Spatial And Temporal Differences In Intensive Use Of Cultivated Land In The Huang-Huai-Hai Plain And Its Influencing Factors

China is a big agricultural country,agriculture occupies an important place in our country's social production and modernization construction.Food as a material basis for the development of our national economy,the food security issue is a major issue that relating to China's economic security and people's livelihood,the primary measures of protecting the food security is to protect the major grain producing areas.Huang-huai-hai plain is an important production base of food crops?cotton?oil in the country,contains the Chinese agricultural province of hebei,henan,shandong,jiangsu,anhui,its population and cultivated land accounts for one 5 of the country,made a prominent contribution to ensure national food security.With rapid economic and social development,some irresistible forces such as construction projects,agricultural structural adjustment and ecological returning farmland and natural disaster poses a threat to food security,it is time to promote intensive utilization of cultivated land.Huang-huai-hai plain occupies the important position in our country food security system,therefore,the study of space-time difference and its influencing factors of the level of intensive utilization of cultivated land in the plain,has important practical significance to understand the current situation of regional cultivated land intensive utilization and national food security.On the basis of summarizing the domestic and foreign research,this study to explore space and time variation law of the cultivated land intensive use level in the plain,clear the influenced factors and restricting factors of the level of intensive utilization of cultivated land,in the case of huang-huai-hai plain,using natural geography and social economic survey data,constructed cultivated land intensive utilization evaluation system and the influence mechanism analysis model,analysised cultivated land intensive use level about 340 counties of huang-huai-hai plain nearly 16 years,and putted forward countermeasures and suggestions about corresponding reasonable cultivated land intensive utilization and protection.First of all,in the case of huang-huai-hai plain,by county as the research unit,calculate cultivated land intensive use level of each county nearly 16 years;under the support of spatial analysis function in geographic information system,analysis spatial and temporal variations of cultivated land intensive use level in each district and county of huang-huai-hai plain.The second,using the fishbone analysis the influence factors of the intensive utilization of cultivated land,construct GeoDetector model natural factors and social economicfactors imact on the level of intensive utilization of cultivated land of huanghuaihai plain,then quantitative analysis the perspective of influence mechanism of various influence factors.Finally,in view of the natural factors and social economic factors on the impact mechanism of cultivated land intensive utilization level,find out it restrictive factors,and put forward the corresponding countermeasures and suggestions.