Research On The Structural Characteristics And Influence Factor Of World Oilseeds Crops Trade Network

Oil crops are highly dependent on natural resources and are difficult to replace.They are the most valuable component of agricultural resources and have a wide range of uses due to their high oil content.In addition to being used to extract oil for human consumption,it also plays an important role in industry,medicine and national defense,and is related to the safety of people’s lives and national food security.Along with the continuous growth of the world’s population,the continuous development of animal husbandry,oil extraction and processing industry,the demand for oil crops in the international market is also increasing day by day.Adequate supply of oil crops is crucial to a country’s economic and livelihood development.At present,China is the largest consumer of oil crops and the largest importer.China’s oilseed crop imports are rising,resulting in the domestic oilseed industry facing high external dependence and high dependency,which urgently needs to adjust the oilseed trade strategy to diversify the import risk.The direction and flow of oilseed crop trade in the world affects the international market,and thus constitutes an intricate trade network.Therefore,based on the world oilseed trade network,it is particularly important to analyze the structural characteristics and influencing factors of the oilseed trade network and reveal the evolution of China’s position in the network structure.This paper firstly analyzes the development status and comparative advantages of oilseed crop trade quantitatively from three aspects: trade scale,trade structure and competitive advantages,and reveals the basic characteristics of the international oilseed trade pattern.Secondly,based on the complex network analysis method,using the oilseed trade relations and trade volume data among countries,we construct the world oilseed trade unweighted directed and weighted directed networks,and analyze the structural characteristics and evolution laws of the world oilseed trade network from three aspects: wholeness,centrality and core-edge structure.It is found that the world oilseeds trade network is well connected with obvious small-world attributes.However,the density and reciprocity coefficient of the overall network are relatively small,and the connection among node countries needs to be enhanced;compared with the highly concentrated oilseeds export market,the oilseeds import market is relatively fragmented,and the center of gravity of international trade gradually shifts to developing economies led by Brazil;the oilseeds trade network shows the characteristics of core-semi-edge-edge circle structure,and the countries in the core region are mostly concentrated in North and South America.The U.S.,Argentina and Brazil are the main core members and occupy the dominant position in the oilseeds trade network.The countries in the peripheral region are less involved in the oilseed trade and have sparse connections with other countries,so they are often in a relatively passive situation in the oilseed trade.Through the analysis of the structural characteristics of the world oilseed trade network,this paper further uses the quadratic assignment procedure model to investigate the factors affecting the structural changes of the oilseed trade network.In the paper,the unweighted network matrix and the weighted network matrix are used to characterize the oilseed trade relations and trade intensity,respectively.Ten indicators from economic scale,political system,geographical location,factor endowment,and social culture are selected as explanatory variables,thus constructing QAP correlation analysis and regression analysis models to empirically examine the direction and degree of influence of different variables on oilseed crop trade.The results show that four variables,namely per capita income difference,economic scale difference,land bordering and per capita arable land area difference,have significant positive effects on oilseed crop trade;while labor force quantity difference and institutional distance have significant negative effects;geographical distance variables have opposite directions of effects on oilseed trade relationship and trade intensity,showing negative correlation in the unweighted network matrix but positive in the weighted network The geographical distance variable has a negative correlation in the unweighted network matrix and a positive correlation in the weighted network.To ensure the security of supply of oilseed crops and national food security in China,this paper combines the findings of the previous study and proposes countermeasures in three aspects:optimizing the oilseed trade layout and improving network centrality;stabilizing the global oilseed supply chain and improving network interoperability;improving the self-sufficiency rate of oilseed crops and enhancing network participation,aiming to reduce China’s oilseed import risk and ensure oilseed supply security,so as to promote the oilseed industry The aim is to reduce the risk of China’s oilseed imports,ensure the security of oilseed supply and thus promote the sustainable and healthy development of the oilseed industry.