Spatio-temporal Evolution Characteristics and Driving Forces of Winter Urban Heat Island:A Case Study of Rapid Urbanization Area of Fuzhou City,China

Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly prominent.In order to promote urban sustainable development and improve the quality of human settlements,it is significant for exploring the evolution characteristics of urban thermal environment and analyzing its driving forces.Taking the Landsat series images as the basic data sources,the winter land surface temperature(LST)of the rapid urbanization area of Fuzhou City in China was quantitatively retrieved from 2001 to 2021.Combing comprehensively the standard deviation ellipse model,profile analysis and GeoDetector model,the spatio-temporal evolution characteristics and influencing factors of the winter urban thermal environment were systematically analyzed.The results showed that the winter LST presented an increasing trend in the study area during 2001–2021,and the winter LST of the central urban regions was significantly higher than the suburbs.There was a strong UHI effect from 2001 to 2021with an expansion trend from the central urban regions to the suburbs and coastal areas in space scale.The LST of green lands and wetlands are significantly lower than croplands,artificial surface and unvegetated lands.Vegetation and water bodies had a significant mitigation effect on UHI,especially in the micro-scale.The winter UHI had been jointly driven by the underlying surface and socio-economic factors in a nonlinear or two-factor interactive enhancement mode,and socio-economic factors had played a leading role.This research could provide data support and decision-making references for rationally planning urban layout and promoting sustainable urban development.

Change in Urban Wetlands and Their Cold Island Effects in Response to Rapid Urbanization

The cold-island effect of urban wetlands has received increasing attention in recent years due to its important role in the alleviation of urban heat islands.Hangzhou,a representative rapidly urbanizing city with rich wetlands in China,was selected as a case study for researching the changes that the urban wetlands have undergone and their impact on the urban thermal environment.Land surface temperature(LST) was acquired from the thermal infrared data of Landsat 5 Thematic Mapper(TM) images in 1990,1995,2000,2006,and 2010,using the single-channel method.The results are as follows:1) considering the changes in land use,the urban wetlands located to the west of Hangzhou have decreased significantly during 1990–2010 because of rapid urbanization.In the Xixi Wetland,the change in land use was relatively small and most of the water body and vegetation were preserved.However,to the east of the Xixi Wetland,large areas of water body and vegetation have been replaced by built-up land as a result of the urbanization process;2) considering the change in LST,it was found from land surface temperature retrieval that the changing spatial pattern of the thermal field was highly correlated with land use changes.Low temperature regions of the eastern Xixi Wetland were gradually eroded by high temperature regions,and the centroid of the heat island in East Xixi was found to be constantly shifting westward.In addition,the difference in LST between the Xixi Wetland and East Xixi has increased;3) considering the impact factors for this area,land use structure and patch shape were found to have a significant impact on LST,shown by the results of multiple linear stepwise regressions.Increasing the size of the wetlands in urban planning is considered to be the most effective measure in alleviating the urban heat island effect.Moreover,reducing the spatial complexity of landscape patches also contributes to the alleviation of the urban heat island effect.

Quantitative study on the urban fresh water consumption since Chinese rapid urbanization

The development of urbanization has a close relationship with fresh water resources, especially in the rapid urbanization period. By analyzing the course of the urhanization development and the experience of international urbanization development, the paper confirms the starting time of the rapid urbanization. Based on the ecotogical theory; urban fresh water consumption is composed of three types： the direct, the indirect and the induced water consumption. And the paper constructs calculation model of the indirect and the induced water consumption. Using the related statistics data, the paper makes an empirical research on the changes of the amount and structure of water consumption. Then it discusses the correlation between the water consumption and the amount of urban population, and the result shows that the amount of the water consumption arid the urban population have a remarkable correlation with the exception of the amount of the indirect water consumption, and the curves fake on quadratic functian form. Last, from the urban fimction point of view; the paper anatomizes the cause of the urban water consumption changes.

