云南省地级城市近20年空间格局演变

Urban Spatial Pattern Evolution of Prefecture-level Cities in Yunnan Province over the past 20 Years

以云南省16个地级城市为研究区域,基于2000-2017年6个时间段的遥感影像、GDP、人口等数据,通过城市面积、扩展面积、扩展速度、扩展强度、用地增长弹性系数、空间扩展类型、紧凑度等7个评价指标来揭示云南省近20年城市扩展空间演变规律。结果表明,(1)空间格局上,在这17年间城区规模呈直线攀升,且城市扩展呈现出明显阶段性和地域差异性。(2)用地效益上,城市用地增长弹性系数均大于最优值,城市土地的扩展远大于城市人口的增长,二者出现不协调。(3)扩展类型上,在2000-2010年基本为外延型扩展,2011-2017年内部填充型扩展城市增多。(4)空间形态上,城市紧凑度呈现出“西高东低”的特征,而时间进程上表现为西南部地区先降后升,东部地区逐渐提升。

Selected 16 prefecture-level cities in Yunnan as research areas,employed remote images,GDP and population data in the six periods dating from 2000 to 2017 to interpret the spatial evolution characteristics of urban expansion in Yunnan Province during the last 20 years,the comprehensive monitor model and evaluation index system was built up based on seven dimensions,which are urban scale,expansion area,expansion rate,expansion intensity,elasticity coefficient of urban land expansion,extension type and compactness.The results showed that,(1) on spatial pattern,Yunnan extended in straight-line tendency during the 17years,but emerged as a prominent-phase and geographical-difference manner.(2) On land-use efficiency,the elasticity coefficient of urban land growth was higher than optimum value,attributed that the expansion of urban land far exceeded the growth of urban population,with indicating disharmony.(3) In terms of expansion types,it was basically extension expansion from 2000 to2010,and internal filling expansion cities increased from 2011 to2017.(4) On spatial morphology,the urban compactness represented the characteristics of “high west-low east”in spatial area,and on time sequence,the southwest region transformed from falling to arising coupling with the eastern region improved gradually.