The spatiotemporal relationship between cropland conversion and high-yield and stable-yield characteristics in Anhui Province from 2000 to 2020
[Purpose]The spatiotemporal characteristics of cropland/non-cropland conversion and the correlation with changes in grain production capacity in Anhui Province are discussed,which provides theoretical support for the scientific and rational coordination of local grain-land relationship to achieve the strategy of"storing grain in the land"in the major grain-producing areas in China.[Method]Based on the GlobeLand30 data of 2000,2010,and 2020,the methods such as cropland and non-cropland conversion rate,Lorenz curve and Gini coefficient,spatial autocorrelation analysis,mean-variation coefficient were used to analyze the spatiotemporal differentiation characteristics of cropland conversion quantity and mode,as well as the dynamic changes in grain production capacity from 2000 to 2020.Pearson correlation analysis,Kruskal-Wallis test,and Mann-Whitney test methods were applied to study the impact of cropland conversion on grain production capacity and reveal the differences in cropland conversion among counties with different grain high-yield and stable-yield types.[Result](1)The net outflow area of cropland showed a spatial pattern of"high in the north,differentiated in the center,and low in the south"with a significant decreasing trend in the second decade,and an expansion of the affected range.The high-high aggregation areas were distributed in the Huaibei Plain and the Jianghuai Hilly Region,mainly due to the urbanization's large-scale occupation of croplands.While the low-low aggregation area were distributed in the Wannan Mountain Area mainly due to the policy of"returning farmland to forest".(2)The grain production capacity was spatially formed as a high-yield and stable-yield belt around the Yangtze River embankment area and the Wannan Mountain area,a high-yield but unstable-yield contiguous area in the Jianghuai Hilly Region,and a low-yield and unstable-yield contiguous area in the Huaibei Plain.Moreover,the overall grain production capacity was basically stable.Furthermore,the cropland conversion had a significant impact on the high and stable yield levels of grain.(3)The outflow area of cropland was relatively small in both counties with the high-yield and stable-yield levels and counties with the low-yield and stable-yield levels.The conversion modes were primarily characterized by"0-0-0-0",which indicated that the cropland protection has been well-implemented in areas with stable grain productivity.[Conclusion]Anhui Province should strengthen the cropland conversion management according to local conditions,especially focusing on the protection and effective utilization of high-quality cropland in high-yield and stable-yield areas to ensure the sustainability of grain production.
cropland conversionhigh-stable yield typesGlobeLand30 datafood securityAnhui Province
NETL
NSTL
万方数据
