Research On The Temporal And Spatial Variation Characteristics And Driving Factors Of Cultivated Land In China From 2001 To 2017

Farmland is the basic resource for human survival and life.The study on the temporal and spatial changes of Farmland is of great significance to national food security,ecological protection and social stability Since the reform and opening-up,China's economic development level has increased rapidly,and the total value of industrialized output has risen continuously.Along with the rapid development of the economy and industrialization,great changes have taken place in China's land use.China is the world's most populous country.China's cultivated land resources are limited and there are few people and land.The contradiction between the expansion of construction land and the protection of cultivated land is becoming more and more prominent In view of the increasing population,the continuous expansion of construction land,the extensive use of land,the destruction of the ecological environment and other problems,which are becoming more and more prominent,the study on the spatio-temporal change of cultivated land in China and its driving mechanism is of great significance to solve the conflicts of land use and promote the sustainable development of society.Based on the Modis Land Cover(MCD12Q1)product data of four periods in2001,2006,2011 and 2017,combined with Land use data,landform type data,dry and wet area data,precipitation data,nine agricultural regionalization data and socio-economic data of China,the spatio-temporal change characteristics of cultivated land in different physiognomy types,dry and wet regions,agricultural regions and economic regions of China were studied by using the methods of land dynamic attitude and annual land change rate Based on the qualitative analysis of the temporal and spatial changes of cultivated land in China from the perspectives of natural,social and economic factors and national policies,and using the principal component analysis method,this paper analyzes the different driving forces of cultivated land changes in 31 provinces and cities of Quantitative analysis The results show that:(1)from 2001 to 2017,the total amount of cultivated land in China decreased by 6989.01 km~2,among which,the newly increased cultivated land area was 148440.35 km~2,which mainly came from forest and grassland,and the lost cultivated land area was 155582.632 km~2,which was mainly converted into forest and grassland and construction land.(2)The change of cultivated land mainly occurred in mountainous area,humid area,arid and semi-arid area in north and eastern area,and the loss intensity of cultivated land gradually weakened in mountainous area and humid area during 2001?2006,2006?2011,2011?2017 The increasing intensity and speed of cultivated land in the arid and semi-arid areas of northern China gradually became stronger and faster,while the loss intensity and speed of cultivated land in the eastern areas became stronger and weaker at first.(3)natural factors such as different geological landforms and precipitation are the fundamental causes of cultivated land area change,and national socio-economic policy is the direct cause of cultivated land area change Economic DevelopmentFactor and population factor are the main social economic driving force of cultivated land area change in different regions.(4)This paper studies the driving factors of cultivated land change in 31 provinces and cities in China.The results show that the main driving factors of cultivated land change are economic development and the level of agricultural science and technology The results of this study are of great practical value to the protection of cultivated land according to local conditions,and can enrich the research results of cultivated land change and provide reference for relevant departments.