The Spatial-temporal Changes Of Cropland Intensification And Large-Scale Utilization And Its Coupling Relation In China

Land is the primary natural resource for human survival and reproduction owing to its production and nourishing function,carrying function and ecological service.China has a large population base,making it become one of the basic national conditions.With the acceleration of industrialization and urbanization,the decrease of cropland area will become the long-term trend,and the contradiction between people and land becomes increasingly prominent.Under the goal of ensuring the national food security,the method of using existing cropland to increase grain production is of great concern.Research shows that cropland intensification and large-scale utilization of cropland have become one of effective ways to guarantee the social and economic development of China and the supply of agricultural products.In addition,the cropland intensification and large-scale utilization of cropland interconnect each other and the coordinated development degree of both determine the degree of modernization of agriculture.Understanding the spatial pattern of cropland intensification and large-scale utilization and their coordination degree in different parts,adjusting measures to local conditions of the achieve land potential and increasing the utilization level of different regional cropland has important practical significance.This research evaluates the cropland in china as the study target,using statistical data,GlobeLand30-Cropland datasets and other data to create the model to value cropland intensification and large-scale utilization in 2000 and 2010.Then analyze the spatial distribution and its change from at county level,province level and agricultural level,respectively.Analyzing the spatial agglomeration characteristics of intensification and large-scale utilization at province level based on spatial autocorrelation model.Based on coupling model(coupling degree,coupling coordination degree and coupling relative degree of development)the degree of coordinated development is explored.The main conclusions are as follows:(1)In the eastern region,the agricultural economy is strong and the cropland intensification is relatively high,while the cropland intensification in the northwest and southwest regions is relatively low.For the main grain producing areas,the cropland intensification is higher than other areas.The cropland intensification indicates a certain degree of spatial clustering showing that the low value of the west gathers and the eastern high values gather.In the past 10 years,the development of economic level has also contributed to the improvement of cropland intensification.In the southwest,northwest,northeast and other regions,the level of cropland intensification has been greatly improved.(2)There are obvious differences between distributions of large-scale utilization of cropland.large-scale utilization in the south is low,and the large-scale utilization in the north is higher.For the main grain producing areas,the level of large-scale utilization is higher than that of other regions.It also reflects the large-scale utilization of the spatial clustering situation.In the past 10 years,due to the development of agricultural land consolidation,the level in the south has increased slightly,while the north has decreased,especially in Inner Mongolia.In addition,the large-scale utilization of cropland in the main grain-producing areas is relatively stable,and there is no obvious fragmentation in those areas.(3)The coupling degree is high in the whole nation.From the point of coupling coordination,high value areas main distribute in coastal economically developed areas and traditional agriculture developed area,but the northwest and southwest is poor.In addition,it can be seen from the relative coordination degree that the large-scale utilization in the southern region is low,but the intensification is higher,and the north shows the opposite trend.Due to the difference of coupling coordination degree and relative degree of coordination,all counties in the nation are divided into 7 different coupling models.The development of our country is mainly coordinated development,among which the fifteenth category is the most and mainly concentrated in the south,which indicates that the development coordination of the counties in the south of China is better.