基于交通流的关中城市群城际交互对城市空间增长的影响

流动空间背景下，探讨城际交互对城市群城市空间联动增长的影响对有效调控城市空间增长，促进城镇化可持续发展具有重要意义。本文以西部关中城市群为例，基于土地利用和城际交通出行大数据，系统分析了以城际出行表征的城际交互对关中城市群城市空间联动增长的影响。结果表明：(1)关中城市群城际交通出行空间组织呈现出以西安为核心，咸阳、渭南、宝鸡为次级节点的组织格局。(2)2010年以来，关中城市群城市空间规模迅速增加，八年间共增长1398.80 km²，年均增长174.85 km²，空间上主要集中于西安、咸阳和运城等地；西安是城市群城市空间增长的首要贡献者，在2010—2015年、2015—2018年间占比分别高达36.04%和34.70%。(3)与沿海发达地区类似，以城际交通出行表征的城际交互同样对西部关中城市群的城市空间增长呈现出逐步增强的正向驱动作用，第二阶段(2015—2018)解释贡献率显著高于第一时段(2010—2015)，分别为7.54%和5.50%。

IMPACT OF INTERCITY INTERACTION ON URBAN SPACE GROWTH IN THE GUANZHONG PLAIN URBAN AGGLOMERATION BASED ON TRAFFIC FLOWS

Previous studies on urban space growth mainly focused on the local driving forces. Against the background of the space of flows, it's significant to explore the impact of intercity interaction on urban space growth for promoting the sustainable development of urbanization. Using land use data and traffic big data inferred from passenger travels, this paper takes the Guanzhong Plain urban agglomeration as a case study to examine the impact of intercity interaction on urban space growth from 2010 to 2018. The potential driving factors of urban space growth has been divided into local and intercity interaction variables as previous studies. The results show that the spatial organization of intercity travel in Guanzhong urban agglomeration presents an organizational pattern with Xi'an as the core and Xianyang, Weinan, and Baoji as secondary nodes. Secondly, the Guanzhong urban agglomeration experienced a rapid and significant expansion of urban space during 2010—2018, with an increase of 1398.8 km², or an annual rate of 174.85 km², mainly concentrated in Xi'an, Xianyang and Yuncheng. Thirdly, similar to the developed coastal urban agglomerations, the intercity interaction, characterized by intercity passenger travel, has a gradually increasing positive driving effect on the urban space growth during the study period. Relative contribution rates are 5.50% and 7.54% in the period of 2010—2015 and 2015—2018, respectively. This study provides quantitative insights into the issue of sustainable urban space growth in western China.