中国城市网络空间结构研究——基于A股上市医药公司网络

基于特定行业的企业联系数据研究城市网络具有独特的价值,对理解产业格局和城市功能都有重要意义。本文利用中国A股上市医药企业总部和子公司区位信息,研究中国医药行业的城市网络空间结构及其特征。研究发现：①中国医药企业总部主要集中在沿海三大经济区,即京津冀、长三角和珠三角地区;②中国医药企业的城市网络大致呈现以京津冀、长三角、珠三角、成渝地区及武汉为中心的菱形结构;城市网络之间的联系强度差异显著,主要通过等级扩散和邻近扩散形成,表现在发达城市之间及距离相近者联系较强;③发达城市在网络中普遍具有较高的权力和影响力,部分药材资源丰富的中小城市也在网络中发挥重要作用;④中国医药行业仍处于国际化的初期阶段,在该行业拥有较强国际联系的城市有杭州、深圳、昆明、天津等;⑤医药产业不同行业城市网络空间格局差异较大,北京、上海、武汉等大城市在各个网络中都发挥重要节点的连通作用。

Spatial structure of urban network based on Chinese A-share listed medicine enterprise network

Urban network research based on a specific type of industry has unique value and is essential for understanding the industrial pattern and urban function. Using the data of headquarters and branches of the Chinese A-share listed medicine enterprises, this article analyzes the characteristics of urban networks shaped by these firms. The results show that: (1) Most of the headquarters of medicine enterprises are concentrated in the coastal economic regions, including the Yangtze River Delta, the Pearl River Delta, and the Beijing-Tianjin-Hebei Region. Wuhan, Beijing, and Hangzhou are the important nodes in the network. (2) Five urban clusters stand out in the urban networks shaped by Chinese medicine enterprises. Moreover, the connectivity values in urban networks are significantly different, which are mainly formed by hierarchical diffusion and proximity diffusion, with strong connections between the developed city pairs and their surrounding cities. (3) Developed cities generally have high power and influence in the network. Meanwhile, some small or medium-sized cities with abundant resources have also played an important role in the network. (4) China's medicine industry is still in the early stages of internationalization. Only a few cities, such as Hangzhou, Shenzhen, Kunming, and Tianjin, have strong international connections. (5) The spatial structures of urban networks vary greatly among different subsectors of medicine enterprises, while Beijing, Shanghai, Wuhan, and other major cities play a central role in all subnetworks.