Food supply networks in the Pearl River Delta mega-city region:Characteristics,resilience and security strategies
Affected by major emergencies such as extreme weather,public health,and the Russo-Ukrainian war,maintaining the stability of the food supply network system has become an essential issue in ensuring food security in urban areas.This study uses public transaction data of food enterprises to construct a coupled geospatial food supply network,exploring the food supply network structure and transaction distance characteristics in the Pearl River Delta mega-city region using a network analysis approach.On this basis,the"dynamic"resilience of regional food supply networks from a risk propagation perspective is assessed,and critical nodes affecting network stability are identified.The results show that the PRD has formed a polycentric food supply organizational structure and urban self-loop structure with Guangzhou-Foshan and Shenzhen as the core,and the polycentric structure has a high ability to avoid external risks;the regional food supply is characterized by spatial proximity and source diversity,and the total number of transactions generally conforms to the distance decay law;the attacks significantly reduce the resilience of the food supply network compared with random failures,and the top 15 nodes in the degree centrality ranking are the critical nodes that trigger the cascade effect and lead to severe degradation of network performance.Based on the above results,policy recommendations to ensure the stability of regional food supply are proposed in terms of deepening domestic and international production network cooperation,strengthening food supply infrastructure construction,and optimizing territorial spatial planning patterns.
万方数据
维普
