{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T10:27:11Z","timestamp":1773656831152,"version":"3.50.1"},"reference-count":63,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2021,9,4]],"date-time":"2021-09-04T00:00:00Z","timestamp":1630713600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Food security is essential for human survival and sustainable development. Due to rapid urbanization and industrialization, the farmland loss in Yangtze River Delta Urban Agglomeration (YRDUA) has threatened food security. Thus, this study intended to quantify the farmland loss and assess its impacts on food security in the YRDUA from 2000 to 2020 at three scales based on the Google Earth Engine platform. Our results show that the area of farmland in YRDUA is decreasing at a rather high speed in the past 20 years and the trend is getting worse. At the urban agglomeration scale, there was a farmland deficit of 0.44 million ha in 2000, followed by larger farmland deficits in 2010 and 2020. At the city scale, Shanghai had the largest scarcity of farmland. At the urban subgroup scale, Subgroup I in the west and Subgroup II in the north always maintained an oversupply of farmland, while Subgroup III in the east and Subgroup IV in the south faced serious food security problems. Our study suggests that farmland must be protected in YRDUA in order to ensure food self-sufficiency and promote regional sustainability.<\/jats:p>","DOI":"10.3390\/rs13173514","type":"journal-article","created":{"date-parts":[[2021,9,6]],"date-time":"2021-09-06T13:18:26Z","timestamp":1630934306000},"page":"3514","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["The Impacts of Farmland Loss on Regional Food Self-Sufficiency in Yangtze River Delta Urban Agglomeration over Last Two Decades"],"prefix":"10.3390","volume":"13","author":[{"given":"Xuelin","family":"Duan","sequence":"first","affiliation":[{"name":"School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China"}]},{"given":"Qingxiang","family":"Meng","sequence":"additional","affiliation":[{"name":"School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China"}]},{"given":"Xufeng","family":"Fei","sequence":"additional","affiliation":[{"name":"Zhejiang Academy of Agricultural Sciences, Hangzhou 310000, China"}]},{"given":"Meng","family":"Lin","sequence":"additional","affiliation":[{"name":"Qingdao Urban Planning and Design Research Institute, Qingdao 266000, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7594-2404","authenticated-orcid":false,"given":"Rui","family":"Xiao","sequence":"additional","affiliation":[{"name":"School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, China"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1016\/j.scitotenv.2019.02.118","article-title":"Quantifying the impacts of climate variability and human interventions on crop production and food security in the Yangtze River Basin, China, 1990\u20132015","volume":"665","author":"Xu","year":"2019","journal-title":"Sci. Total Environ."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1917","DOI":"10.1126\/science.1092958","article-title":"Global food security: Challenges and policies","volume":"302","author":"Rosegrant","year":"2003","journal-title":"Science"},{"key":"ref_3","first-page":"366","article-title":"The millennium development goals report 2013","volume":"365","year":"2013","journal-title":"United Nations Pubns"},{"key":"ref_4","unstructured":"Graziano da Silva, J. (2019). From Fome Zero to Zero Hunger: A Global Perspective, Food and Agriculture Organization of the United Nations."},{"key":"ref_5","first-page":"6","article-title":"The United Nations Sustainable Development Goals","volume":"1","author":"Ferranti","year":"2019","journal-title":"Encycl. Food Secur. Sustain."},{"key":"ref_6","unstructured":"FAO, IFAD, WFP, WHO, and UNICEF (2019). The State of Food Security and Nutrition in the World 2019: Safeguarding against Economic Slowdowns and Downturns, FAO."},{"key":"ref_7","first-page":"23727322211032250","article-title":"Food Insecurity: What Are Its Effects, Why, and What Can Policy Do About It?","volume":"1","author":"Hines","year":"2021","journal-title":"Policy Insights Behav. Brain Sci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"e000513","DOI":"10.3945\/cdn.117.000513","article-title":"Food Security and the 2015-2030 Sustainable Development Goals: From Human to Planetary Health: Perspectives and Opinions","volume":"1","year":"2017","journal-title":"Curr. Dev. Nutr."},{"key":"ref_9","unstructured":"Torero, M. (2020, August 31). Food Security Brings Economic Growth\u2014Not the Other Way Around. Available online: https:\/\/www.devex.com\/news\/food-security-brings-economic-growth-not-the-other-way-around-84561."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"2293","DOI":"10.1017\/S136898001500021X","article-title":"Food security and sustainability: Can one exist without the other?","volume":"18","author":"Berry","year":"2015","journal-title":"Public Health Nutr."