Portnov B A, Erell E, Bivand R, Nilsen A
Int J Popul Geogr. 2000 Mar-Apr;6(2):133-54. doi: 10.1002/(SICI)1099-1220(200003/04)6:2<133::AID-IJPG173>3.0.CO;2-A.
In a previous study (Portnov and Erell, 1998a), an Index of Clustering was defined, which allowed an analysis of the combined effect of spatial isolation and remoteness of peripheral towns on the long-term patterns of their population growth. In the present paper, the analysis of the effect of clustering of the urban field on the patterns of population growth is extended to centrally located urban places, and the validity of this index is tested in two unevenly populated countries--Israel and Norway. In both countries, the effect of clustering of the urban field on the patterns of urban growth is twofold. In sparsely populated areas, the presence of neighboring towns appears to increase their chances of attracting potential migrants due to inter-urban exchanges, while in more densely populated areas, increasing clustering tends to reduce migration influx to a given locality due to inter-town competition. Following this conclusion, a strategy of "redirecting priorities" leading to the formation of urban clusters is proposed, which may enhance the potential of urban growth in geographical areas where this is desirable.
在之前的一项研究中（波特诺夫和埃雷尔，1998a），定义了一个集聚指数，该指数能够分析周边城镇的空间隔离和偏远程度对其人口长期增长模式的综合影响。在本文中，对城市区域集聚对人口增长模式的影响分析扩展到了位于中心位置的城市地区，并在两个人口分布不均的国家——以色列和挪威对该指数的有效性进行了检验。在这两个国家，城市区域集聚对城市增长模式的影响是双重的。在人口稀少的地区，相邻城镇的存在似乎会因城市间的交流而增加吸引潜在移民的机会，而在人口较为密集的地区，集聚程度的增加往往会因城镇间的竞争而减少流入特定地区的移民数量。基于这一结论，提出了一种“重新调整优先事项”的策略，以形成城市集群，这可能会增强在希望实现城市增长的地理区域的城市增长潜力。
