The Integration and Sustainable Development of Chengdu-Chongqing Urban Agglomeration

Urban Agglomeration is an inevitable outcome of urbanization and industrialization, and a main form of urban development. Based on the analysis of urbanization and urban system situation, this paper will discuss the integration of urban agglomeration development, using the urban area of Cheng (Chengdu)-Yu (Chongqing) Urban agglomeration (CYUA) as a case study. By means of industries, population and spatial integrations, the function, strength and competition of CYUA will be improved and this urban agglomeration will transit from a budding state to a growing and mature one in future. The sustainable development of CYUA will depend on countermeasures, such as accelerating industrialization and urbanization, building a traffic network and express roads, strengthening the ability of self-sufficiency, enlarging the ecological construction and environmental protection, and establishing the synergetic institution of cross districts.

Impact of high-speed railway construction on spatial relationships in the Guanzhong Plain urban agglomeration

The Guanzhong Plain urban agglomeration is a response to the Belt and Road Initiative in Northwest China that aims to promote regional development.The direct impact of high-speed railway construction is to shorten the spatial-temporal distance among regions,improve the accessibility of regional transportation,and promote socioeconomic linkages.From the perspective of accessibility,this study analyzes the impact of high-speed railway construction on the spatial pattems and county-level economic relationships of the Guanzhong Plain urban agglom-eration.The results show that the construction of high-speed railway significantly improves regional accessibility,increases the potential for urban economic development,and gradually narrows the gaps in economic potential among cities.The construction of high-speed railway has increased the intensity of extenal economic relations among numerous counties in the Guanzhong Plain urban agglomeration,and most of the areas with increased connections are located in the direction of routes extension.The development of the internal economic network of the Guanzhong Plain urban agglomeration is unbalanced,and a complex network is gradually emerging with a few large cities at the core,but the construction of high-speed railway is changing the struicture of the economic network.In general,a certain degree of intrinsic coupling exists between regional accessibility change and the evolution of economic relations caused by high-speed railway,reflecting the requirements of the regional overall development strategy.

Spatio-temporal Evolution of Urban Expansion Based on a Novel Adjusted Index and GEE: A Case Study of Central Plains Urban Agglomeration, China

It is crucial to investigate the urban agglomerations spatio-temporal evolution patterns and driving factors for analyzing the urban spatial structure-functional division and promoting the coordinated development of urban agglomerations.In this study,a novel vegetation-building-nighttime light-adjusted index(VBNAI)was established for rapid and effective mapping of urban construction land(UCL)in Central Plains Urban Agglomeration(CPUA),China during 2000–2020 based on Google Earth Engine(GEE)platform.Compared with traditional indices,VBNAI can significantly decrease the blooming effect,Normalized Difference Vegetation Index(NDVI)saturation,and soil background of nighttime light data.In addition,the urban expansion indices and standard deviation ellipse model were synthetically adopted to analyze the spatio-temporal evolution pattern of urban expansion.The gravity model and the geographically weighted regression model were employed to determine the spatial interaction forces and drivers of urban expansion,respectively.The results showed that the VBNAI index has obvious advantages in efficiency and accuracy to extract UCL with the overall accuracy of more than 91%.The UCL of CPUA had increased by 4489.84 km2 during 2000–2020 with the gravity center moving towards southeast continuously.From 2000 to 2010,the urban expansion was in a‘center-hinterland’pattern which had benefit from the favorable effect of the traffic shaft belt.During 2010–2020,the urban network structure had basically established.Urban expansion had been influenced by a variety of socio-economic and demographic factors,and the impact degree varied from region to region.This study could provide scientific references for facilitating the intensive utilization of urban resources and optimizing the spatial development pattern of urban agglomeration.

Study on Rural Ecotourism Development in Yingshan Area of Chengyu Urban Agglomeration

Chengdu-Chongqing urban agglomeration covers a large number of rural areas.These areas have unique topographic conditions,diverse landscape types,and beautiful natural environment,but the economic conditions are underdeveloped;the ecological environment is fragile and the tourism carrying capacity is low.At the same time,they are facing the problems of lack of tourism facilities and low management level of scenic spots.Taking Yingshan area as an example,this paper evaluates the rural tourism development conditions from the aspects of location conditions,complementarity of tourism resources,highlights of tourism resources,tourist source conditions,and ecological environment,and makes a detailed plan for the functional zoning and tourism products of rural tourism development.The research shows that in order to realize the sustainable development of rural tourism resources,Chengdu Chongqing urban agglomeration should take the global tourism concept as the scientific guidance,ecological protection as the premise,agricultural resources as the basis,and culture as the soul,carry out rational,orderly,and scientific rural ecotourism development,and create high-quality rural ecotourism products.