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"386","DOI":"10.1016\/j.chieco.2003.09.018","article-title":"Rural\u2013urban migration and urbanization in China: Evidence from time-series and cross-section analyses","volume":"14","author":"Zhang","year":"2003","journal-title":"China Econ. Rev."},{"key":"ref_12","first-page":"39","article-title":"The new rural-urban labor mobility in China: Causes and implications","volume":"29","author":"Seeborg","year":"2000","journal-title":"J. Behav. Exp. Econ."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"595","DOI":"10.1111\/j.1813-6982.1997.tb01381.x","article-title":"Rural-urban migration or urbanization in South Africa","volume":"65","author":"Mears","year":"1997","journal-title":"S. Afr. J. Econ."},{"key":"ref_14","first-page":"447","article-title":"Increasing rural to urban migration in India: A challenge or an opportunity","volume":"2","author":"Singh","year":"2016","journal-title":"Int. J. Appl. Res."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"102701","DOI":"10.1016\/j.cities.2020.102701","article-title":"Urban\u2013rural construction land transition and its coupling relationship with population flow in China\u2019s urban agglomeration region","volume":"101","author":"Zhu","year":"2020","journal-title":"Cities"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"575","DOI":"10.1007\/s10980-018-0621-4","article-title":"Spatiotemporal patterns, relationships, and drivers of China\u2019s agricultural ecosystem services from 1980 to 2010: A multiscale analysis","volume":"33","author":"Yu","year":"2018","journal-title":"Landsc. Ecol."},{"key":"ref_17","unstructured":"UN (2020, August 20). World Population Prospects 2019. Available online: https:\/\/population.un.org\/wpp\/."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"474","DOI":"10.1016\/j.jclepro.2018.10.008","article-title":"Analysis for spatial-temporal changes of grain production and farmland resource: Evidence from Hubei Province, central China","volume":"207","author":"Chai","year":"2019","journal-title":"J. Clean. Prod."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"660","DOI":"10.1016\/j.scitotenv.2016.10.107","article-title":"Urban expansion brought stress to food security in China: Evidence from decreased cropland net primary productivity","volume":"576","author":"He","year":"2017","journal-title":"Sci. Total Environ."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1007\/s11442-014-1082-6","article-title":"Spatiotemporal characteristics, patterns, and causes of land-use changes in China since the late 1980s","volume":"24","author":"Liu","year":"2014","journal-title":"J. Geogr. Sci."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Yu, M., Guo, S., Guan, Y., Cai, D., Zhang, C., Fraedrich, K., Liao, Z., Zhang, X., and Tian, Z. (2021). Spatiotemporal Heterogeneity Analysis of Yangtze River Delta Urban Agglomeration: Evidence from Nighttime Light Data (2001\u20132019). Remote Sens., 13.","DOI":"10.3390\/rs13071235"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Rozzi, R., Palmer, C., Armesto, J., and Callicott, J. (2013). Hierarchy Theory: An Overview. Linking Ecology and Ethics for a Changing World. Ecology and Ethics, Springer.","DOI":"10.1007\/978-94-007-7470-4"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"43","DOI":"10.1016\/j.apgeog.2018.07.002","article-title":"What drives urban growth in China? A multi-scale comparative analysis","volume":"98","author":"Li","year":"2018","journal-title":"Appl. Geogr."},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Liu, Y., Yuan, Y., and Gao, S. (2019). Modeling the Vagueness of Areal Geographic Objects: A Categorization System. ISPRS Int. J. Geo-Inf., 8.","DOI":"10.3390\/ijgi8070306"},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Goodchild, M.F. (2001, January 19\u201323). A Geographer Looks at Spatial Information Theory. Proceedings of the Spatial Information Theory: Foundations of Geographic Information Science, International Conference, Cosit, Morro Bay, CA, USA.","DOI":"10.1007\/3-540-45424-1_1"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1080\/07038992.1999.10874736","article-title":"Hierarchy and scaling: Extrapolating information along a scaling ladder","volume":"25","author":"Wu","year":"1999","journal-title":"Can. J. Remote Sens."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"337","DOI":"10.1016\/j.isprsjprs.2019.11.021","article-title":"Annual large-scale urban land mapping based on Landsat time series in Google Earth Engine and OpenStreetMap data: A case study in the middle Yangtze River basin","volume":"159","author":"Liu","year":"2020","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1002\/widm.8","article-title":"Classification and regression trees","volume":"1","author":"Loh","year":"2011","journal-title":"Wiley Interdiscip. Rev. Data Min. Knowl. Discov."