都市区与非都市区的城镇用地增长特征:以长三角地区为例

METROPOLIAN AND NON-METROPOLITAN URBAN LAND GROWTH IN THE YANGTZE DELTA REGION

作为人口与经济活动高度集聚的地区,都市区地域的发展和空间结构特征引起了大量关注。本文以长三角两省一市地区221个区县单元为研究对象,在划分都市空间单元类型的基础上,考察都市区与非都市区以及各类型都市区之间城镇工矿用地增长的差异,并据此探讨在我国特殊经济社会环境下都市区地域的空间发展规律。研究发现,不同地域单元在中心—外围关系上存在差异,都市区进入了均衡扩散阶段而非都市区以中心城市极化为主,孤立都市区的扩散效应较弱,非都市区地域的县域单元受到临近都市区的影响而呈现出不同的城镇工矿用地扩展特征。都市连绵区内不同亚区域存在发展阶段与空间关系上的差异,加剧了都市连绵区空间结构的复杂性。来自中心城市、外资拉动、县域经济内生的多重力量推动都市地域呈现独特的空间规律。

China has been experiencing at an unprecedented rate in urbanization and urban growth especially in coastal areas where cities and towns are highly concentrated since 1980s.This paper takes 221 counties in the Yangtze Delta region as typical urban regions in China,makes deep insight into the variance of metropolitan and non-metropolitan growth in urban land use on the basis of category definition,and discusses the distinct development path of urban region in China.Based on category definition,urban land utilization analysis supports that,center-periphery relationship distinguished in different areas,with a balanced diffusion in metropolitan area and centripetal polarization in non-metropolitan areas.Among metropolitans,regional variation also exists.Isolated metropolitans show weaker influences on the periphery than interlocking metropolitans,the outer counties of former ones get more pull from centers than the latter ones.As a transitional category from non-metropolitan to metropolitan area,isolated metropolitans have similarity with its formal stage in the outstanding central city and low developed periphery.Impact from central city,foreign investment and internal force of county economy shaped distinct spatial relationship of urban region in the Yangtze Delta region.This paper also suggests that,region authorities should pay large attention to the discipline of regional development concerning metropolitan characteristics,and promote integrated regional development in the aspects of industry distribution,infrastructure sharing and economic cooperation.Beside,this paper lays emphasis on the phenomenon of growth rate differentiation among region categories;however apparent growth rate cannot tell the whole growth discipline,while initial urban land scale and total land supply amount also play a remarkable role in urban growth.