摘要
以多源夜光遥感影像为数据源,运用景观格局指数、地理探测器等方法,以长江经济带三大城市群为实验样区,研究了70个城市扩张的时空分异特征和驱动机理。结果表明:(1)三大城市群城市扩张的时空分异特征各有差异,长江三角洲城市群内城市的景观格局相对破碎,建成区集约化程度高,前期扩张速度最快,长江中游城市群和成渝城市群内的城市扩张特征较为一致,前期扩张速度慢,城市形态较为规整紧凑,中后期扩张速度加快,结构趋于分散;(2)三大城市群内各城市在第Ⅰ、Ⅱ阶段扩张的首要驱动因子分别为人口、经济和交通,第Ⅲ、Ⅳ阶段均为经济维度下的二级因子;(3)城市扩张是多因素共同作用的结果,多个因子交互作用的解释力普遍强于单一因子,并呈现出双因子增强和非线性增强的交互效果。
Taking the multi-source nighttime light remote sensing images as the data source,this paper conducted comprehensive experiments with the 70 cities of three major urban agglomerations in the Yangtze River Economic Belt as the samples and used methods such as landscape pattern index and the Geo-detector to reveal the spatio-temporal heterogeneity and driving mechanism of the urban expansion.The results showed that:(1) There were obvious spatio-temporal discrepancies among the urban expansion of the three major urban agglomerations. In the Yangtze River Delta urban agglomeration,the urban landscape pattern was relatively fragmented,with a high degree of intensification of urban built-up areas and the fastest expansion rate in the early stage,the middle reaches of the Yangtze River and the ChengduChongqing urban agglomeration had relatively consistent expansion characteristics,with a slow expansion rate and a more regular and compact urban form in the early stage,and a faster expansion rate and a more dispersed structure in the middle and late stage;(2) The primary driving factors of the urban expansion in the three urban agglomerations in stages Ⅰ and Ⅱ were population,economy and transportation respectively,while they all switched to the secondary factors under the economic dimension in stages Ⅲand Ⅳ;(3) Urban expansion was the result of multiple factors. The explanatory power of the interaction of multiple factors was generally stronger than that of a single factor,and it showed the interaction effect of two-factor enhancement and nonlinear enhancement.
作者
周侗
王佳琳
ZHOU Tong;WANG Jia-lin(School of Geographical Sciences,Nantong University,Nantong 226007,Jiangsu,China;School of Economics and Management,Nantong University,Nantong 226019,Jiangsu,China)
出处
《国土资源科技管理》
2022年第3期24-35,共12页
Scientific and Technological Management of Land and Resources
基金
国家社会科学重大基金项目(19ZDA189)
南通市社会科技民生面上项目(MS12020075)。
关键词
城市扩张
夜光遥感
地理探测器
长江经济带
urban expansion
nighttime light remote sensing
Geo-detector
Yangtze River Economic Belt