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"112045","DOI":"10.1016\/j.rse.2020.112045","article-title":"Accurate cloud detection in high-resolution remote sensing imagery by weakly supervised deep learning","volume":"250","author":"Li","year":"2020","journal-title":"Remote Sens. Environ."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"20","DOI":"10.1016\/j.isprsjprs.2021.02.009","article-title":"Learning deep semantic segmentation network under multiple weakly-supervised constraints for cross-domain remote sensing image semantic segmentation","volume":"175","author":"Li","year":"2021","journal-title":"ISPRS J. Photogramm. Remote Sens."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1756","DOI":"10.1109\/TCYB.2020.2989241","article-title":"Error-Tolerant Deep Learning for Remote Sensing Image Scene Classification","volume":"51","author":"Li","year":"2021","journal-title":"IEEE Trans. Cybern."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"100","DOI":"10.1080\/00031305.1978.10479265","article-title":"A Note on Sample Size Estimation for Multinomial Populations","volume":"32","author":"Tortora","year":"1978","journal-title":"Am. Stat."},{"key":"ref_33","first-page":"291","article-title":"A study on spatio-temporal changes in patterns of China\u2019s cultivated land use from 2009 to 2015","volume":"39","author":"Chen","year":"2019","journal-title":"Bull. Soil Water Conserv."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1016\/j.landurbplan.2017.02.014","article-title":"Urban agglomeration: An evolving concept of an emerging phenomenon","volume":"162","author":"Fang","year":"2017","journal-title":"Landsc. Urban. Plann."},{"key":"ref_35","first-page":"5","article-title":"Social Network Analysis of Urban Agricultural Economic Links in Beijing-Tianjin-Hebei Region","volume":"32","author":"Kong","year":"2018","journal-title":"J. Beijing Vocat. Coll. Agric."},{"key":"ref_36","first-page":"75","article-title":"Functional polycentricity in Yangtze River delta based on social network analysis","volume":"33","author":"Ye","year":"2016","journal-title":"J. Univ. Chin. Acad. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"012026","DOI":"10.1088\/1755-1315\/615\/1\/012026","article-title":"Network analysis of R&D technology spillovers effect in the Yangtze River Delta Region","volume":"615","author":"Jiang","year":"2020","journal-title":"IOP Conf. Ser. Earth Environ. Sci"},{"key":"ref_38","doi-asserted-by":"crossref","unstructured":"Wasserman, S., and Faust, K. (1994). Social network analysis: Methods and applications, Cambridge University.","DOI":"10.1017\/CBO9780511815478"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/j.resconrec.2018.12.023","article-title":"How does urbanization affect farmland protection? Evidence from China","volume":"145","author":"Huang","year":"2019","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1007\/s12061-016-9210-6","article-title":"Comparative Analysis of Urban Competitiveness in the Yangtze River Delta and Pearl River Delta Regions of China, 2000\u20132010","volume":"10","author":"Wang","year":"2017","journal-title":"Appl. Spat. Anal. Policy"},{"key":"ref_41","first-page":"1","article-title":"Has Administrative Zoning Adjustment Strengthened Land Property Operation? Policy Effects from Yangtze River Delta","volume":"41","author":"Huang","year":"2020","journal-title":"Trop. Geogr."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1040","DOI":"10.1016\/j.jclepro.2016.09.177","article-title":"A long-term analysis of urbanization process, landscape change, and carbon sources and sinks: A case study in China\u2019s Yangtze River Delta region","volume":"141","author":"Han","year":"2017","journal-title":"J. Clean. Prod."},{"key":"ref_43","doi-asserted-by":"crossref","unstructured":"Cheng, C., Yang, X., and Cai, H. (2021). Analysis of Spatial and Temporal Changes and Expansion Patterns in Mainland Chinese Urban Land between 1995 and 2015. Remote Sens., 13.","DOI":"10.3390\/rs13112090"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"646","DOI":"10.1016\/j.jenvman.2009.09.028","article-title":"Analysis of arable land loss and its impact on rural sustainability in Southern Jiangsu Province of China","volume":"91","author":"Liu","year":"2010","journal-title":"J. Environ. Manag."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"552","DOI":"10.1016\/j.landusepol.2015.06.014","article-title":"Farmland protection policies and rapid urbanization in China: A case study for Changzhou City","volume":"48","author":"Liang","year":"2015","journal-title":"Land Use Policy"},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Radwan, T.M., Blackburn, G.A., Whyatt, J.D., and Atkinson, P.M. (2019). Dramatic loss of agricultural land due to urban expansion threatens food security in the Nile Delta, Egypt. Remote Sens., 11.","DOI":"10.3390\/rs11030332"},{"key":"ref_47","unstructured":"Sorensen, A., Freedgood, J., Dempsey, J., and Theobald, D. (2018). Farms Under Threat: The State of America\u2019s Farmland, American Farmland Trust."