Understanding the Relationship Between Shrinking Cities and Land Prices:Spatial Pattern,Effectiveness,and Policy Implications

Urban shrinkage has emerged as a widespread phenomenon globally and has a significant impact on land,particularly in terms of land use and price.This study focuses on 2851 county-level cities in China in 2005–2018(excluding Hong Kong,Macao,Taiwan,and‘no data’areas in Qinhai-Tibet Plateau)as the fundamental units of analysis.By employing nighttime light(NTL)data to identify shrinking cities,the propensity score matching(PSM)model was used to quantitatively examine the impact of shrinking cities on land prices,and evaluate the magnitude of this influence.The findings demonstrate the following:1)there were 613 shrinking cities in China,with moderate shrinkage being the most prevalent and severe shrinkage being the least.2)Regional disparities are evident in the spatial distribution of shrinking cities,especially in areas with diverse terrain.3)The spatial pattern of land price exhibits a significant correlated to the economic and administrative levels.4)Shrinking cities significantly negatively impact on the overall land price(ATT=–0.1241,P<0.05).However,the extent of the effect varies significantly among different spatial regions.This study contributes novel insights into the investigation of land prices and shrinking cities,ultimately serving as a foundation for government efforts to promote the sustainable development of urban areas.

Impact of coupling coordination development of port and city environments on urban economic competitiveness:Evidence from the coastal port cities in eastern China

Promoting the coupling coordination development of port and its hinterland city environments is an important way to improve urban economic competitiveness.Based on relevant data of 13 coastal port cities in eastern China from 2000 to 2018,this study explores the coupling coordination development of port and city environments and its impact on urban economic competitiveness by constructing the coupling coordination degree model and the panel threshold model.The research results show that:(1)In terms of the coupling coordination development of port and city environments,most coastal ports and their hinterland cities are in a state of moderate or serious disorder.Overall,the degree of coupling coordination of port and city environments needs to be further improved;(2)The coupling coordination degree of port and city environments has a significant impact on urban economic competitiveness,and this effect gradually increases with the development of the ports and the urban economy.Among the variables that impact the urban economic competitiveness,fixed assets investment and foreign trade are significant factors that can enhance urban economic competitiveness.(3)At present,there is a“U-shaped”relationship between the coupling coordination degree of port-city environments and the urban economic competitiveness.This relationship lies on the right side of the inflection point of the“U-shaped”curve.Therefore,following the concept of assigning priority to ecological development,expanding fixed assets investment and actively developing foreign trade can further enhance the urban economic competitiveness.

Do companies influenced by smart cities pay more attention to green governance?Mechanism and optimal spatial correlation

Smart cities are a way for China to construct an innovative and environmentally conscious nation.The paper examines the impact of smart cities on corporate green governance and provides a theoretical foundation for formulating and executing smart city policy in China.Based on panel data from Chinese A-share listed companies in Shanghai and Shenzhen from 2008 to 2020,this study constructs a multiperiod double-difference model to examine the influence of smart cities on corporate green governance.Additionally,it uses a spatial double-difference model to investigate the spatial spillover effect of smart cities on neighboring areas.The findings indicate that smart cities effectively enhance corporate green governance.Analyzing the influencing mechanisms reveals that resource allocation efficiency,technological innovation,management environmental awareness,and regional environmental enforcement efforts act as mediators.Furthermore,the study reveals that the impact of smart cities on promoting corporate green governance is more pronounced in regions with lower levels of marketization and resource-based cities.Moreover,the research explores the spatial spillover effects of smart cities,with an effective radius of approximately 350 km.The optimal spatial correlation zone for green governance of businesses in neighboring areas in relation to smart cities is within a range of 250-350 km.This is manifested by the significant promotion of green governance in neighboring area businesses facilitated by smart cities.

