21世纪以来城市蔓延国际研究进展与趋势

基于Web of Science数据库和CiteSpace可视化软件，对21世纪以来城市蔓延国际研究进展与趋势进行知识图谱分析。结果显示：①城市蔓延研究发文量总体呈上升趋势，主要发表在城市类或地理类期刊上；②城市蔓延研究的国家合作较为密切，但机构和作者合作网络较为分散，最活跃的国家、机构和作者分别是美国、中国科学院和萨尔瓦蒂（Salvati）；③以城市、增长、土地利用、城市化、美国、格局、中国、影响、区域、GIS等高频关键词为主线，大致形成了三个不同的研究阶段；④早期研究主要聚焦于城市蔓延单个领域，近期则开始与其他领域（如景观生态、人类健康、土地财政等）相结合。未来研究趋势主要体现在研究领域和合作网络的拓展、研究方法的创新和多尺度研究的增多等方面。

International research progress and trend of urban sprawl since the 21st century——An analysis of knowledge mapping based on CiteSpace

In order to deepen the understanding of the research progress of urban sprawl, this study analyzed international research progress and trends of urban sprawl since the 21^st century by using knowledge mapping, based on the "Web of Science" data and CiteSpace software. The results show that: (1) The number of published literatures on urban sprawl is generally on the rise, and the papers are mainly published in urban or geography journals. (2) There is a close cooperation among countries in the urban sprawl research, but the cooperation among institutions and the cooperation among authors are both insufficient. The most active country, institution and author engaged in urban sprawl research are the United States, the Chinese Academy of Sciences and Salvati respectively. (3) Based on the high-frequency keywords such as city, growth, land use, urbanization, the United States, patter, China, impact, region, GIS, etc., three different research stages (initial exploration period, high-speed development period and continuous development period) have been formed. (4) In the early days, the related research mainly focused on the single field of urban sprawl. However, it has gradually turned to the interdisciplinary research which is combining urban sprawl with other fields recently, such as landscape ecology, human health, land finance, etc. Compared with the existing urban sprawl review, the innovation of this study is that we use a new method which combines quantitative analysis of knowledge mapping and qualitative analysis. In the future, the research trends of urban sprawl will be mainly reflected in the expansion of research fields and cooperation networks, innovations in research methods, and increased multi-scale research.