Research on the Spatial Evolution of the Chengdu-Chongqing Urban Agglomeration: Based on Cross-Sectional Data from 2000 to 2015

Based on the cross-sectional data of 2000 and 2015, this paper quantitatively analyzes several indicators of the Chengdu-Chongqing Urban Agglomeration, including the permanent population, urban population, GDP, and total industrial output value, to explore the overall situation of the spatial development of urban agglomeration at this stage. The study finds that the permanent population and GDP maintain the trend of concentrating to higher-level cities, and the central cities of Chengdu and Chongqing have an obvious status of polarization. The main city of Chongqing is relatively dependent on industry, while the main city of Chengdu is driven by service economy and has a stronger capacity of urban population concentration. Different from the traditional understanding, Chongqing’s regional central cities have realized rapid industry-driven growth, and their development is faster than that of Sichuan’s prefecture-level cities. Despite of a large outflow of population, county-level units have achieved high growth rate of urban population, and the in-situ urbanization is obvious. The spatial pattern shows an 'eastward inclination,' in which the development of western Chongqing is the most outstanding, while that of Chengdu Plain and southern Sichuan region with a better basis has slowed down, and the originally backward areas, such as northeastern Chongqing, southeastern Chongqing, and eastern Sichuan, have a prominent development.

Spatial expansion effects on urban ecosystem services supply-demand mismatching in Guanzhong Plain Urban Agglomeration of China

Global urbanization has led to drastic land use change,interfering the ecosystem services(ES)supply-demand balance,in turn threatening the well-being of humans.However,existing studies mainly stranded at the historical and current analysis,and the effects of urban spatial expansion on the relationship between ES supply and demand in the future are less clear,in particular at an urban agglomeration scale.This study was constructed with a framework of assessing the effects of urban spatial expansion on ES supply-demand mismatching under different future scenarios in the Guanzhong Plain Urban Agglomeration(GPUA)by using the Future Land Use Simulation(FLUS)model and expert-based Land-Use and Land-Cover Change(LUCC)matrix.The results showed that:(1)Urban expansion is significant in the natural development(ND)scenario,mainly manifesting the great transfer of dry land to construction land.(2)The gap between total ES supply and demand is narrowed from 2000 to 2030 and the mismatch between ES supply and demand is mainly reflected in the spatial distribution pattern in the GPUA.The ES budgets were in high surplus in Northern Qinling Mountains and northeast mountain areas,while they were in severe deficit in urban center areas.The budgets deficit under the ND scenario in 2030 is the most severe.(3)The gradient differences of ES budgets of the GPUA between urban centers and suburbs increase from 2000 to 2030 under two scenarios.The deficit region expands largest under ND scenario.The findings revealed that ES declining and supply-demand mismatching were triggered by the drastic land-use change driven by rapid urban expansion.The expansion has brought about an increasing material demand and growing industries,threatening the sustainability of ecosystems.Scenarios setting could contribute to coordinating the relationship between future urban development and ecological protection,and the policy strategies proposed in the study could inform ecological management and urban planning in the regions facing the similar urbanization situation.

中原城市群文化软实力综合评价及空间分异研究

基于文化吸引力、文化展示力、文化传播力、文化创新力、文化事业投入力和文旅融合力6个维度构建文化软实力评价指标体系,运用空间分类、核密度分析、空间自相关等方法,分析中原城市群文化软实力的空间特征并解析其影响因素。结果表明:(1)从综合实力差异看,高、较高文化软实力城市数量少且主要分布在核心区,中等实力城市仅有3个,半数城市为低和较低实力。空间上具有明显的东西差异,西半壁呈现以郑汴为引领的中心外围格局,东半壁则表现为亳州、阜阳引领的极化特征,且在东西半壁之间形成聊城至驻马店的低值连绵带。(2)从分维度空间差异看,文化吸引力子系统、文化展示力子系统与综合实力格局类似,而文化事业投入力子系统呈现“西北高、东南低”的格局。此外,文化传播力子系统、文化创新力子系统呈现与前3个子系统完全不同的格局,表现为以郑汴为核心的低值包围高值的分布结构。(3)从空间集聚和关联看,中原城市群分别围绕郑州和亳州形成了“一主一副”的双核集聚态势,且主核区附近形成了显著的高-高集聚群。其中,文化吸引力子系统与综合实力的集聚格局基本一致,文化展示力子系统的集聚在郑州减弱而在亳州得到加强,文化传播力子系统和文化创新力子系统仅在中部形成集聚核心,文旅融合力子系统则在综合格局的基础上在东南部形成两个集聚核心。(4)从影响因素看,市区GDP对城市文化软实力的影响最强,第三产业增加值次之,交通设施、科教文卫单位数和城镇化率的影响作用不明显。