Welfare effects of rural-urban land conversion on different aged land-lost farmers:exemplified in Wuhan city

Rural-urban land conversion is a universal phenomenon in the rapid process of economic development and urban growth.The welfare of farmers who lost their farmland attracted a widespread concern within the society and academia.However,further research about differentiated policies according to the characteristics of different farmer groups is still need to be conducted.This article divides the land-lost farmers into three age groups:younger than 45,45-65,and more than 65.It proposes a welfare index system including eight functional areas based on different age groups of affected farmers,taking four districts of Wuhan City as case study area.Fuzzy mathematics method is used to derive the aggregated welfare effect index.Our analysis show that the overall welfare levels of land-lost farmers of all age groups declined,but with a varying degree,with the level of welfare in those farmers who are 45-65 years old,younger than 45 years old,and older than 65 years old decreased by 18.7%,16.6%,and 12.7%,respectively.The direction and degree of effects on the functional activity index varies among different groups.Economic conditions,living environment,health,and social participation of all age groups decrease while social security and housing conditions increase.On the other hand,development opportunities,social communication,and leisure have different changing directions in different age stages.These results call for differentiated and tailor-made compensation policies for land-lost farmers,towards improving the welfare levels of all farmers and reduce the disparity among them.

Short-term Effects of Air Pollution on Mortality in a Heavily Polluted Chinese City

Since the London fog in 1952, numerous epidemioLogical studies have revealed that both short-term and long-term exposure to air pollutants is associated with the development of diseases[1]. Up to date, the assessment of air quality on health and air quality standard establishment in developing countries were mainly relied on extrapolation based on the results from long-term cohort studies conducted in Europe and North America.

Driving Effect of Theme Cultural Tourist Destination Attributes on Tourists' Place Attachment: A Case Study of Yancheng City in Changzhou

From the perspective of man–land relationship, Yancheng City(ruins of Yancheng in the Spring and Autumn Period) as a typical theme tourist destination is selected to construct the structural model of driving effect of tourist destination attributes on tourists' place attachment, and carry out the empirical research. The results show that attributes of Yancheng City contain 4 dimensions, and tourists' perception of the attributes declines in the sequence "recreational and entertainment attribute→ attribute of culture of the Spring and Autumn Period→ attribute of landscapes and ruins→ attribute of humanistic concern"; the four-dimension attributes vary greatly in driving tourists' place attachment, recreational and entertainment attribute and attribute of culture of the Spring and Autumn Period have obvious positive driving effect, attribute of landscapes and ruins and attribute of humanistic concern have poorer driving effect; generally speaking, driving effect of tourist destination attributes on tourists' place attachment is demonstrated as "highlighted value functions of tourist destination attributes→‘predominant area' of tourists' perceptual experience→ obvious driving effect on tourists' place attachment" and "hysteretic value functions of tourist destination attributes→‘vulnerable area' of tourists' perceptual experience→ weakened driving effect on tourists' place attachment"; driving effect of the overall attributes of tourist destination on tourists' place attachment is to be further improved and optimized.

Atmospheric Pollution Control Effect of Key Cities in Inner Mongolia in 2014

APEC conference was held in Beijing during November 3- 12,2014. Hohhot City and Baotou City fall into the peripheral key air pollution control cities in the ＂ Beijing- Tianjin- Hebei＂ region. Inner Mongolia government adopted powerful pollution control measures in the period of the conference. According to pollutant concentration data and meteorological data etc. in the course of the event and the same period of last year,the atmospheric pollution variations and control effect were discussed in this study. The results showed that during October 1- 25,2014,there were 16 days with air pollution in Hohhot City and 15 days with air pollution in Baotou City,respectively increasing by 8% and 34% compared with the same period of 2013,and the concentration of particulate matter was also higher than that of last year. During October 22- 24,2014,Hohhot and Baotou cities were polluted persistently. The variation features of hourly concentration of main pollutants PM（10） and PM2. 5were similar to those in the same period of 2013. That is,the pollutant concentration reached the maximum from 21：00 to 23：00,and the minimum appeared from 15： 00 to 19： 00 in the next day. In the course of the event,the concentration of particulate matter in the two cities stared to reduce greatly on October 26. From October 26 to November 13,there were no days with air pollution in Hohhot City,decreasing by 100% compared with the same period of 2013; there were five days with air pollution in Baotou City,and the numbers of days with slight,moderate and severe pollution reduced by 37%,100% and67% respectively compared with the same period of last year. The persistent air pollution from October 22 to the first 10 days of November was related to unfavorable meteorological conditions,and the meteorological condition in the same period of 2014 was even worse. In the course of the event,the Inner Mongolia Government adopted air pollution control measures around October 25 and began to adopt some powerful pollution control measures on November 1. As a result,air pollution in key cities has been controlled effectively. This event showed that urban atmospheric pollution problem can be resolved,and we should take an optimistic attitude towards this matter.

