Coupling Relationship Between Cultivated Land Use Efficiency And Ecological Security In Zhejiang Province

Cultivated land resource is a very important,scarce and non-renewable land resource.The coordinated development of cultivated land system is the foundation of consolidating food security,the foundation of agricultural production,and the premise of long-term sustainable development of rural economy and society.However,in the process of urbanization and industrialization,the expansion of urban land and the excessive use of pesticides and fertilizers have brought great pressure to the sustainable development of cultivated land system.The gradual deterioration of cultivated land ecosystem has an ineffable impact on the stability of land ecosystem,the sustainable development of rural areas and the stable development of social economy.Therefore,to ensure the coordinated development of cultivated land utilization efficiency and ecological security is an essential part of the overall promotion of rural revitalization.In this thesis,Zhejiang Province is taken as the research object.Firstly,the Super-SBM model based on non-expected output is used to calculate the cultivated land use efficiency of 11 prefecture-level cities in Zhejiang Province from 2007 to 2020,Secondly,the cultivated land ecological security evaluation index system of Zhejiang Province was constructed by DPSIR model,and the cultivated land ecological security of prefecture-level cities was evaluated.Thirdly,the coupling coordination model is used to study the relationship,analyze the existing problems of cultivated land utilization,and finally give corresponding suggestions according to the research results.The main conclusions are as follows:Cultivated land use efficiency: From the perspective of time series,the cultivated land use efficiency in Zhejiang Province has improved on the whole,but the improvement is not obvious,and there is a situation of decline in some prefecture-level cities.The improvement of cultivated land use efficiency is mainly attributed to the change of technological progress,and there is still a large room for improvement of technical efficiency.From the perspective of spatial distribution,the cultivated land use efficiency in northern and southern Zhejiang is better than that in central Zhejiang.The cultivated land use efficiency in central Zhejiang is basically in low efficiency area or low efficiency area,indicating that there is still a large space for improvement in central Zhejiang.Cultivated land ecological security: From the perspective of time series,the status of cultivated land ecological security in Zhejiang Province decreases first and then increases,but there is a situation of decline in some prefecture-level cities.From the perspective of spatial distribution,the cultivated land ecological security status in northern Zhejiang is better than that in central and southern Zhejiang,and the cultivated land ecological security status in central and southern Zhejiang is both at the sensitive level Ⅱ and the critical level Ⅲ.Coupling coordination between cultivated land use efficiency and ecological security:From the perspective of time series,the coupling coordination degree between cultivated land use efficiency and ecological security status in Zhejiang Province decreases first and then increases,but the coupling coordination degree between cultivated land use efficiency and ecological security status shows a decreasing trend in some prefecture-level cities.From the perspective of spatial distribution,the coupling coordination between cultivated land use efficiency and cultivated land ecological security in southern and northern Zhejiang was better than that in central Zhejiang.