兰西城市群县域土地利用效率时空差异研究

在考虑绿色发展内涵的基础上,运用SBM-Undesirable模型测度了2006—2018年兰西城市群县域土地利用效率值,并采用泰尔指数、空间自相关方法揭示其时空差异特征。结果表明:①2006—2018年兰西城市群县域土地利用效率稳步提升,区域差异先扩大后缩小。②兰西城市群县域土地利用效率呈现“中部高—外围低、西高东低、南北分异”的空间差异规律,两省域呈现“西—东”的递减规律。③兰西城市群县域土地利用效率空间集聚特征显著,局部范畴上高—高集聚区在中部地区较为典型,低—低集聚区出现由东南向西南的扩散现象。

Study on Spatial and Temporal Differences of Land Use Efficiency in Lanxi Urban Agglomeration

On the basis of considering the connotation of green development,using the SBM-undesirable model,this paper measured the county land use efficiency values of Lanxi urban agglomeration during 2006-2018,and revealed the spatial and temporal differences using the Theil index and spatial autocorrelation methods.The results showed that:①During the study period,the land use efficiency of Lanxi urban ag glomeration increased steadily,and the regional differences expanded from 2006 to 2010 and narrowed from 2010 to 2018.②From the spatial difference,the county land use efficiency of Lanxi urban agglomeration showed the spatial difference law of“high in the middle-low in the pe riphery,high in the west and low in the east,and different from the south to the north”.The county land use efficiency in Gansu region was al ways higher than that in Qinghai region,showing a declining law of“west-east”.③From the perspective of spatial association,there was a spatial positive correlation between county land use efficiency of Lanxi urban agglomeration and it had significant agglomeration characteristics.In the local areas,high-high agglomeration was typical in the central region,while low-low agglomeration spread from southeast to southwest,with the high-low agglomeration and low-high agglomeration more dispersed.