环境约束下的甘肃省城市土地利用效率时空差异及其演进特征

Spatial-temporal Differences of Urban Land Use Efficiency and Its Evolution Characteristics Under Environmental Constraints in Gansu Province

为了探究甘肃省城市土地利用效率时空差异和动态演进特征,构建环境约束下的城市土地利用评价指标体系,运用包含窗口的SBM-Undesirable模型和Kernel密度估计测算了2005-2016年环境约束下的甘肃省ULUE时空差异及其演进特征。结果表明:(1)甘肃省ULUE整体处于中等水平,城市间土地利用效率差异显著,整体呈现上升的趋势;(2)甘肃省ULUE空间分布上具有区域非均衡分布特征,中高效率城市不断增加;(3)甘肃省不同地区ULUE呈现南部民族>河西>陇东>陇中>陇南的区域差异特征;(4)甘肃省城市土地利用技术效率受到两种分解效率的影响,规模效率较纯技术效率对技术效率的贡献度较大;(5)甘肃省ULUE在地域空间上呈现两极分化的特征,区域空间差距呈现“加剧-减缓-加剧”的变化趋势。

In order to explore the spatial-temporal differences and dynamic evolution characteristics of urban land use efficiency in Gansu Province,the evaluation index system of urban land use under environmental constraints was constructed,and the spatial-temporal differences and evolution characteristics of urban land use efficiency was estimated by the SBM-Undesirable model with windows and Kernel density estimation in Gansu Province under environmental constraints from 2005 to 2016.The results showed that:(1)the total urban land use efficiency of Gansu Province was at a medium level,and the difference of land use efficiency between cities was observably remarkable,which showed an overall upward trend;(2)the spatial distribution of urban land use efficiency had distribution characteristics of regional non-equilibrium,and the number of cities with medium and high efficiency increased in Gansu Province;(3)the urban land use efficiency in different regions of Gansu Province presented the regional difference characteristics,which showed the order:the Southern nationalities>Hexi>Longdong>Longzhong>Longnan;(4)the technical efficiency of urban land use in Gansu Province was affected by two kinds of decomposition efficiency,and scale efficiency contributed more to technology efficiency than pure technology efficiency;(5)the efficiency of urban land use in Gansu Province was polarized in regional space,and the regional spatial disparity showed the trend of‘aggravation-slowdown-aggravation’.