城乡空间高质量融合发展路径研究——以关中平原城市群为例

深入实施区域协调发展和新型城镇化战略是基于城乡社会发展实际,推动我国全面高质量发展的重要抓手。关中平原城市群作为我国西部地区经济社会发展的重要空间载体,其城镇空间、乡村空间和区域经济发展具有一定的地域特征和代表性。基于新时代背景,构建城乡空间高质量融合发展内涵和发展模式的理论框架。通过对关中平原城市群城乡发展核心问题研判,提出以“中心城镇拉动”“乡村崛起推动”等为代表的城乡融合发展动力机制,从优化城乡空间格局、构建城乡产业体系、推进城乡基础设施互通、统筹城乡公共服务共享、健全城乡要素流动保障等方面探索关中城市群适宜性发展路径,助推关中平原城市群城乡空间高质量融合发展。

高质量发展下关中平原城市群数字基础设施发展水平时空演化及其影响因素

实现数字基础设施均衡发展是高质量发展背景下关中平原城市群需要重点关注的问题之一。基于2012—2021年关中平原城市群11个城市的样本数据,采用标准差椭圆、空间马尔可夫链和灰色关联分析探究了数字基础设施发展水平的时空演化特征及其影响因素。研究发现:关中平原城市群的数字基础设施发展水平并不均衡,但各城市之间的差距呈现逐渐缩小的趋势;空间格局总体呈现出东北-西南方向向心集聚、西北-东南方向空间发散的态势,分布重心逐渐向东移动;同时,在不同邻域类型下,各城市数字基础设施发展水平维持稳定的概率要高于向上或向下转移的概率,难以实现跨水平发展;政府支持力和内源拉动力对关中平原城市群数字基础设施发展水平的时空演化具有显著影响。通过考察关中平原城市群数字基础设施发展水平的时空格局演化及其影响因素,希冀为其优化布局和协调发展提供决策参考。

关中平原城市群城市资源集聚能力演变及其影响因素

探究城市资源集聚能力的变化趋势与影响因素,对优化资源空间配置,促进城市群高质量发展有重要意义。论文构建评价模型评价城市资源集聚能力,揭示2003—2020年关中平原城市群内部城市资源集聚能力时空演变特征,并通过空间计量方法估计影响城市资源集聚能力演变的影响因素。研究发现关中平原城市群内部资源集聚呈现“首位”分布,西安的资源集聚能力最大但增长缓慢,而其他城市资源集聚能力总体不高且大部分降低。城市资源集聚能力的空间分布在缓慢集中,且存在正向空间依赖。经济发展水平、生态环境质量、科技发展水平、公共服务水平和工资水平显著提升了城市资源集聚能力,而市场化水平抑制了城市资源集聚能力。

基于GMD-GRA-TOPSIS的成渝城市群资源环境承载力评价

城镇化的快速发展给城市带来压力,导致资源短缺、环境污染等问题,制约城市的可持续发展,资源环境问题也是制约成渝城市群可持续发展的重要因素。该文基于DPSIRM模型构建评价指标体系,利用GMD-GRA-TOPSIS模型对2010-2020年成渝城市群资源环境承载力进行对比,再采用灰色预测模型对成渝城市群未来资源环境承载力进行预警。结果表明,2010-2020年,成渝城市群各市资源环境承载力趋势各异,在资源环境方面具有一定的承载能力;在地区分布上,相邻城市具有直接效应,地理上的接近,更容易受到彼此的影响,相隔城市具有间接效应,或受上层政策、区域发展规划等影响;在预警评价上,2025年成渝城市群资源环境承载力警情状况整体较稳定,且局部有改善趋势,为城市发展提供有效改进思路。

