spain 421 4.5% 10 Italy 380 4.1% Table 3. Top ten institutions in number of published articles in WOS and CNKI databases
WOS CNKI Institutions Number of articles Institutions Number of articles Chinese Academy of Sciences 574 China University of Geosciences(Beijing) 581 League of European Research Universities Leru 469 Jilin University 549 United States Department of the Interior 363 Chang’an University 536 United States Geological Survey 341 Northwest A&F university 406 University of California System 311 Hohai University 353 Helmholtz Association 294 Lanzhou University 347 Centre National De La RechercheScientifiquecnrs 281 Xi’an University of Technology 343 United States Department of Agriculture USDA 254 Beijing Forestry University 334 State University system of Florida 235 Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences 321 United States Department of Energy Doe 199 Xinjiang University 303 Table 4. High frequency keywords for groundwater and ecology in WOS and CNKI database(2002–2022)
CNKI WOS NO Cited frequency Year Keywords NO Cited frequency Year Keywords 1 1 005 2002 Groundwater 1 501 2002 Groundwater 2 330 2002 Water resources 2 363 2002 Water 3 286 2002 Ecological environment 3 358 2002 Ecology 4 112 2006 Numerical modelling 4 269 2002 Diversity 5 87 2003 Groundwater level 5 258 2002 Climate change 6 87 2017 Comprehensive treatment 6 194 2003 Dynamics 7 79 2003 Development and utilization 7 191 2002 River 8 79 2011 Ecological remediation 8 183 2002 Soil 9 71 2003 Ecologic water conveyance 9 177 2002 Pattern 10 68 2003 Countermeasure 10 171 2002 Management 11 64 2018 Ecological water compensation 11 170 2002 Biodiversity 12 57 2002 Ecological water requirement 12 162 2006 Impact 13 55 2002 Water environment 13 159 2002 Vegetation 14 50 2003 Tarim River 14 140 2002 Community 15 45 2003 Surface water 15 133 2003 Surface water 16 44 2009 Protection 16 133 2002 Ecosystem 17 44 2003 Evaluation index system 17 124 2004 Flow 18 43 2002 Soil 18 119 2002 Aquifer 19 42 2004 Influence 19 114 2002 Steam 20 41 2005 Evaluation 20 108 2002 Growth 21 39 2005 Reuse water 21 107 2002 Model 22 37 2016 Over-mining area 22 106 2002 Water quality 23 36 2005 Optimal configuration 23 101 2002 Sediment 24 34 2017 Sponge City 24 100 2002 Nitrogen 25 33 2005 Arid region 25 98 2002 Microbial community 26 33 2016 Water quality 26 86 2010 Stable isotope 27 33 2007 Ecosystem 27 85 2007 Land use 28 32 2012 Pollution 28 81 2002 Temperature 29 32 2020 Ecological flow 29 79 2002 Bacteria 30 31 2008 Measure 30 78 2002 System 31 31 2008 Vegetation 31 77 2009 Quality 32 30 2017 Hydrogeology 32 77 2003 Carbon 33 29 2002 Human activities 33 76 2007 Drinking water 34 29 2016 Water chemistry 34 74 2002 Hyporheic zone 35 28 2003 South-North water transfer project 35 71 2005 Forest 36 28 2013 Water ecology 36 70 2004 Transport 37 27 2002 Ecology 37 70 2007 Habitat 38 27 2012 Populus diversifolia 38 69 2003 Variability 39 26 2016 Environmental implication 39 68 2003 Nitrate 40 25 2007 Protection measures 40 68 2008 Heavy metal 41 25 2012 Coal mining with water conservation 41 67 2006 Basin 42 25 2009 Analysis 42 67 2002 Degradation 43 25 2014 Influence factors 43 67 2002 Spnov 44 25 2002 Climate change 44 64 2003 Organic matter 45 25 2011 Wetland 45 63 2009 Evolution 46 25 2004 Forecast 46 63 2002 Plant 47 25 2020 Yellow River 47 63 2002 Wetland 48 25 2016 Water sources 48 62 2008 Conservation 49 24 2016 Hebei province 49 59 2007 Microbial ecology 50 23 2015 Environmental protection 50 57 2009 Ecosystem service -
