Study On Spatiotemporal Variation And Its Driving Factors Of The Cultivated Land "Non-Grain" In Ji’an City

China is a major agricultural country,and food security is particularly important for China.Food security is an important guarantee for world peace and development.China has always adhered to the principle of "consolidating the foundation of food security in all aspects" and "ensuring that the rice bowl of the Chinese people is firmly held in its own hands".However,due to the large population and limited land in China,the low per capita arable land area,and the uneven distribution of arable land area,coupled with the impact of economic downturn and international conflicts,food security remains the primary task of governing the country and the state.It is necessary to respond to the uncertainty of the external environment by stabilizing production and ensuring supply.Cultivated land is the lifeblood of food production,and protecting cultivated land is to ensure China’s food security.In order to solve the food problem,the Chinese government has issued the "Opinions on Preventing the" Non Grain Conversion "of Cultivated Land and Stabilizing Food Production," reflecting the country’s determination to strictly control "Non Grain Conversion" and providing legal protection for the rectification work of "Non Grain Conversion".Located in the southeast of China,Ji’an City of Jiangxi Province is one of the important commodity grain and oil bases in China,and has the reputation of “granary in central Jiangxi”.This study takes Ji’an City as the research area,based on the second national land survey and the third national land survey,and uses the landscape pattern index and spatial autocorrelation analysis method to analyze the spatial and temporal characteristics of “non-grain” in Ji’an City.Secondly,in combination with the geographical conditions,natural factors,social and economic conditions and policy factors of Ji’an City,14 driving factors are selected to build the indicator system of “non-grain” of cultivated land,explore the driving mechanism of“non-grain” of cultivated land with the help of geographical detectors,reveal the internal causes of “non-grain” of cultivated land,put forward the existing problems of “non-grain” of cultivated land and targeted countermeasures and suggestions,and provide reference for preventing excessive “non-grain”.The specific research results are as follows:(1)The total “non-grain” arable land in Ji’an is 103,477.58 hectares,and the “non-grain”rate of arable land in 2019 is 23.38%,which is smaller than the overall national level.In agricultural restructuring,the proportion of “non-grain” arable land flowing to garden land and forest land is larger,among which the area of engineering restoration category accounts for the majority.(2)The area of "non-food" arable land in Ji’an shows a spatial pattern with central Taihe and Ji’shui counties as the center of high values,followed by southeast,southwest,and east,and scattered in low value areas.In terms of the non-foodization rate,the distribution pattern is high in the southwest and low in the northwest and east,and the area and rate of "non-foodization" show a decreasing trend under different protection policies.Through landscape pattern index analysis,it is found that the aggregation degree of food cropland is stronger than that of "non-food" cropland,and among "non-food" cropland,the aggregation degree of recoverable cropland is the highest,which is more influenced by human production activities.Through spatial autocorrelation analysis,it is found that there is an obvious positive spatial correlation between the "non-food" rate of arable land in Ji’an,with high-high aggregation(HH)and low-low aggregation(LL)being the main types of spatial aggregation,and the "non-food" rate in the scope of different protection systems is higher than that in other areas.The "non-food" rate within different protection systems shows different spatial clustering characteristics.(3)The pattern of “non-foodification” in Ji’an is the result of a combination of factors.From the results of the detection of divergence factors in the geographic probe,it is concluded that policy factors and socio-economic factors have a greater influence on the “non grain” of arable land,and natural factors and location factors have a greater influence on the “non grain”of arable land.The results show that policy factors and socio-economic factors have a greater influence on the “non grain” of cropland,while natural factors and location factors have some influence on the “non grain” of cropland.Among them,the greatest influence of each driver on the “non grain” of cropland is the level of “non grain” within the permanent basic farmland(0.62),and the least influence is the distance of cropland from water source(0.13).From the results of the interaction factor detection in the geographic probe,the interaction effect of any two factors on the level of “non grain” of arable land in Ji’an is enhanced,and the factors with more obvious interaction are topographic slope(X4)and urbanization rate(X10),soil p H value(X6)and total power of agricultural machinery(X11),per capita GDP(X8)and total power of agricultural machinery(X11),disposable income ratio of urban and rural residents(X9)and total power of agricultural machinery(X11),socio-economic factors are the dominant factors influencing “non grain”,the combined effect of socio-economic factors and natural factors is the second,and the combined effect of location factors and socio-economic factors is slightly lower.The combined effect of location and socio-economic factors is slightly lower,but also has an important influence on the level of “non grain” of arable land in Ji’an.(4)According to the problem of “non grain”,the proposed policy optimization path for the “non grain” of arable land should continue to implement the policy of arable land protection,improve the policy design of “non grain” and In the future,we should continue to implement arable land protection policies,improve the design of “non grain” policies,strictly control the change of arable land use,improve the ability of law enforcement officers,optimize the means of implementation,and enhance the effectiveness of government implementation,guide farmers to use resources rationally,and enhance farmers’ willingness to grow food,create a favorable policy environment,improve the institutional guarantee mechanism of arable land protection policies,accurately monitor the behavior of “non grain”,and promote agricultural modernization.