近20年湖南省耕地开发强度时空分异研究

STUDY ON THE SPATIAL AND TEMPORAL VARIATION OF CULTIVATED LAND DEVELOPMENT INTENSITY IN HUNAN PROVINCE IN THE PAST 20 YEARS

关键词:  耕地开发强度  时空分异  重心模型  冷热点分析  湖南省

Key words:  cultivated land development intensity  time and space differentiation  center of gravity analysis  cold hot spot analysis  Hunan province

摘要:

目的 以县域为研究单元，对湖南省耕地开发强度进行测度，研究近20年来湖南省耕地开发强度时空变化特征。方法 文章运用变异系数、泰尔指数、重心分析、冷热点分析等多种方法揭示1999—2017年湖南省耕地开发强度时空格局演变特征。结果 （1）耕地开发强度总体上呈增长趋势，其区域差异性主要是由组间差异造成，其中湘南片区对组间差异的贡献率最大。（2）湖南省县域强度阶段性特征以上升为主要趋势，耕地开发强度空间分布不平衡，一级区和二级区主要分布于武陵、南岭和罗霄山脉等地势较高山区县域；三级区和四级区集中分布于中部往南北向延伸的地势较为平坦的地带。（3）耕地开发强度重心存在着从东北向西南转移的趋势，空间波动较小。（4）冷热点区域整体呈现出“热点区—次热点区—次冷点区—冷点区”的圈层结构分布形态，空间集聚格局相对稳定。结论 该研究结果为研究区制定区域差别化的耕地开发强度管控政策和农业空间管控决策提供更直观的参考。

Abstract:

Taking county as the research unit, this research is intends to measure the cultivated land development intensity of Hunan province and study the characteristics of spatio-temporal changes of cultivated land development intensity in Hunan province in the past 20 years. Using various methods such as coefficient of variation, Theil index, center of gravity analysis, and cold and hot spot analysis to reveal the evolutionary characteristics of the spatial-temporal pattern of the intensity of cultivated land development in Hunan province from 1999 to 2017. The results showed that: (1) The development intensity of cultivated land generally showed an increasing trend, and its regional differences were mainly caused by differences between groups, among which the southern Hunan region had the largest contribution rate to the differences between groups. (2) The main trend of the phase characteristics of county intensity in Hunan province was rising, and the spatial distribution of cultivated land development intensity was not balanced. The first and the second levels were mainly distributed in the higher mountainous counties such as Wuling, Nanling and Luoxiao Mountains; the third level and the fourth-level districts were concentrated in the relatively flat terrain extending north-south in the central part. (3) The center of gravity of cultivated land development intensity had a tendency to shift from northeast to southwest, with small spatial fluctuations. (4) The cold and hot spot area as a whole presented a circle structure distribution pattern of "hot spot area-sub-hot spot area-sub-cold spot area-cold spot area", and the spatial agglomeration pattern was relatively stable.To conclude, the research results can provide reference for the study area to formulate regional differentiated cultivated land development intensity control policies and agricultural space control decisions.