Beganskas S, Gorski G, Weathers T, et al. 2018. A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge. Water Research, 144: 274−284. DOI: 10.1016/j.watres.2018.07.039. Bertrand G, Goldscheider N, Gobat JM, et al. 2012. Review: From multi-scale conceptualization to a classification system for inland groundwater-dependent ecosystems. Hydrogeology Journal, 20: 5–25. Boulton AJ, Fenwick GD, Hancock PJ, et al. 2008. Biodiversity, functional roles and ecosystem services of groundwater invertebrates. Invertebrate Systematics, 22: 103–116. https://doi.org/10.1071/IS07024 Bussi G, Whitehead PG, Gutiérrez-Cánovas C, et al. 2018. Modelling the effects of climate and land-use change on the hydrochemistry and ecology of the River Wye (Wales). Science of the Total Environment, 627: 733−743. DOI: 10.1016/j.scitotenv.2018.01.295. Cao YQ, Lu J. 2021. Research status and frontier analysis of meteorological drought at domestic and abroad. China Flood & Drought Management, 31(3): 1−7. (in Chinese) DOI: 10.16867/j.issn.1673-9264.2020353. Chen X, Huang RC, Huang F, et al. 2022. A comprehensive study of the maintaining mechanisms for hydrological cycle and ecological evolution and function in the northwest inland river basins of China. Hydrogeology & Engineering Geology, 49(5): 12−21. (in Chinese) DOI: 10.16030/j.cnki.issn.1000-3665.202203018. Chen Y, Chen CM, Liu ZY, et al. 2015. The methodology function of CiteSpace mapping knowledge domains. Studies in Science of Science, 33(2): 242−253. (in Chinese) Conant B, Robinson CE, Hinton MJ, et al. 2019. A framework for conceptualizing groundwater-surface water interactions and identifying potential impacts on water quality, water quantity, and ecosystems. Journal of Hydrology, 574: 609−627. DOI: 10.1016/j.jhydrol.2019.04.050. Crosbie RS, Pickett T, Mpelasoka FS, et al. 2013. An assessment of the climate change impacts on groundwater recharge at a continental scale using a probabilistic approach with an ensemble of GCMs. Climate Change, 117(1): 41−53. DOI: 10.1007/s10584-012-0558-6. Cui X, Zhang B, He MX, et al. 2021. Impacts of ecological water replenishment on the hydrochemical characteristics of surface water and groundwater in Lake Baiyangdian Watershed. Journal of Lake Sciences, 33(6): 1675−1686. (in Chinese) DOI: 10.18307/2021.0606. Dams J. 2012. Spatio-temporal impact of climate change on the groundwater system. Hydrology and Earth System Sciences, 16(5): 1517−1531. DOI: 10.5194/hess-16-1517-2012. Danielopol DL, Pospisil P, Rouch R. 2000. Biodiversity in groundwater: A large scale view. Trends in Ecology & Evolution, 15: 223−224. DOI: 10.1016/S0169-5347(00)01868-1. Dong HB, Liu SB, Damdinsuren B, et al. 2022. Research on domestic ecological compensation based on CiteSpace. Acta Ecologica Sinica, 42(20): 8521−8529. (in Chinese) DOI: 10.5846/stxb202109082529. Epting J, Vinnå LR, Piccolroaz S, et al. 2022. Impacts of climate change on Swiss alluvial aquifers – A quantitative forecast focused on natural and artificial groundwater recharge by surface water infiltration. Journal of Hydrology, X 17: 100140. Fei YH, Liu YC, Li YS, et al. 2022. Prospect of groundwater pollution remediation methods and technologies in China. Geology in China, 49(2): 420−434. (in Chinese) DOI: 10.12029/gc20220206. Fillinger L, Hug K, Griebler C. 2021. Aquifer recharge viewed through the lens of microbial community ecology: Initial disturbance response, and impacts of species sorting versus mass effects on microbial community assembly in groundwater during riverbank filtration. Water Research, 189: 116631. DOI: 10.1016/j.watres.2020.116631. Flynn TM, Sanford RA, Bethke CM. 2008. Attached and suspended microbial communities in a pristine confined aquifer. Water Resources Research, 44: W07425. DOI: 10.1029/2007WR006633. Glanville K, Ryan T, Tomlinson, et al. 2016. A method for catchment scale mapping of groundwater-dependent ecosystems to support natural resource management (Queensland, Australia). Environmental