Study On Trade-off And Synergy Relationship Of Cultivated Land Multifunction

In order to identify the correlation degree of multi-function of cultivated land and the correlation between different time and space,this paper is based on land use change survey data and statistical yearbook,by using the method of cold hot spot analysis and partial correlation analysis to evaluate the production function,ecological function and landscape function of cultivated land in Shanghai Qingpu District in 2010 and 2016 and to divide into four types of functional areas.Identify spatio-temporal associations between the partitions and the functions of the entire region,combined with urban planning,land remediation and land monitoring,it provides suggestions for the direction of cultivated land regulation in Qingpu District.The results show that:(1)From the spatial point of view,the spatial distribution of each function of cultivated land was significantly different,the cultivated land mufti-function was better in the east and the north was poor.The high-value areas of production function and ecological function are mainly concentrated in the east,the high-value areas of landscape function are mainly concentrated in the southwest,the low-value areas of various functions are mainly concentrated in the north.From the time point of view,production functions and ecological functions have been significantly improved,landscape function changes are not obvious,and some towns have declined slightly from 2010 to 2016.(2)The hot and cold spots of production function and ecological function are highly consistent in space,showing that the west is cold and the east is hot,landscape functions are opposite to production and ecological functions,showing hot in the southwest and north and cold in the east.From the perspective of time changes in hot and cold spots of cultivated land,production function and ecological function hot-spots increased,and landscape hot-spots decreased.According to the spatial distribution of hot-spots in 2010 and 2016,it is divided into four types of dominant functional areas.The production function advantage areas are concentrate in the east of Qingpu District,the ecological function advantage areas are concentrated in thesoutheast area,and the landscape function advantage areas are concentrated in the west of Qingpu District,the low value areas of each function are concentrated in the northwest.(3)From the perspective of time change,the production-ecological function and production-landscape function in 2010 and 2016 are synergistic relationship,the synergistic relationship between production and ecological functions is enhanced,and the synergy between production and landscape functions is weakened.The ecological and landscape function was synergistic relationship in 2010 transformed into a trade-off relationship in 2016.The trade-offs and synergies relationship between the functions of each dominant functional arable land have certain differences compared with the whole region.From the perspective of spatial changes,all functions were synergistic in 2010,the production-ecological function was a synergistic relationship in 2016,the ecological-landscape function was a trade-off relationship,and the production-landscape function had no spatial correlation.(4)Production function advantage area should strengthen the construction of high standard basic farmland and agricultural infrastructure.Ecological function advantage zone gives priority to the development of ecological protection agriculture and development of green and sustainable production mode.Landscape function advantage area develops urban leisure agriculture and mode of “agriculture +”.Each function low value area is located in the high standard basic farmland continuous area,which plays a major role in production function,the main direction of improving production function is to reduce the pollution of industrial plots to cultivated land,to raise the pH value,and to reduce the degree of salinization of vegetable fields in facilities.