世界原木贸易的微观贸易模式及社区结构分析

Research on Micro Trade Patterns and Community Structure of World Log Trade

文中运用块模型和模体发现算法对世界原木网络中的微观贸易模式和社区结构进行了分析。研究结果表明：世界木材微观贸易模式以半闭合结构为主，分别为同一节点具有2个发出或接受关系以及1个节点同时存在接受和发出关系；通过子图组合机制检验了贸易网络中局部结构是否存在高集聚性和“中间人”效应，发现世界原木局部网络结构集聚性低，但存在“中间人”效应；根据块模型的位置信息，可将世界原木网络划分为主溢出板块、主受益板块、经纪人板块和孤立板块。

Based on the UN trade data,this study adopted the block model and the motif finding algorithm to analyze the micro trade patterns and community structure of world log network. The results showed that ： the micro trade patterns of world logs presents a semi-closed structure of, respectively, the relationship of one same node with two emission or acceptance, and the relationship of one node with the coexistence of emission or acceptance ; through the subgraph combination mechanism, the study verified if the local structure of micro trade patterns presents the existence of high concentration and the ＂inter-mediator＂ effect. It was found that the local network structure of world log has a low concentration level, but presents the existence of ＂inter- mediator＂ effect; in addition, the local network structure can be divided into the main benefit plate, the main overflow plate, the agent plate and the isolation plate according to the position information.