Spatial Differences And Influences Of Cultivated Land Pressure In Yunnan Province

Cultivated land resources are the basis of grain production and directly related to a country or regional food security issues,and social harmony,political stability,economic sustainable development,and play an irreplaceable basic role to agriculture and the national economy.In recent years,with the increasing of the total population,the rapid advance of urbanization and industrialization,the pressure of cultivated land resources has become more and more serious,which seriously affects the sustainable development of human society.In this context,a comprehensive understanding and appropriate evaluation of the pressure of cultivated land resources has become one of the hot spots in the field of land resource research.The overall quality of cultivated land is not high,and the slope cultivated land is the main in Yunnan Province.As of the end of 2014,the most serious soil erosion in Yunnan Province,not suitable for cultivation> 25 ° steep slope up to 831,700 hm2 of cultivated land is accounting for 13.39% of all cultivated land.Therefore,it is urgent to strengthen the study of cultivated land pressure in mountainous provinces.It is not only helpful to guide the protection of limited arable land resources(especially high quality arable land resources),but also alleviate the pressure of man-land system.Therefore,based on the data of land use change and socio-economic data of 16 counties in Yunnan Province,this study uses the improved model of cultivated land pressure index in mountainous areas to conduct a further analysis of cultivated land pressure in Yunnan Province in 2009-2014,The specific analysis of the content of three aspects:(1)Quantitatively and qualitatively analyzing temporal and spatial characteristics and trends of cultivated land pressure in Yunnan Province;(2)Integrating ESDA and coefficient of variation to analyze the spatial distribution and spatial correlation of cultivated land pressure in Yunnan Province;(3)The paperestablishes the econometric model to analyze the influence degree of different influencing factors of cultivated land pressure on the basis of regression analysis.The results showed that:(1)The overall cultivated land pressure in Yunnan Province was at a low pressure level from 2009 to 2014,although there was a certain pressure,the pressure index showed a slight decrease trend and slowed down year by year.(2)The change trend of cultivated land pressure index of each state(city)basically accorded with the change trend of the whole province,all showed the decrease of different amplitude.Although the cultivated land pressure index of the state(city)has declined,the pressure level of cultivated land is almost unchanged,while the pressure level of cultivated land in the state(city)has been changed.(3)There are obvious regional differences in cultivated land pressure in Yunnan,and the state(city)with large arable land pressure is the economically developed areas such as Kunming and Yuxi in Yunnan Province,and natural geographical conditions quite harsh areas such as Zhaotong in northeastern Yunnan and Nujiang in northwest Yunnan.The area of low pressure of cultivated land is mainly distributed in the southwestern border areas such as Dehong and Baoshan which have favorable natural conditions.(4)From the result of variation coefficient calculation,it is found that the coefficient of variation of Yunnan Province increases steadily from 2009 to 2014,which indicates that the regional difference of cultivated land pressure is increasing.The global Moran index did not pass the significance test,which indicated that although the spatial distribution of cultivated land pressure in Yunnan Province was different,there was no significant spatial correlation.(5)There are obvious differences in the influence degree of cultivated land pressure.The internal factors of resource endowment and cultivated land input play a decisive role in cultivated land pressure,while external factors such as economic level and social development are indirect influencing factors.Finally,on the basis of the above analysis results,a measure system to improve the productivity of cultivated land in Yunnan Province was put forward according to the main problems in cultivated land production.