Clinical Effect of Qibai Landslide on Jellyfish Injuries in Qinhuangdao City

Objective.To investigate the clinical effects of phlegm and phlegm and magnesium sulfate combined with magnesium sulfate in sea lice in Qinhuangdao City.Methods.A total of 78 patients with sea lice in Qinhuangdao City from June to May 2018 were enrolled.They were randomly divided into control group(n=39 cases)and observation group(n=39 cases).The control group was treated with magnesium sulfate.The observation group was treated with Qibai Colshi Decoction on the basisof the control group.The effect of the patients was evaluated after 5 days of treatment.The disappearance time of symptoms,inflammatory factors and adverse drug reactions were compared.Results.After treatment,the onset,pain time,skin loss,swelling time and course of treatment were shorter in the observation group than in the control group(P<0.05).The levels of inflammatory factors were lower than those before treatment(P<5).The levels of TNF-a,IL-6,HIS and 5-HT in the observation group were lower than those in the control group(P<0.05).The rash,itching,drug allergy,liver and kidney were observed in the observation group and the control group.There was no significant difference in the incidence of dysfunction and blood pressure(P>0.05).Conclusion.The combination of magnesium sulfate and magnesium sulfate in the treatment of sea lice in Qinhuangdao City can shorten the disappearance of symptoms,reduce the level of inflammatory factors,and increase the incidence of adverse drug reactions.It is worthy of popularization and application.

Social Effect of Environmental Pollution on Valley-cities in Western China

Accompanied with the acceleration of urbanization and industrialization,the large and medium-scale valley-cities in the western China are facing environmental problems at respective levels in common. The urban environmental pollution causes economic losses,and also brings out negative effects on urban society. Based on the social investigation method,this paper aims to study the harms to urban society brought by environmental pollution. After the investigation to the inhabitants of six typical valley-cities:Lanzhou,Xining,Chongqing,Baiyin,Luzhou and Zigong,we found that the urban environmental pollution has resulted in negative influences with different levels on residents' physical,psychological,work,recreations,studies and social activities. The problem of environmental pollution has become a serious restriction to sustainable development of cities mentioned above. Herewith,it has become urgent to strengthen the government regulations for controlling urban environmental pollution.

Environmental Effects of Foreign Trade and Its Spatial Variations in Mid-eastern Provinces and Cities of China

The studies on environmental effects of foreign trade and its spatial variations are helpful to design and implement environmental protection countermeasures.In order to eliminate the adverse effects of insufficient observation values on the accuracy of regression results and dynamic information quantity of fitting equation during empirical study,panel data of the mid-eastern provinces and cities of China from 1985 to 2007 were selected based on the adjustment of classical regression model in this paper.Panel unit root test and panel cointegration analysis method were applied to investigating the environmental effects of foreign trade and its spatial variations in the mid-eastern provinces and cities of China and its three groups divided by foreign trade dependence.The results show that all scale effects are positive,while all technical effects are negative and unable to counteract positive scale effects.Foreign trade development is regarded as an important cause for outstanding eco-environmental problems in the mid-eastern provinces and cities of China.Total effects and structural effects are significantly different among different groups because of spatial variations in environmental policies,export destinations,source of FDI,etc.Following the principle of′coordinating generality and considering differences comprehensively′,it is essential to issue a series of policies and countermeasures corresponding to differences in regional environmental effect of foreign trade,in order to coordinate the relationship between foreign trade development and eco-environment in each region.

