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Expansion of cropland area and formation of the eastern farming-pastoral ecotone in northern China during the twentieth century

Agricultural ImpactDesertificationBiogeographyLand UseAgricultural ProductionGeographyAgricultural EconomicsFarming SystemCropland AreaFarming SystemsLand DegradationNorthern ChinaTwentieth CenturyAgriculturePublic HealthSocial SciencesAgricultural HistoryCrop Intensification