高质量发展视域下城市群空间网络联系与人口长期均衡发展——基于成渝城市群的实证分析

在人口规模巨大的背景下,促进人口长期均衡发展、深入实施区域协调发展是我国高质量发展的必由之路。采用2006—2020年16个城市的面板数据,使用耦合协调度模型和修正引力模型分别测度成渝城市群16个城市在2006—2020年间的空间网络联系度与人口长期均衡发展水平,运用空间杜宾模型实证分析城市群空间网络联系对人口长期均衡发展的影响及其时空异质性和网络外部效应,发现:(1)城市群空间网络联系可促进本地人口长期均衡发展,但将在周边形成“集聚阴影”,产生不利于周边城市人口长期均衡发展的网络负外部效应。(2)成渝城市群空间网络联系对成都市、重庆市双核心城市以及绵阳市、宜宾市和泸州市三个副中心城市的人口长期均衡发展水平产生促进作用。随着行政级别的提升,城市网络联系逐渐由不利于周边城市人口长期均衡发展的负外部效应转变为促进周边城市人口长期均衡发展的正外部效应。(3)城市空间网络联系所产生的外部效应呈现先负后正,最后趋于收敛的倒S型,且在0-100公里的范围内形成“集聚阴影”,150-200公里范围内为城市网络联系发挥正外部效应的最优半径。(4)科技创新和创业活跃度的提升是城市空间网络联系促进人口长期均衡发展的关键渠道。

成渝城市群“三生”用地空间演化及其生态环境效应研究

运用土地利用转移矩阵、生态环境质量指数、生态贡献率和冷热点分析等对成渝城市群1990—2020年“三生”用地空间变化及其生态环境效应进行分析。结果表明:(1)生产用地和生态用地面积减少,生活用地面积增加,各地类之间的转型以生产用地和生态用地相互转型为主,其次是生产用地和生活用地之间的转型,生态用地和生活用地的相互转型最少;(2)城市群整体生态环境质量呈缓慢下降趋势,分布具有中部凹陷、两边凸起的特征;(3)人地关系的改变导致成渝城市群各时段冷热点分布空间差异较大,2000年前后生态环境质量变化的冷点区面积大于热点区面积。因此,要加大耕地保护力度,稳定现有生态用地面积,提高土地利用效率,以实现生态和经济发展双赢。

城市群品牌体系评价与形象提升研究——以成渝双城经济圈为例

城市群作为区域经济发展的重要载体,加强其品牌形象塑造,将有助于打破行政区域划分的限制,在更高层次上实现城市品牌符号的竞争,增强城市群的吸引力、传播力、凝聚力和号召力,促进城市经济社会文化的高质量发展。在借鉴相关成熟指标和测量方法的基础上,建构由经济发展、创新能力、宜居水平、文化影响和品牌传播力等5个一级指标、13个二级指标和33个具体指标构成的城市群品牌评价体系,并对成渝双城经济圈内36个市(区县)进行测算。研究结论如下:城市经济越发达,其城市文化发展水平也越高,部分区县文化资源开发存在较大差距;除核心城市外,多数城市的品牌传播力指数较低,表明地方媒介的作用与效能没有得到充分发挥。在此基础上,重点从经济、创新、宜居和文化等四个方面,提出成渝双城经济圈城市群的整体品牌形象提升战略与整合传播策略。

突发公共卫生事件下成渝城市群智慧化治理

突发公共卫生事件因成因复杂、种类多样、影响广泛等特点给城市群治理建设带来挑战。为解决成渝地区双城经济圈缺少行之有效的突发公共卫生事件预警与应急机制、公共卫生安全应急信息管理存在疏漏、突发公共卫生事件应急管理纵向链条过长、城市群社区智治水平有待提升、城市交通体系应对突发公共卫生事件能力不足等问题,构建成渝地区双城经济圈应急管理联动指挥机制,实现突发公共卫生事件管理智慧化,构建成渝一体化智慧城市政务系统,提高智慧城市群社区智治水平,实现基于新技术的智慧化交通治理等,从而不断提升成渝地区双城经济圈应对突发公共卫生事件的能力。