SUSTAINABLE URBAN-RURAL RELATION IN RAPID URBANIZATION AREAS——Case of Transformation of "Urban Village" in Guangzhou

Many studies have been made concerning the problems, characteristics, formation, transformation measures, etc. of urban village from sociology, urban planning and geography, etc., which have made insightful analysis. However, most of these studies started mainly from the standpoint of the city govemment, drumming for the land- scape-oriented urbanization, namely pulling-down the urban village and constructing the splendid residence or business buildings. The article maintains that the most important thing the city government should do is to pay much attention to the sustainable living of urban villagers, who would lose their main income source, namely, the collective dividend and the family housing rent. The single method of compensation has been proved to be harmful to the villagers＇ community, in which some young villagers relying on rent were no longer to do anything but stay at home. On the other hand, considering the floating population has become the main stream of renters in urban villages, the emergence of urban villages was inevitable and would continue to exist in a long time under the socio-economic transition in urban China and globalization. Based on the analysis above, the transformation of urban village should take more concerns on the housing demands of floating population besides compensation for local villagers. Meanwhile, it is necessary to avoid the “landscape-oriented urbanization” without the “peasant-to-citizen” transformation.

Research on the Measurement of Urban Sprawl with a Multi-Factor Indicator in the Context of Rapid Urbanization in China

This paper attempts to create a multi-factor urban sprawl indicator containing population, economy, land use, and infrastructure by using statistical data, and empirically measures the urban sprawl level of 69 cities in China between 2000 to 2014. It then analyzes the results from regional and periodic perspectives, and divides urban sprawl into four types as well as discusses their characteristics. The main conclusions are:(1) the multi-factor indicator is applicable to measure China’s current urban sprawl level;(2) urban sprawl of large and medium-sized cities is becoming serious, while this trend has been eased in recent years;(3) the urban sprawl level and trend of large and medium-sized cities obviously differ from each other in regional perspective;(4) different types of urban sprawl present different sprawl structural characteristics.

Butterfly taxonomic and functional diversity in the urban green spaces of Hefei city

Urbanization has profound impacts on ecological environments. Green spaces are a vital component of urban ecosystems and play a crucial role in maintaining ecological balance and enhancing sustainability. This study aimed to investigate the community composition characteristics of butterflies in urban green spaces within the context of rapid urbanization. Simultaneously, it explored the status and differences in butterfly taxonomic diversity, functional diversity, and functional traits among different types of urban green spaces, regions, and urban gradients to provide relevant insights for further improving urban green space quality and promoting biodiversity conservation. We conducted a year-long survey of 80 green spaces across different urban regions and ring roads within Hefei City, Anhui Province, with monthly sampling intervals over 187 transects. A total of 4822 butterflies, belonging to 5 families, 17 subfamilies, 40 genera, and 55 species were identified. The species richness, Shannon, Simpson, functional richness, and Rao's quadratic entropy indices of butterflies in urban park green spaces were all significantly higher than those in residential and street green spaces(P < 0.05). Differences in butterfly diversity and functional traits among different urban regions and ring roads were relatively minor, and small-sized, multivoltine, and long flying duration butterflies dominated urban green spaces. Overall, these spaces offer more favorable habitats for butterflies. However, some residential green spaces and street green spaces demonstrate potential for butterfly conservation.

Major Factors Affecting the Distribution of Anuran Communities in the Urban, Suburban and Rural Areas of Shanghai, China

There is a dearth of information on the effects of landscape and microhabitat variables on the distribution of anurans in areas of rapid urban development, in both tropical and subtropical regions. Therefore, we studied 24 Wetlands sites from the center of Shanghai city, China extending outward to rural areas. Sampling was performed from May through July 2014. Urbanization was categorized by the proportion of hard ground cover. Transect sampling and ＇calling＇ surveys were used to investigated the richness and density of anurans; microhabitat factors were recorded simultaneously. One-way analysis of variance and Kruskal-Wallis tests were conducted to analyze differences of total density, species richness and density of individual anuran species in the three urbanization levels; redundancy analysis was carried out on the relationship between anuran density and environmental variables. Species richness was lowest in the areas where the proportion of hard ground cover was 〉 80%, and the total density of anurans was highest in the areas where coverage of the hard ground cover was 〈 30%. We recorded five species belonging to four genera and four families and an individual anuran species that had varied representations in urban environments. Beijing gold-striped pond frogs （Pelophylax plancyi） and Zhoushan toads （Bufo gargarizans） appeared to be well adapted to the Shanghai metropolis. Large water environments and aquatic vegetation （floating-leaves and emergent vegetation） were indicators of the presence of Beijing gold-striped pond frogs. The density of black-spotted pond frog （Pelophylax nigromaculatus） was at the lowest density in the areas where hard ground coverage was 〉 80%, and tended to prefer larger bodies of water. Hong Kong rice-paddy frogs （Fejervarya multistriata） and ornamented pygmy frogs （Microhyla achatina） both suffered severely from cropland loss due to urban development. Bare land around breeding grounds was important for Hong Kong rice-paddy frogs, since it usually chooses mud coast caves for hibernation.

