In high-income countries, migration redistributed populations from congested city centres into the sparsely populated outskirts, raising challenges to environmental and population health and the conservation of biodiversity. We evaluate whether this periurbanisation process came to a halt in Switzerland by expecting a decline in internal migration and a renewed residential attractiveness of urban agglomeration centres (i.e., re-urbanisation)—two recent trend changes observed in Europe. Relying on data from censuses, registers and surveys, we describe trends in the intensity, geography and sociodemographic differentials of migration across consistently defined urban agglomeration density zones between 1966 and 2018. Although the overall intensity of migration declined, the rate increased among the working age population in part because of the societal diffusion of tertiary education. The dominant urban-bound migration flows are increasingly confined within agglomerations over time. After the diffusion of periurbanisation down the city hierarchy between 1966 and 1990, we observe the emergence of re-urbanisation in some agglomerations and sociodemographic groups around 2000. However, this phenomenon has been temporarily inflated by period-specific transformations in Swiss society. More recently, the process of periurbanisation intensified again and expanded more and more beyond official agglomeration borders.

中文翻译：

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城市扩张的终结？1966-2018 年瑞士城乡连续体的内部移民

在高收入国家，移民将人口从拥挤的城市中心重新分配到人口稀少的郊区，对环境和人口健康以及生物多样性保护提出了挑战。我们通过预期内部移民减少和城市群中心的新住宅吸引力（即再城市化）——最近在欧洲观察到的两个趋势变化——来评估这种周边城市化进程是否在瑞士停止。依靠来自人口普查、登记和调查的数据，我们描述了 1966 年至 2018 年间一致定义的城市群密度区的迁移强度、地理和社会人口差异的趋势。尽管迁移的总体强度有所下降，劳动年龄人口的比例增加部分是因为高等教育在社会上的传播。随着时间的推移，占主导地位的城市移民流动越来越局限在集聚区内。在 1966 年至 1990 年间城市周边化沿城市层级向下扩散之后，我们观察到 2000 年左右在一些城市群和社会人口群体中出现了再城市化。然而，这种现象因瑞士社会特定时期的转型而暂时膨胀。最近，城市周边化进程再次加强，并越来越多地扩展到官方集聚边界之外。在 1966 年至 1990 年间城市周边化沿城市层级向下扩散之后，我们观察到 2000 年左右在一些城市群和社会人口群体中出现了再城市化。然而，这种现象因瑞士社会特定时期的转型而暂时膨胀。最近，城市周边化进程再次加强，并越来越多地扩展到官方集聚边界之外。在 1966 年至 1990 年间城市周边化沿城市层级向下扩散之后，我们观察到 2000 年左右在一些城市群和社会人口群体中出现了再城市化。然而，这种现象因瑞士社会特定时期的转型而暂时膨胀。最近，城市周边化进程再次加强，并越来越多地扩展到官方集聚边界之外。