| After China’s accession to the WTO in 2001,China’s economy has become more market-oriented,and its trade and industrial economy has achieved unprecedented development.The deepening degree of trade liberalization has made China more and more closely engaged in international trade.The free and open trade environment has increased the external development opportunities of agricultural market,while also facing a huge impact.The stability of food production is the basis for the stability of a country’s livelihood and prosperity.At present,our country’s food security is the transition from the original number of food safety to the structural safety,main show is periodic,structural exceeds the demand and supply of our country into a "inventory,import,production," three amount so,much starker choices-and graver consequences-in during the ministry of agriculture planting structure adjustment for the new deployment,In pursuit of the development goals of "two guarantees,three stability and two coordination",corn,wheat and rice are the key development objects of grain and grain in two guarantees,and the adjustment of planting structure presents significant heterogeneity among crops.Exploring the causes of this phenomenon and improving the accuracy of grain supply capacity are the primary problems to be solved.International trade,food crops by free trade,trade,trade environment and trade policies,crop prices production conditions,agricultural technology development,trade liberalization under the pace of urbanization in our country,the agricultural labor force to reduce employment,and mechanization as the substitution of labor as the important material basis for the development of agriculture,therefore,To study the influence mechanism of trade liberalization on grain planting structure and analyze the degree of mechanization of three crops as the intermediary factor is a more concrete study on the current production environment of grain crops.This paper firstly reviews the research status through literature review and presents the possible mechanism analysis between research variables.Then,based on the provincial panel data from 2000 to 2019,Taking tariff level to measure trade liberalization level as the explanatory variable,mechanization degree of three crops as the intermediary variable,and change of grain planting structure as the explained variable,the mediation effect model and double fixed effect model regression were carried out to clarify the possibility of influencing mechanism of the change of planting structure of three crops through theoretical and empirical analysis.At the same time,relevant suggestions are given to solve the problem of "three quantities rising together" and imbalance between supply and demand in the development of food security.The results showed that :(1)there was heterogeneity among crops in the adjustment of planting structure among corn,wheat and rice,among which the planting structure of corn showed an upward trend,while that of wheat and rice showed a downward trend to varying degrees,and that of wheat was more obvious than that of rice.(2)The increase and decrease of mechanization degree of various crops played a partial intermediary role in the impact of trade liberalization on grain planting adjustment,and the increase of trade liberalization and mechanization played a synergistic role in promoting maize planting,while the decrease of mechanization degree played a inhibitory role in wheat and rice planting.(3)The impact of trade liberalization on grain planting structure showed regional heterogeneity,especially in the central and western regions,while the correlation among the three effects was low in the eastern regions. |
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