Spatial Relationship and Imbalanced Attribution of Cultivated Land Reclamation and Abandonment in China
The purpose of this study is to explore the spatial matching relationship between reclamation and abandonment of cultivated land,to provide a scientific basis for cultivated land protection and development.The research methods included remote sensing monitoring,spatial autocorrelation analysis,spatial imbalance index,geographical detector and enhanced regression tree modeling.The research results showed that:1)in the past 20 years,the annual average cultivated land reclamation in China had been 263.22×104 hm2,with an average annual reclamation rate of 1.39%,and was relatively concentrated in the northwestern,northeastern and southwestern regions.The annual average cultivated land abandonment was 226.68×104 hm2,with an average annual abandonment rate of 1.19%,mainly in the middle reaches of the Yellow River and the southwestern region.2)The spatial relationship between reclamation and abandonment of cultivated land is dominated by light imbalance and no imbalance,however,the number of counties with extreme imbalance and heavy imbalance has been increasing yearly.By 2020,the total proportion of counties with moderate,heavy and extreme imbalance reached 16.87%,mainly distributed in the northwest,the middle reaches of the Yellow River,the southwest and the southern coastal areas.3)High-high and low-low agglomeration were the main spatial agglomeration patterns of cultivated land reclamation and abandonment.Among them,high-high agglomeration areas were concentrated in the northwest,middle reaches of the Yellow River,southwest and southern coastal areas,while low-low agglomeration areas were concentrated in the northeast,middle reaches of the Yangtze River,southwest and northern coastal areas.4)Slope and average annual precipitation were the main natural resource drivers of the spatial imbalance between reclamation and abandonment of cultivated land,while the number of off-farm employees and the total power of agricultural machinery were the main socioeconomic drivers.It concludes that the spatial imbalance between cultivated land reclamation and cultivated land abandonment is complex and influenced by the interaction of natural and socioeconomic factors,and we should comprehensively determine the optimal utilization mode based on different scenarios and goals in the future,providing scientific basis for high-quality cultivated land protection.
cultivated land reclamationcultivated land abandonmentspatial relationshipimbalance indexboosted regression tree modeling