摘要
不透水面是影响区域空间规划和生态建设的重要因素,可以有效反映城市发展变化。徐州市作为淮海经济区中心城市,经历了快速城市化阶段并向生态园林城市转型,刻画其城市不透水面变化具有典型意义。通过比较4个光谱指数(不透水面指数ISA、城市建成区指数BUAI、生物物理成分指数BCI、增强型归一化差值不透水面指数ENDISI)以确定不透水面信息提取的最佳指数;引入分形理论和景观生态学方法,从行政区、剖面线、景观格局指数多方面分析徐州市中心城区(包括8个片区)不透水面2000、2007和2017年3个时期的时空异质性,旨在揭示其在城市化背景下的时空演变规律,为城市未来发展提出建议。结果表明:(1)BUAI提取研究区不透水面的精度最高(Kappa系数=0.81),远高于其他3个指数,可有效提取多时相不透水面信息;(2)各个片区的不透水面存在差异,老城片区(商业金融中心)和金山桥片区(经济技术开发区)的不透水面比例一直较高;BUAI剖面线揭示了城市扩张的方向特征,研究区的不透水面向东和向东南方向有所发展;(3)研究区不透水面景观格局呈破碎化趋势,由填充式增长转变为分散式扩张,不透水面景观形态趋向复杂化和不规则化,景观格局的异质性增强。该研究可以为城市未来发展和土地利用规划提供科学依据。
Impervious surface is one of the key factors impacting regional spatial planning and ecological development, thus effectively indicative of change in urban development. As the central city of Huaihai economic zone, Xuzhou has been shifting its focus from rapid urbanization to ecologicalization;there, therefore, are broad implications for characterizing the dynamics of its urban impervious surface. In this study, we first identified the best impervious surface extraction approach by comparing four different impervious surface indices, namely ISA(Imperious Surface Area Index), BUAI(Built-up Area Index), BCI(Biophysical Composition Index), and ENDISI(Enhanced Normalized Difference Impervious Surface Index). By combining the fractal theory and a landscape ecology approach, we then analyzed the spatial-temporal heterogeneity of impervious surface of Xuzhou urban area(consisting of eight districts) from 2000 to 2007 and to 2017, from the perspectives of administrative division, profile lines, and landscape pattern indices, in order to characterize the dynamics of impervious surface in the context of urbanization, and provide suggestions for the future development of Xuzhou city. Results show that(1) BUAI can map impervious surface effectively and its resultant accuracy(Kappa coefficient=0.81) was by higher than the other three indices;that(2) while each district varied in impervious surface area with the Old City district(mainly for business and financial purposes) and Jinshanqiao district(the economic and technological development zone) having the highest proportions of impervious surface, growing impervious surface has been observed in the east and southeaster parts of the study area according to our BUAI based profile line analysis;and that(3) the impervious surface landscape pattern of the study area tends to be fragmented(from filled growth to dispersed expansion), complex, and irregular, suggesting its increased overall heterogeneity. Our study can provide a scientific basis for the urban development planning and land use planning.
作者
李涵
李龙
张婷
陈龙乾
LI Han;LI Long;ZHANG Ting;CHEN Long-qian(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;Department of Geography,Vrije Universiteit Brussel,Brussels 1050,Belgium)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2019年第3期668-680,共13页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金项目(51174207)
关键词
光谱指数
不透水面
景观格局
时空异质性
徐州市
spectral index
impervious surface
landscape pattern
spatio-temporal heterogeneity
Xuzhou city
