近40年安徽省耕地非农化时空分布特征及扩散路径

SPATIO-TEMPORAL DYNAMICS CHARACTERISTIC AND DIFFUSION TREND OF CULTIVATED LAND CONVERSION IN ANHUI PROVINCE IN RECENT 40 YEARS

关键词:  耕地  非农化  扩散路径  态势  安徽省

Key words:  cultivated land  non agriculturalization  diffusion path  situation  Anhui province

摘要:

目的 为探明区域耕地非农化时空变化特征及演变路径，实现对安徽省耕地资源的保护及精准管理。方法 文章基于1980年、1990年、2000年、2010年和2020年安徽省LUCC数据，利用GIS空间分析手段，并借鉴重心迁移模型，探究安徽省县域耕地非农化过程及空间分布关系。结果 （1）近40年安徽省耕地非农化面积差异明显，４个不同阶段耕地非农化面积呈不断增长态势，耕地非农化强度趋向于皖中最大，皖北次之，皖南最小的格局。（2）县域耕地非农化速度等级空间分布地域差异性显著，皖南速度最快，皖北最慢。耕地非农化速度等级自小到大的重心点密度逐渐降低，整体波动方向为北西—南东方向，且波动幅度逐步提升。耕地非农化速度重心点的轨迹变化表明近40年安徽省耕地非农化历经了由中心向外围扩散又逐渐收敛的过程。（3）耕地非农化重心向东北方向迁移且距离不断变小，空间形态上呈现Y型，非农化路径表现为先远离后靠近的扩散态势。非农化重心一直偏安徽省几何中心以北。结论 揭示了安徽省耕地非农化演进过程及扩散路径，为政府部门掌握耕地变化以及保护耕地资源提供对策。

Abstract:

In order to realize the protection and accurate management of cultivated land resources, this research explored the temporal and spatial pattern and evolution path of regional cultivated land conversion. Based on the LUCC data of Anhui province in 1980, 1990, 2000, 2010 and 2020, and using GIS spatial analysis means and gravity transfer model, this paper explored the process and spatial distribution of cultivated land conversion in county areas of Anhui province. The results showed that: (1) In recent 40 years, the difference of cultivated land non-agriculturalizatio area in Anhui province was obvious. The cultivated land non-agricultural area in four different stages showed a continuous growth trend, and the intensity of cultivated land non-agricultural tended to be the largest in central Anhui, the second in Northern Anhui and the smallest in southern Anhui. (2) There were significant regional differences in the grade spatial distribution of cultivated land conversion rate in the county, the fastest in southern Anhui and the slowest in Northern Anhui. From small to large, the density of the center of gravity point of cultivated land conversion speed grade gradually decreased, the overall fluctuation direction was northwest-southeast direction, and the fluctuation range gradually increased. The trajectory of the center of gravity point of cultivated land conversion speed showed that in recent 40 years, cultivated land conversion in Anhui province had experienced a process of diffusion from the center to the periphery and gradual convergence. (3) The center of gravity of cultivated land non agriculturalization moved to the northeast, and the distance became smaller, showing a Y-shape in spatial form. The path of non agriculturalization showed a diffusion trend of first away and then close. The center of gravity of non-agricultural industrialization had always been north of the geometric center of Anhui province. It concludes that the evolution process and diffusion path of cultivated land conversion in Anhui province, and provides countermeasures for government departments to master cultivated land change and cultivated land resource protection.