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1.
Identifying China’s leading world city: a network approach 总被引:3,自引:0,他引:3
This paper reports our research on China’s world cities. Formal network analysis of air passenger linkages for recent years
among China’s most populous cities and among many of the world’s largest cities allows us to identify the country’s leading
world city from among the leading Mainland candidates, Beijing, Shanghai and Guangzhou. We theorize our findings about China’s
world cities in relation to both global forces (and China’s increasing entanglement with them) and the policies and actions
of the national state. We examine the national and global urban network through a longitudinal, two-level analysis of airline
passenger travel for four time points between about 1990 and 2005. We show that Beijing was China’s leading world city at
the beginning of the time period, a status it lost nationally in as early as 1995, and then globally 10 years later. On the
other hand Shanghai became China’s leading world city, and it acquired this status first nationally in 2000, and then globally
in 2005. The changing status of the Chinese capital corresponds to the country’s increasing involvement with the capitalist
world economy. Shanghai’s ascendance as the leading world city in China may indicate that global forces have come to play
an increasingly important role relative to that of the developmental state.
相似文献
Michael F. TimberlakeEmail: |
2.
北京地区城市化过程与机制研究 总被引:84,自引:13,他引:84
在长时间序列高分辨率Landsat TM/MSS数据的支持下,对北京地区1975-1997年城市化基本过程和驱动机制进行了分析研究,基本结论如下;(1)北京地区城市化过程主要表现为中心大区和边缘次级中心区的面状城市化,中心大区和边缘次级中心区之间沿交通干线的线状城市化以及中心大区与边缘次级中心区之间的点状城市化3种基本模式,其中,中心大区、在城市边缘区的面状成都市化过程在区域内居于优势地位。(2)北京地区城市化过程和城市格局的形成是地形,交通等内在适应性因素和经济因素,政府行为,文化传统,突发事件等外在驱动因素共同作用的结果。其中,城市规划,产业发展政策等政府行为和3000年城市发展形成的旧有城市格局和古都风貌从根本上决定了现代北京城市发展的基本过程。 相似文献
3.
Martin Roberge 《The Professional geographer》2002,54(2):175-189
In‐stream gravel mining, massive bridge piers, and channelization have all contributed to the geomorphic instability of the Lower Salt River channel in Arizona. Dam closure, changing dam operating rules, and the frequent modification of the channel bed have decreased our ability to predict the Salt River hydrology. Engineering practice has adapted to this situation and to a public that is increasingly intolerant of service disruptions by constructing larger bridges and extending levees. Building these larger structures may be counterproductive; future construction should not constrict the channel and should re‐establish a braided river to decrease the energy available to the system. 相似文献
4.
This article explores the possibility of urbanization‐ and irrigation‐induced increases in summer precipitation totals in central Arizona. Maximum precipitation impacts are hypothesized to occur downwind of the Phoenix area in the Lower Verde basin. Results from statistical tests indicate that summer precipitation totals in the Lower Verde basin are greater than totals in nearby basins. Precipitation totals in the basin also appear to be equivalent to totals at more monsoon‐impacted stations in eastern Arizona. While this research is preliminary, the results do provide encouraging evidence of the existence of anthropogenically enhanced summer precipitation in central Arizona. 相似文献
5.
城市化对北京平均气温的影响 总被引:40,自引:2,他引:40
本文利用北京(观象台)及周围几个气象台站月平均气温资料,滑动平均后,采用主成分分析方法,再进行倾向性分析,探讨了北京城市化对气平均气温的影响,估算对北京(观象台)气温记录的影响约为0.21℃/33a推断市中心二环路以内强烈地影响。 相似文献
6.
美国"阳光带"的崛起对中国西部城市化战略的启示 总被引:1,自引:0,他引:1
美国西部开发以城市化为先导,中国西部大开发本质上也是西部城市化。西部大开发战略应以城市为中心组织与落实。本文通过透视美国“阳光带”城市崛起的历史,尤其是产业集群的成功经验,提出中国西部城市化战略实施中应将培育地方产业集群作为推动城市化的重要战略方式和地方重要的公共政策工具。 相似文献
7.
Heejun Chang 《The Professional geographer》2004,56(2):240-257
This study investigates potential changes in nitrogen and phosphorus loads under a warmer and wetter climate, urban growth, and combined changes in the Conestoga River Basin and its five subbasins in southeastern Pennsylvania. A GIS‐based hydrochemical model was employed for assessing the sensitivity of the basins to the projected changes in 2030. Under the HadCM2 climate change scenario, mean annual nitrogen and phosphorus loads are expected to increase, with great increases in spring but slight decreases in fall primarily because of changes in monthly precipitation. When climate change and urbanization occur concurrently, mean annual nitrogen loads further increase by 50% in the most urbanizing subbasin. Point source nitrogen control could mitigate negative effects of climate and land use changes, reducing mean annual nitrogen loads to the contemporary baseline level. 相似文献
8.