},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Wang, Y.-S. (2019). The challenges and strategies of food security under rapid urbanization in China. Sustainability, 11.","DOI":"10.3390\/su11020542"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"104675","DOI":"10.1016\/j.landusepol.2020.104675","article-title":"The incremental construction land differentiated management framework: The perspective of land quota trading in China","volume":"96","author":"Cao","year":"2020","journal-title":"Land Use Policy"},{"key":"ref_50","unstructured":"Cao, B., and Xia, B. (2015). Report on Food Development in the Yangtze River Delta\u2014Food Security in the Yangtze River Delta, Economic Management Press."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1016\/j.agsy.2017.01.001","article-title":"Exploring nutrient management options to increase nitrogen and phosphorus use efficiencies in food production of China","volume":"163","author":"Wang","year":"2018","journal-title":"Agric. Syst."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"2802","DOI":"10.2135\/cropsci2016.04.0215","article-title":"Yield Responses to Planting Density for US Modern Corn Hybrids: A Synthesis-Analysis","volume":"56","author":"Assefa","year":"2016","journal-title":"Crop. Sci."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.scitotenv.2015.05.050","article-title":"An evaluation of the water utilization and grain production of irrigated and rain-fed croplands in China","volume":"529","author":"Cao","year":"2015","journal-title":"Sci. Total Environ."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1099","DOI":"10.1002\/ps.3598","article-title":"The increasing importance of herbicides in worldwide crop production","volume":"69","author":"Gianessi","year":"2013","journal-title":"Pest Manag. Sci."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1016\/j.foodpol.2010.10.003","article-title":"Rethinking the global food crisis: The role of trade shocks","volume":"36","author":"Headey","year":"2011","journal-title":"Food Policy"},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"440","DOI":"10.1016\/j.jenvman.2017.12.047","article-title":"Changing man-land interrelations in China\u2019s farming area under urbanization and its implications for food security","volume":"209","author":"Long","year":"2018","journal-title":"J. Environ. Manag."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"65","DOI":"10.1016\/j.landusepol.2015.07.010","article-title":"Local farmland loss and preservation in China\u2014A perspective of quota territorialization","volume":"49","author":"Chien","year":"2015","journal-title":"Land Use Policy"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"158","DOI":"10.1016\/j.apgeog.2013.11.009","article-title":"The effects of China\u2019s cultivated land balance program on potential land productivity at a national scale","volume":"46","author":"Song","year":"2014","journal-title":"Appl. Geogr."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Mao, Y., Zhao, N., and Yang, X. (2013). Food Security and Farm Land Protection in China, World Scientific. [1st ed.].","DOI":"10.1142\/8513"},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"682","DOI":"10.1016\/j.landusepol.2016.06.036","article-title":"Co-ordination of land exploitation, exploitable farmland reserves and national planning in China","volume":"57","author":"Jin","year":"2016","journal-title":"Land Use Policy"},{"key":"ref_61","doi-asserted-by":"crossref","unstructured":"Yang, Q., Yang, R., Wang, Y., and Shi, K. (2019). Does Fallowing Cultivated Land Threaten Food Security? Empirical Evidence from Chinese Pilot Provinces. Sustainability, 11.","DOI":"10.3390\/su11102836"},{"key":"ref_62","unstructured":"Farooq, M., Nawaz, A., and Nadeem, F. (2019). Crop Rotations, Fallowing, and Associated Environmental Benefits. Oxford Research Encyclopedia of Environmental Science, Oxford University Press."},{"key":"ref_63","doi-asserted-by":"crossref","unstructured":"Zhou, B.-B., and Lv, L. (2020). Understanding the dynamics of farmland loss in a rapidly urbanizing region: A problem-driven, diagnostic approach to landscape sustainability. Landsc. Ecol.","DOI":"10.1007\/s10980-020-01074-w"}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/17\/3514\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:56:25Z","timestamp":1760165785000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/17\/3514"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,9,4]]},"references-count":63,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2021,9]]}},"alternative-id":["rs13173514"],"URL":"https:\/\/doi.org\/10.3390\/rs13173514","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,9,4]]}}}