Management, 57: 432–449. Griebler C, Lueders T. 2009. Microbial diversity in groundwater ecosystems. Freshwater Bilogy, 54: 649−677. DOI: 10.1111/j.1365-2427.2008.02013.x. Griebler C, Stein H, Kellermann C, et al. 2010. Ecological assessment of groundwater ecosystems–Vision or illusion? Ecological Engineering, 36: 1174-1190. Griebler C, Fillinger L, Karwautz C, et al. 2022. Knowledge gaps, obstacles, and research frontiers in groundwater microbial ecology. Encyclopedia of Inland Waters (Second Edition), 3: 611−624. DOI: 10.1016/B978-0-12-819166-8.00200-0. Guo YL, Zhang C, Wu Q, et al. 2020. Analysis of focused topics in karst hydrogeology research based on bibliometrics. Carsologica Sinica, 39(6): 817−828. (in Chinese) DOI: 10.11932/karst2020y13. Han SB, Li FC, Wang S, et al. 2021. Groundwater resource and eco-environmental problem of the Yellow River Basin. Geology in China, 48(4): 1001−1019. (in Chinese) DOI: 10.12029/gc20210402. Hayashi M, Rosenberry DD. 2002. Effects of ground water exchange on the hydrology and ecology of surface water. Ground water, 40: 309−316. DOI: 10.1111/j.1745-6584.2002.tb02659.x. He MH, Yang XL. 2022. Research hotspots and trends of ecological environmental protection in the Yellow River Basin: A visualization analysis based on CiteSpace. Journal of Henan Polytechnic University: Social Sciences, 23(4): 57−64. (in Chinese) DOI: 10.16698/j.hpu(social.scienccs).1673-9779.2022.04.009. He XY, Chen Y. 2015. Microbes and their purification effect in groundwater. Studies of Trace Elements and Health, 32(5): 56−59. (in Chinese) Huan H, Wang JS, Zhai YZ, et al. 2011. Chemical characteristics and evolution of groundwater in the Yongding River alluvial fan of Beijing Plain. Acta Geoscientica Sinica, 32(3): 357−366. (in Chinese) DOI: 10.3975/cagsb.2011.03.11. Huang MJ, Wang XH, Zhao F, et al. 2021. Research progress of zero-valent-iron microbial coupled system in remediating contaminated groundwater. China Environmental Science, 41(3): 1119−1131. (in Chinese) DOI: 10.3969/j.issn.1000-6923.2021.03.014. Kalbus E, Reinstorf F, Schirmer M. 2006. Measuring methods for groundwater, surface water and their interactions: A review. Hydrology and Earth System Sciences, 3(4): 1809−1850. DOI: 10.5194/HESSD-3-1809-2006. Korbel, KL, Hose GC. 2011. A tiered framework for assessing groundwater ecosystem health. Hydrobiologia, 661: 329−349. DOI: 10.1007/s10750-010-0541-z. Li J, Liang YP, Zhou SZ, et al. 2021. Research progress on application of microorganism in groundwater pollution remediation. Environmental Pollution & Control, 43(5): 638−643. (in Chinese) DOI: 10.15985/j.cnki.1001-3865.2021.05.020. Li YY, Li M, Sang PD. 2022. A bibliometric review of studies on construction and demolition waste management by using CiteSpace. Energy & Buildings, 258: 111822. DOI: 10.1016/j.enbuild.2021.111822. Ling MH, Chen X, Cheng QB, et al. 2011. Couple Modeling between surface hydrology process and groundwater dynamic process and its application. Journal of China Hydrology, 6: 8−13. (in Chinese) DOI: 10.3969/j.issn.1000-0852.2011.06.002. Liu YY, Feng YQ, Jiang X. 2022. Literature analysis of surface water and groundwater interaction based on CiteSpace. South-to-North Water Transfers and Water Science & Technology, 20(2): 218−229. (in Chinese) DOI: 10.13476/j.cnki.nsbdqk.2022.0024. Long XH, Guo ZX, Liao ZL, et al. 2012. Brief review of groundwater ecology. Journal of Anhui Agriculture Science, 40(26): 13071−13076. (in Chinese) Luo L. 2008. Research on groundwater pollution and its prevention-control policy in China. Journal of China University of Geosciences (Social Sciences Edition), 8(2): 72−75. (in Chinese) DOI: 10.3969/j.issn.1671-0169.2008.02.014. Ma R, Dong QM, Sun ZY, et al. 2013. Using heat to