During the period between 18 August and 22 September 2006, an ultraviolet
photometric O3 analyzer, a NO-NO2-NOx chemiluminescence
analyzer, and a quartz micro-oscillating-scale particle concentration
analyzer were simultaneously used for monitoring at three different heights
each at Beijing (325-m tower) and Tianjin (255-m tower). These towers belong
to the Institute of Atmospheric Physics (IAP) of the Chinese Academy of
Sciences (CAS) and to the Tianjin Municipal Meteorological Bureau,
respectively. These measurements were used to continuously measure the
atmospheric O3 and NOx volume-by-volume concentrations and the
PM2.5 mass concentration within a vertical gradient. When combined with
meteorological data and information on the variation of vertical
characteristics of the various atmospheric pollutants in the two cities,
analysis shows that these two cities were seriously polluted by both
PM2.5 and O3 during summer and autumn. The highest daily-average
concentrations of PM2.5 near the ground in Beijing and Tianjin reached
183 μg m-3 and 165 μg m-3, respectively, while the O3 concentrations reached 52 ppb and 77 ppb, and NOx concentrations
reached 48 ppb and 62 ppb for these two cities, respectively. The variations
in the daily-average concentrations of PM2.5 between Beijing and
Tianjin were demonstrated to be consistent over time. The concentrations of
PM2.5 measured in Beijing were found to be higher than those in
Tianjin. However, the overall O3 concentrations near the ground in
Tianjin were higher than in Beijing. NOx concentrations in Tianjin were
consistently lower than in Beijing. It was also found that PM2.5
pollution in Beijings atmosphere may also be affected by the pollutants
originating in and delivered from Tianjin, and that Ti 相似文献
9.
快速城市化地区水系结构变化特征——以深圳市为例 总被引:8,自引:4,他引:8
为了探讨城市化对水系结构的影响,应用深圳市1982、2002年的二期水系详查图,定量分析了水系长度、密度、分枝比、分枝能力和分维数等参数的变化特征。结果表明: 快速城市化过程中, 深圳市的河道总长度减少、密度减小, 河道数目减少, 特别是低级别的支流减少较多; 河道的分枝比和分枝能力都有不同程度的弱化, 单个水系片区和全市的河流分维数都下降,河流具有简单化的趋势, 河流的多元化特征削弱; 对于不同水系片区来说, 其变化速度不同, 表明城市化过程对水系结构的干扰存在空间差异性。建议强力推进河流的蓝线规划和滨水区的开发管理, 将水网的保护和规划纳入到城市规划的管理范围; 注重在开发利用中的保护, 减少各类新建城市用地、农用地整理过程中对水系的破坏; 加大水土保持力度, 减少因水土流失导致河流淤塞; 加强管理, 严禁向河道中倾倒垃圾。 相似文献
10.
中国城市化过程中生态环境研究的文献计量分析 总被引:1,自引:0,他引:1
中国城市化过程中生态环境研究成果丰富,总结其演变过程利于把握该领域现状与趋势。本文从城市化文献视角对中国城市化过程中的生态环境研究在研究成果、研究子领域、研究主题、理论和方法等方面进行总结。结果表明,从2005年起中国城市化文献中关于生态环境的研究呈加速增长的态势;资源领域的国土资源和产业子领域,生态领域内经济子领域和环境领域内气候和城市环境子领域受到了较多的关注;"土地利用"和"热岛效应"一直是最热的关键词,分别占全部关键词出现频次的0.15%和0.09%,"热岛效应"和"气候变化"则是近期热点;主要理论涉及生态学、数理模型、资源与环境经济学、环境科学等,其中生态足迹理论从2002年起一直占据主流,STIRPAT模型、环境库兹涅茨曲线等综合理论模型是近期热点理论;依方法来源和主要应用领域将1992-2011年主要方法分为4类,即统计类(65.17%)、系统类(13.11%)、机理类(11.79%)和测评类(9.93%)。灰色系统分析和R/S分析近年来常见的方法。由此得出主要结论:中国城市化研究对城市土地利用、城市热岛、气候变化和水资源等大尺度的生态环境问题更加重视,对城市环境健康等微观尺度生态环境问题关注相对不足;以STIRPAT和多种土地利用变化模型为代表,综合自然和经济理论采用系统建模方法评价和模拟城市化过程中的生态环境效应将是未来研究的重点。 相似文献