数字经济与绿色物流的协同发展研究——以智慧城市试点城市为例

文章选取108个智慧城市试点城市2017-2021年面板数据,采用耦合协调模型,对试点城市中数字经济与绿色物流的协同程度进行评价。在此基础上,通过固定效应模型,检验试点城市中数字经济与绿色物流协同关系的影响因素。研究发现:108个智慧城市试点中,华北、华东地区中的试点城市耦合协调度相对较高,西北、东北地区中的试点城市耦合协调度相对较低,不同等级城市之间的耦合协调度存在梯度差异。经济发展水平、信息化水平以及技术行业人力资本对耦合协调关系存在显著相关关系,产业结构与环境建设对耦合协调发展均没有显著影响。

雄安新区产城融合发展的创新路径

当前产业发展和城市建设基础较弱、定位于国家“千年大计”的雄安新区,其产城融合发展面临着城市高标准开发的自我造血机能较弱、产业跨越式发展的要素支撑较少、有为政府和有效市场的动态平衡较难等追赶和示范需同时进行等挑战。在未来产业发展服务化、城市发展多样化、产城发展协同化、产城创新数字化的趋向下,应以创新利用雄安“金字”招牌为首要、以充分发挥市场运行逻辑为支撑、以加快形成示范效应为突破、以渐进式产业发展为路径、以有效协调周边区域利益为促进,加快雄安新区产城融合发展,更好推进京津冀协同发展日益深入和多赢。

高铁开通与边缘城市金融要素发展:极化还是涓滴效应

高铁开通对金融要素在核心城市和边缘城市流动的影响一直存在争议。本文采用区位熵、城市的金融规模和人口流动等因素区分金融要素集中的核心城市和相对不集中的边缘城市,并使用双重差分(DID)法进行实证检验。结果显示,高铁开通使边缘城市与核心城市的金融要素发展差距扩大,极化效应凸显,这一现象在不同区域间存在异质性,且距离愈远极化效应表现愈显著。伴随极化效应,区域内金融要素高度集中,金融要素市场潜力下降。研究结论为高铁开通下边缘城市扮演的金融要素角色提供了经验证据。

环境政策与知识产权政策协同对绿色金融发展的影响研究

基于反事实思维,以2006~2019年中国192个城市为样本,运用回归控制法(HCW),实证检验低碳试点城市和知识产权示范城市政策协同对绿色金融的驱动效应,并重点分析政策协同影响绿色金融发展过程中绿色专利信号的传导机制。研究发现:政策协同能够给城市绿色金融发展带来显著正向冲击效应,且这一结论具有较强稳健性;无论是数量维度还是质量维度,政策协同均能在一定程度上强化绿色专利信号,尤其在强化高质量绿色专利信号方面较为突出;仅当绿色专利申请具备一定质量水平时,才能在低碳试点城市与知识产权示范城市政策协同影响绿色金融发展过程中发挥有效的专利信号中介效应。

考虑建筑群-沉积盆地动力相互作用的建筑群震害评估方法

我国大量城镇位于沉积盆地,沉积盆地对地震动具有显著的幅值放大和持时增长效应,同时沉积盆地与建筑群间的动力相互作用将导致地震动空间重分布。针对此问题,本文提出了一种考虑建筑群-沉积盆地动力相互作用的建筑群震害评估方法:首先,以剪切层模型、弯剪耦合模型等简化力学模型模拟建筑结构,计算建筑群-沉积盆地动力相互作用,获得建筑群的基础顶面地震动;然后,基于精细化有限元模型分析典型单体建筑的地震易损性;最后,结合所求建筑群元模型模拟建筑结构时,上部建筑对基础顶面地震动的影响具有等?效?性,因此所建方法适用于考虑建筑群-沉积盆地动力相互作用的建筑群震害评估;建筑群-沉积盆地动力相互作用主要导致盆地内地表地震动峰值降低,但局部位置会在盆地效应基础上产生附加放大效应;建筑群-沉积盆地动力相互作用导致不同地表点地震动加速度反应谱峰值相差3倍,同时放大邻近建筑出现相同等级震害的概率差异,所分析算例中,在是否考虑建筑群-沉积盆地动力相互作用的情况下,邻近四栋相同框架结构发生中等损坏的概率范围分别为66%—92%和87%—93%,此结果与实际震害中建筑结构交替破坏的现象一致。