trace and model the surface water -groundwater Interactions: A Review. Geological Science and Technology Information, 32(3): 131−137. (in Chinese) Ma JZ, Li JJ, Gao QZ. 2002. Groundwater evolution and its influence on eco-environment under climatic change and human activity in the south of Tarim Basin. Arid Land Geography, 35(1): 16−23. (in Chinese) DOI: 10.3321/j.issn:1000-6060.2002.01.004. Maamar SB, Aquilina L, Quaiser A, et al. 2015. Groundwater isolation governs chemistry and microbial community structure along hydrologic flowpaths. Frontiers in Microbilogy, 6: 1457. DOI: 10.3389/fmicb.2015.01457. Majola K, Xu YX, Kanyerere T. 2022. Review: Assessment of climate change impacts on groundwater-dependent ecosystems in transboundary aquifer settings with reference to the Tuli-Karoo transboundary aquifer. Ecohydrology & Hydrobiology, 22: 126−140. DOI: 10.1016/j.ecohyd.2021.08.013. Sophpcleous M. 2002. Interactions between groundwater and surface water: The state of the science. Hydrogeology Journal, 10(1): 52−67. DOI: 10.1007/s10040-001-0170-8. Teng YG, Su J, Zhai YZ, et al. 2012. A review on the overlay and index method for groundwater pollution risk assessment. Advances in Earth Science, 27(10): 1140−1147. (in Chinese) Voisin J, Cournoyer B, Marjolet L, et al. 2020. Ecological assessment of groundwater ecosystems disturbed by recharge systems using organic matter quality, biofilm characteristics, and bacterial diversity. Environmental Science and Pollution Research, 27: 3295−3308. DOI: 10.1007/s11356-019-06971-5. Wang HQ, Li ZH, Zhang MS, et al. 2019. Eco-environmental impact caused by water resources exploration and land space optimization in Shiyang River Basin. Northwestern Geology, 52(2): 207−217. (in Chinese) DOI: 10.19751/j.cnki.61-1149/p.2019.02.022. Wang HY, Zhang W, Zhang YZ, et al. 2022. A bibliometric review on stability and reinforcement of special soil subgrade based on CiteSpace. Journal of Traffic and Transportation Engineering (English Edition), 9(2): 223−243. DOI: 10.1016/j.jtte.2021.07.005. Wang JG, Liang LY, He MS, et al. 2022. Knowledge graph of researches on utilization efficiency of water resources in China based on CiteSpace. Journal of Economics of Water Resources, 40(2): 24−30. (in Chinese) DOI: 10.3880/j.issn.1003-9511.2022.02.004. Wang WK, Li JT, Wang Z, et al. 2007. Evolution of the relationship between river and groundwater and several scientific problems. Journal of Jilin University (Earth Science Edition), (2): 231−238. (in Chinese) Wang WK, Yang ZY, Cheng DH, et al. 2011. Method of ecology-oriented groundwater resource assessment in arid and semiarid area. Journal of Jilin University (Earth Science Edition), 41(1): 159−167. (in Chinese) DOI: 10.3969/j.issn.1671-5888.2011.01.019. Wang WK, Gong CC, Zhang ZY, et al. 2018. Research status and prospect of the subsurface hydrology and ecological effect in arid regions. Advances in Earth Science, 33(7): 702−718. (in Chinese) Wei FL, Li SC, Yu WS, et al. 2019. History and present situation of research on stable isotopes of precipitation: Based on bibliometrics and network analysis. Acta Ecologica sinica, 39(7): 2634−2643. (in Chinese) DOI: 10.5846/stxb201803130490. Wu Q, Kong QY, Zhang ZZ, et al. 2005. Coupled modeling of surface water-groundwater system I: Model. Journal of Hydraulic Engineering, (5): 588−592, 597. (in Chinese) Xi BD, Li J, Wang Y, et al. 2019. Strengthening the innovation capability of groundwater science and technology to support the coordinated development of Beijing-Tianjin-Hebei region: Status Quo. Problems and Goals, 32(1): 1−9. (in Chinese) DOI: 10.13198./jissn.1001-6929.2018.09.27. Xie H, Li J, Lang SZ, et al. 2021. Research status of groundwater pollution based on bibliometrics. South-to-North Water