Research On The Temporal And Spatial Changes Of Cultivated Land Multi-Function Trade-Offs And Synergy In Hunan Province

The natural resource attribute of cultivated land determines the objective existence of the multi-functionality of cultivated land,and the productive activities of human society make the multi-functionality of cultivated land appear,and the multi-functionality of cultivated land exists because of the utilization activities of human beings and is influenced by the human social and economic system,the concept consciousness factor and the carrying capacity of the cultivated land ecosystem.The functions of arable land are interrelated and interact with each other,and it is of great significance to explore the trade-off and synergy of the multifunctionality of cultivated land,and to formulate the differentiated management policy of the utilization of cultivated land and to reduce the trade-off of each function to improve the synergy.On the basis of a deep understanding of the multi-functional connotation of cultivated land,this paper divides the multi-functionality of Hunan Province into six typical functions,such as material output,labor load bearing,social stability and maintenance,family economic contribution,national economic contribution and ecological restoration function,and explores the space-time changes of multi-functional trade-off and synergy of cultivated land in Hunan Province by means of correlation analysis and spatial correlation analysis.The main conclusions are as follows:(1)From 2000 to 2018,the individual functions of arable land in various counties in Hunan Province have changed significantly.The material output function of arable land has shown a rapid increase trend,and the labor carrying function and national economic contribution function have shown different degrees of weakening trends.,The family’s economic contribution function and ecological restoration function showed a trend of first strengthening and then weakening.In terms of spatial distribution,the material output function of arable land has gradually increased from western Hunan to central Hunan and eastern Hunan,the labor carrying function has weakened from western Hunan to central Hunan,and southern Hunan in eastern Hunan.The function of maintaining social stability is from northwest Hunan to central Hunan,Southeast Hunan is gradually increasing,and the national economic contribution function is weakening from the northwest of Hunan Province to the southeast.The ecological restoration function is stronger in the western part of Hunan,and the function of the northeastern part of Hunan is weak.(2)Judging from the correlation coefficients of various functions of cultivated land in various counties from 2000 to 2018,the material output function and the carrying capacity of labor,the maintenance of social stability,and the function of family economic contribution have shown a trade-off relationship that first increased and then decreased during the 18 years.The gradual weakening of the synergy relationship,the first strengthening,then weakening and then strengthening the same relationship;the labor carrying function and the social stability maintenance,the national economic contribution,and the ecological restoration function respectively show a weak and stable trade-off relationship,a relatively stable weak coordination relationship,Strong synergistic relationship;ecological restoration function,material output function,and social stability maintenance function all show a weakened tradeoff relationship.(3)The results of the trade-offs and synergy of the individual functions of the cultivated land show that there are more counties with synergy of material output functions,and most of the counties with enhanced synergy are located in eastern Hunan and southern Hunan.Counties with weakened relations are mainly distributed in western Hunan;from 2000 to 2010,counties with enhanced labor-carrying function coordination are distributed in western Hunan and the number is gradually decreasing;counties with enhanced national economic contribution function coordination.The number of counties with enhanced functional synergy of national economic contribution increased gradually from 2005 to 2018;the number of counties with enhanced and weakened ecological restoration functions has a decreasing trend.Counties with enhanced synergy are located in western Hunan,and those with weakened synergy The counties are located in northern Hunan.The results of the spatial correlation changes of multi-functional bivariate trade-offs and synergy show that the material output function and the labor-carrying function show a gradually decreasing trade-off relationship,and there are more counties in the trade-off relationship in western Hunan,southern Hunan,and eastern Hunan;Material output functions and social stability maintenance functions show weakened synergy.Counties with enhanced synergy are concentrated in eastern Hunan,and counties with weakened synergy are mostly distributed in western Hunan;material output functions It shows a weakened trade-off relationship with the ecological restoration function;the labor-carrying function and the social stability maintenance function show a trade-off relationship,and the spatial distribution is relatively scattered;the number of counties showing an enhanced synergy between the laborcarrying function and the national economic contribution function is greater Many of them are mainly distributed in western Hunan;labor-carrying function and ecological restoration function show a weakened synergistic relationship,and the counties with enhanced synergistic relationship are mainly distributed in western Hunan;social stability maintenance function and ecological restoration function show a trade-off relationship,Spatially concentrated in the western and northern parts of Hunan.