城市群城市韧性水平测度及障碍因子识别

城市群是城市发展较高层次的空间组成形式,其城市韧性的提升对建设韧性城市、促进城市群持续健康发展具有重要意义。为全面测度城市群城市韧性水平并识别其障碍因子,构建了城市群城市韧性评价指标体系,采用熵值法和BP神经网络模型对关中平原城市群2011—2020年各城市分系统韧性和复合系统进行分析,进一步使用障碍度模型对影响关中平原城市群城市韧性的障碍因子进行识别。研究发现,关中平原城市群城市韧性位于中等韧性水平,但总体呈上升趋势,其空间分布格局呈现出“东西低,中间高”的倒V形。具体而言,经济系统韧性以较低韧性水平和中等韧性水平为主,社会系统韧性以中等韧性水平和较高韧性水平为主,生态系统韧性以较高韧性水平为主,而基础设施系统韧性则主要分布在较低至较高韧性水平之间;建成区绿化覆盖率和全社会用电量因子是影响关中平原城市群城市韧性提升的主要障碍因子;从分系统来看,社会系统始终是影响关中平原城市群城市韧性提升的关键系统。研究表明,城市群应进一步加强城市之间的合作,共享信息资源,提高人们生活水平,加大城市基础设施建设力度,不断促进城市群协调发展。

城市群协同立法的困境与出路——以中原城市群为例

城市群区域协同立法是推动区域高质量发展的重要力量。从实践来看,城市群协同立法存在现实困境,主要体现在立法引导缺失、资源利用效率低、缺乏有效的立法协调组织机构和核心城市辐射能力不足等方面。本文借助系统论理论,通过强调法治的引领和规范作用,构建法律与政策之间的协调机制,促进资源共享和交流合作,坚持民主立法原则并建立跨区域监管和执行机制等具体措施,以增强区域系统的意识,形成协同效应,从而促进城市群协同立法的更好发展。

西部城市群产业协同发展研究--以成渝和关中平原城市群为例

为探寻进一步推进西部城市群产业协同发展情况,并为制定差别化发展政策及策略提供依据,本研究将成渝城市群和关中平原城市群作为研究西部城市群产业协同发展的示范样本区域,通过构建复合系统协同度模型的方法,缕析二者产业协同发展现状及内在机理。研究结果表明:西部地区城市群产业协同发展尚处于低水平协同阶段,并存在宏观调控能力较差、城市群内部经济体量差距较大、中心城市辐射带动作用不足、城市群缺乏竞争力等问题,并提出打破行政壁垒、提升城市能级、培育副中心城市等宏观策略以及针对不同等级城市的优化建议,为实现区域产业协同发展、提升区域经济实力提供发展参考。

关中平原城市群土地利用变化对碳储量时空格局的影响

生态系统碳储量的变化与土地利用的格局关系紧密,研究碳储量的变化对实现“双碳”目标具有重要意义。关中平原城市群是西部地区第二大城市群,国家战略的实施影响着土地利用类型,进而影响碳储量的时空分布。本文通过集成InVEST模型与PLUS模型,解析2000—2020年关中平原城市群土地利用类型和碳储量的时空演化特征,预测在自然增长、生态保护和经济发展3种情景下,2030年关中平原城市群土地利用和碳储量的变化。结果表明:1)2000—2020年关中平原城市群主要土地利用类型为耕地和林地,草地向耕地和林地转换以及耕地向建设用地转换是研究区土地利用类型转换的主要方式。2)2030年关中平原城市群在3种情景下,耕地面积均呈减少趋势。在自然增长、经济发展情景下,林地和草地面积呈减少趋势,建设用地存在显著式外延扩张;在生态保护情景下,林地和草地面积呈上升趋势,建设用地面积略有下降。3)2000—2020年,导致碳储量降低的主要原因是林地和草地面积的萎缩,碳储量累计减少7.02×10^(6)t。4)2030年在自然增长和经济发展情景下,关中平原地区建设用地和耕地扩张明显,碳储量明显降低;生态保护情景下建设用地扩张面积相对较小,在中部和东北部地区碳储量并无明显减小现象,总体碳储量呈散落增加。研究结果可为关中平原城市群未来的城市规划、国土空间管理提供科学依据。未来关中平原城市群可在生态保护情景的基础上进一步发展,在保护生态的同时限制建设用地的扩张。

中原城市群经济高质量发展水平测度及其空间格局研究

为深入探究中原城市群经济高质量发展水平,利用熵值法及空间分析法对中原城市群2012—2022年经济高质量发展水平和空间格局进行研究。结果表明:中原城市群近11年经济高质量发展水平有所提升,但各个城市平均水平仍然较低;空间格局呈现以“郑州-洛阳-济源”为首的三核心格局,核心发展区与联动辐射区发展水平差距较大,且存在扩大趋势;发展水平呈弱发散状态,中心城市对周边地区的辐射带动水平较弱;发展水平局部聚集态势明显,“高值”主要分布在中西部,“低值”主要分布在东南部和西北部。