Transfers and Water Science Technology, 19(1): 168−178. (in Chinese) DOI: 10.13476/j.cnki.nsbdqk.2021.0017. Xiong HX, Wang YZ, Guo X, et al. 2022. Current status and future challenges of groundwater vulnerability assessment: A bibliometric analysis. Journal of Hydrology, 615: 128694. DOI: 10.1016/j.jhydrol.2022.128694. Xu B, Zhang Y. 2018. Assessment of groundwater ecosystem security in arid oasis Shihezi reclamation area in Xinjiang. Research of Environmental Sciences, 31(5): 919−926. (in Chinese) DOI: 10.13198/j.issn.1001-6929.2017.04.13. Xu QY, Lin J, Yang Q, et al. 2016. Study advances on eco-environmental effect of groundwater and its Control-indexes. Urban Geology: 16−21. (in Chinese) DOI: 10.3969/j.issn.1007-1903.2016.03.003. Xue YQ, Zhang YK. 2009. Twofold significant of ground water pollution prevention in China’s water pollution control. Acta Scientiae Circumstantiae, 29(3): 474−481. (in Chinese) DOI: 10.3321/j.issn:0253-2468.2009.03.002. Yang H, Wang YX, Xie XJ, et al. 2011. Reduction of arsenic in groundwater from Hetao Plain with the involvement of indigenous microbes. Earth Science-Journal of China University of Geosciences, 36(3): 594−598. (in Chinese) DOI: 10.3799/dqkx.2011.061. Yang J, Cheng CX. 2017. The comparison of “Big Data” literatures analysis tools: Taking Citespace and SCI2 as Examples. Computer Science and Application, 7(6): 580−589. (in Chinese) DOI: 10.12677/csa.2017.76069. Yin LH, Zhang J, Wang Z, et al. 2021. Groundwater circulation patterns and its resources assessment of inland river catchments in northwestern China. Geology in China, 48(4): 1094−1111. (in Chinese) DOI: 10.12029/gc20210408. Zhang J, Yong H. 2018. Ecological regulation and monitoring warning of groundwater in the arid area Tarim River Basin. Journal of China Agricultural Resources and Regional Planning, 39(5): 77−83. (in Chinese) DOI: 10.7621/cjarrp.1005-9121. Zhang S, Zhang Y, Zhang FE, et al. 2004. Remediation of nitrate-contaminated groundwater in Situ using a micro-ecological techniques. Journal of Agro-Environment Science, 23(6): 1223−1227. (in Chinese) DOI: 10.3321/j.issn:1672-2043.2004.06.044. Zhang YL, Zhang YZ, Zhang Y, et al. 2014. Characteristics of nitrate in surface water and groundwater in the Hun River Basin. China Environmental Science, 34(1): 170−177. (in Chinese) DOI: 10.3969/j.issn.1000-6923.2014.01.035. Zhang YX, Gan YQ, Zhou XY, et al. 2022. Mobilization of fluoride in sediments at high fluoride area enhanced by microorganisms. Bulletion of Geological Science and Technology, 41(3): 228−235. (in Chinese) DOI: 10.19509/j.cnki.dzkq.2022.0078. Zhang YT, Xiao HB, Nie XD, et al. 2020. Evolution of research on soil erosion at home and abroad in the past 30 years-based on bibliometric analysis. Acta Pedologica Sinica, 57(4): 797−810. (in Chinese) DOI: 10.11766/trxb201906030237. Zhou CS, Zou SZ, Zhu DN, et al. 2021. Research progress of main technologies for remediation of soil and groundwater pollution. China Mining Magazine, 30(Suppl 2): 221−227. (in Chinese) DOI: 10.12075/j.issn.1004-4051.2021.S2.006. Zhu JF, Liu YY, Zhang SA, et al. 2017. Review on the research of surface water and groundwater interactions. China Environmental Science, 37(8): 3002−3010. (in Chinese) Zhu HY, Chen YJ, Liu JZ, et al. 2014. Study on the circulation of groundwater influenced by water delivery engineering at the middle and lower tarim river. Journal of Guizhou Normal University (Natural Sciences), 32: 6−12, 20. (in Chinese) DOI: 10.3969/j.issn.1004-5570.2014.06.002. Zhuang ZC, Li C, Gu SH, et al. 2022. Research progress and hot-spot analysis of the supply-demand relationship of ecosystem services based on CiteSpace. Ecological Science, 41(4): 212−222. (in Chinese) DOI: 10.14108/j.cnki.1008-8873.2022.04.025.