地势对洞庭湖生态经济区城镇化空间格局的影响

The Impact of Terrain Features on Spatial Pattern of Urbanization of Dongting Lake Ecological Economic Zone

洞庭湖生态经济区的社会经济状况受水环境影响明显,而该区各县域水环境状况与其地势密切相关。从基于卫星数据的全国数字高程模型(DEM)中提取洞庭湖生态经济区各县域高程信息,利用SPSS等软件对各县域的低平原指数(LPI)与人口和经济城镇化率进行多模型回归分析。结果表明:各县域的城镇化率与其低平原指数呈现出显著的'抛物线型'相关。这种相关性揭示了洞庭湖生态经济区基于地形基础和水文环境影响而形成的'中部区域和外围区域低、边缘区域高'的城镇化空间格局。这种空间格局体现了社会经济的自然烙印,更是未来生态经济区建设应该关注的核心领域。

Dongting Lake is a water-carrying lake that acts a role of modulating and storing floodwater. For a long period,socio-economic conditions of counties in Dongting Lake Ecological Economic Zone have been affected significantly by aquatic environments, which are associated with corresponding terrain features. This article extracts the data of elevation of each county in Dongting Lake Ecological Economic Zone using Digital Elevation Model(DEM) and analyes the relationship between the population and economic urbanization index and the low plain index(LPI) by the use of multiple regression analysis. The results indicate that county’s urbanization rate and its low plain index present an obvious parabolic correlation. This correlation reveals that plain and hillock region is higher than mountainous-hilly region and low plain region on the pouplation and economic urbanization rate in Dongting Lake Ecological Economic Zone which is influenced by terrain features and aquatic environments. This peculiar spatial pattern is closely related to the socioeconomic environment and is the main focus in the future construction of the ecological economic zone.