基于信息熵的兰州市用地结构动态演变及其驱动力

在GIS技术支持下,以兰州市建成区1959-2004年城市用地结构及相关经济社会统计数据为基础,借助系统论中的信息熵原理,揭示了兰州市建成区用地结构动态演变特征,阐述了影响建成区用地结构动态演变的主要自然、政策、经济社会和城市规划等驱动力,最后利用主成分和多元线性回归相结合的分析方法,对该区用地结构动态演变的经济社会主要驱动因子进行了分析与探讨。研究表明:该区用地结构动态演变的信息熵H经历了三个阶段:1959-1979年持续下降阶段与1979-2001年剧烈上升后缓慢增长阶段,以及2001-2004年急速回落阶段;均衡度在持续下降,稳定上升之后,在后期有所回落,优势度相反;用地结构无序化的剧烈变化期位于1979-1989年间,之后至2001年,无序化进程缓慢;影响兰州市建成区用地结构动态演变的主要经济社会驱动力为:城市经济社会发展阶段和城市建设投资规模、人口增长及就业状况和产业结构比例、城市建设水平等等,其中前两者影响更为明显。

Dynamic evolution and driving force of the land use structure in Lanzhou City based on the information entropy

Under the support of GIS,based on the data of 1976 and 2001 land-use map,and satellite images topographical map of Lanzhou City,Gansu Province,China,as well as the survey,interview and concerned literature of Lanzhou City urban land use structure as far as 1959-2004 and the associated economic and social statistics,and,the characteristics of dynamic evolution of land use structure in Lanzhou were expounded utilizing the information entropy principle of systematic theory.Furthermore,the driving forces to influence the main characteristics in terms of natural,economic,social,urban planning and policy factors were explored.Finally,in virtue of analytical methods on the principal component and multivariate linear regression,the main economic and social driving factors were analyzed and discussed for dynamic evolution of land use structure in the region.The results show that dynamic evolution of information entropy has gone through three stages in the region,that is,1959-1979 continual decline stage and 1979-2001 slowly growing stage after sharply rising,and 2001-2004 sharply decreasing stage.The degree of balance and dominance shows the corresponding fluctuations at the same time.Generally speaking,the degree of balance firstly drops,then steadily goes up,and at last decreases somewhat.The degree of dominance takes on the other way round.The main driving forces,which affects dynamic evolution of land use structure in the district of Lanzhou City,include economic and social development and the government's policy control,as well as the natural environment and urban planning constraints.