快速城市化背景下的建设用地扩展类型格局及驱动力分析

过去30a是深圳经济持续高速增长的阶段,也是深圳市建设用地快速扩展的重要时期,因此对建设用地时空格局的研究,可加强对这一区域人类干扰土地覆被系统强度的认识。根据建设用地扩展斑块和旧有建设用地斑块之间的边界拓扑关系,把建设用地扩展类型分为填充型扩展、边缘增长型扩展和外延型扩展3种,并对深圳市3个辖区、5个时间段建设用地及其扩展类型的分布和变化进行了分析。研究表明:人口、经济、政策等因素影响着建设用地数量和扩展方式的变化。由前期外延型为主到后期填充型为主的扩展方式的转变,体现着深圳市土地集约节约利用水平的提高。

Analysis of Different Construction Land Expansion Types and Their Driving Force

The past 30 years was the period when the economy grew continually,also the period when the built-up area expanded dramatically.The spatio-temporal pattern of construction land reflected the extension,intensity and frequency of the regional human intervention and affects the process of ecological systems.The overlay of the construction land maps for two adjacent years was used to generate the sprawl categories map.The main three sprawl categories named infilling sprawl,edge-expansion sprawl and outlying sprawl were calculated and analyzed about their distribution and the change over the study years in different counties.Population,economy and policy played an important role in the built-up area number and its expansion types.The alternation of the dominative built-up area expansion types,the outlying sprawl in the beginning period and the infilling sprawl in the later period,indicated the enhancement of land saving and intensive use level in Shenzhen City.