超大规模城市粮食安全保障和有效供给——基于更高水平“天府粮仓”建设的思考

【目的】天府粮仓的建设对于超大规模城市及其周围城市群的粮食安全保障具有重要意义,旨在探索该背景下超大规模城市粮食安全保障和有效供给路径。【方法】系统总结超大规模城市粮食安全形势和特点,识别特定风险并提出系统解决方案。【结果】保障成都超大规模城市粮食安全需要提升粮食附加值保量,强化质量安全的政策引导,建立粮食安全预警—响应—处置体系,建立多元化、社区化粮食储备体系。【结论】超大规模城市的粮食安全保障不仅要关注平时的市场调控和法律政策支撑,更要重视应急情况下的供应保障与效率提升,同时注重区域协调与辐射效应,以实现区域粮食安全的系统性治理。

重庆示范性海绵型住区海绵系统长期水文-成本综合绩效优化

【目的】中国海绵城市建设已逐步进入优化营建与科学评估阶段。针对已建成海绵型住区,对于海绵系统的长期水文-成本综合绩效的研究较为欠缺。通过对长期水文、成本的量化评估,探讨亚热带季风性湿润气候地区中住区的海绵系统设计方式。【方法】以重庆示范性海绵型住区为研究对象,构建现状水文模型,通过监测数据进行精准校验。以低成本为目标,采用雨水桶及少量生物滞留设施和渗透塘,设定比选方案S1;以高水文绩效为目标,采用生物滞留设施、雨水桶、渗渠、渗透塘、轻薄绿色屋顶等类型丰富的设施,设定比选方案S2。在校验模型基础上构建出比选方案的水文模型,量化评估各方案长期的水文绩效、成本投入及水文-成本综合绩效。【结果】现状方案的年径流总量控制率为75.3%,略低于规划控制目标,且海绵系统建造维护成本相对最高。S1的平均年径流总量控制率为87.2%,其海绵系统的总投入成本最低。S2的平均年径流总量控制率和峰值削减率最优,其长期水文-成本综合绩效相对现状方案提升3.6倍。其中,透水铺装和蓄水池的水文-成本综合绩效最低,雨水桶与渗渠组合的综合绩效最高。【结论】提出在不同应用条件下,住区适宜采用的不同海绵系统设计方式。当住区绿地率条件良好,对水文-成本综合绩效要求较高时,宜采用具有丰富设施类型的S2。对重庆以及有相似降雨条件的亚热带季风性湿润气候地区中海绵型住区的建设优化有积极参考价值。

皖江城市带近20年土地利用变化及其生态环境效应

分析区域土地利用变化及其对生态环境的影响,能为区域土地利用结构优化及生态环境保护提供理论依据.以皖江城市带为例,基于2000年、2010年、2020年土地利用数据集,运用土地利用转移矩阵模型,分析了该地区土地利用时空变化特征;同时结合生态环境质量指数、网格单元分析方法及土地利用转型的生态贡献率,探究了土地利用变化的生态环境效应.结果表明:(1)皖江城市带土地利用转移主要为耕地和森林之间的相互转移,以及人造地表对耕地的侵占;(2)皖江城市带森林的生态价值重要性最大,最高达到55.29%,人造地表用地的变动对该区域的生态影响较大,生态价值贡献率为28.20%;(3)皖江城市带生态环境质量指数稳定且有下降趋势,区域生态环境质量指数呈现“南高北低”的空间格局;(4)耕地向森林及草地的转换是导致生态环境改善的主要原因,森林转向耕地及耕地转向人造地表是导致生态环境恶化的主要原因.