Urban flood control strategy based on new relationship of human and flood

China is one of the countries with the most serious flooding disasters.In China,above 70% of big cities,50% of population and 75% of industrial and agricultural output value are distributed in eastern coastal areas with serious flooding.Therefore,enhancement of theoretical study and experience summarization of urban flood control is of great theoretical and practical significance.As economy is developing rapidly,urban scale is expanding fast,and urban flood control stand is promoted.Urban flood control calls for new concept and methods.This paper makes a systematic summarization of concept evolution and advanced methods concerning urban flood control at home and abroad.The concept of urban flood control has transformed from simple flood control and drainage to coexistence with and use of flood.Flood control measures have transferred form emphasis upon engineering ones to priority to both engineering and non-engineering ones,with special attention to ecological flood control,such as making full use of ecological revetment,ecological realignment of a river,multi-objective management of urban flood detention region,turning flood into resources and utilization of wetlands.

Analyzing the spatial patterns and drivers of ecosystem services in rapidly urbanizing Taihu Lake Basin of China

Quantifying and mapping the distribution patterns of ecosystem services can help to ascertain which services should be protected and where investments should be directed to improve synergies and reduce trade- offs. Moreover, the indicators of urbanization that affect the provision of ecosystem services must be identified to determine which approach to adopt in formulating policies related to these services. This paper presents a case study that maps the distribution of mukiple ecosystem services and analyzes the ways in which they interact. The relationship between the supply of ecosystem services and the socio-economic development in the Taihu Lake Basin of eastern China is also revealed. Results show a significant negative relationship between crop production and tourism income （p 〈 0.005） and a positive relationship between crop production, nutrient retention, and carbon sequestration （p 〈 0.005）. The negative effects of the urbanization process on providing and regulating services are also identified through a comparison of the ecosystem services in large and small cities. Regression analysis was used to compare and elucidate the relative significance of the selected urbanization factors to ecosystem services. The results indicate that urbanization level is the most substantial factor inversely correlated with crop production （R2 = 0.414） and nutrient retention services （R2 = 0.572）. Population density is the most important factor that negatively affects carbon sequestration （R2 = 0.447）. The findings of this study suggest the potential relevance of ecosystem service dynamics to urbanization management and decision making.

CONVERSATION WITH THE ENGINEER: BEYOND GREEN BUILDINGS-ENTERING THE ECOLOGICAL AGE

Arup,the global design,engineering,and business consultancy,is the creative force behind many of the world’s most innovative and sustainable buildings and transport and civil engineering projects.Founded over 60 years ago,Arup has operated in China for more than three decades,and almost a quarter of their worldwide staff of 9,000 is based in Hong Kong and China.Arup was initially commissioned by the Shanghai Industrial Investment Corporation in 2006 to put forward concept proposals for a new sustainable city:Wanzhuang Eco-City,located in Hebei Province.Plans for the 80 sq km site are now being guided by a Development Strategy,the Preliminary Control Plan and Sus­tainability Design Guidelines.British engineer Peter Head has been a director at Arup since 2004 and is based in London.He is chairman of global planning and leads the company’s planning and integrated urbanism business,which includes development planning,economics and policy,integrated urbanism,transport and environmental consulting and sustainable devel­opment.In his early career,Peter worked at the forefront of steel bridge technology,and in 1998 he was awarded an OBE for his services to bridge engineering.He is also chairman of the Steel Construction Institute.Peter was appointed a Commissioner on the London Sustainable Development Commission in 2002,representing the construc­tion sector.There,he was a member of the group that drafted the Sustainable Development Framework for London,which led an initiative to create a voluntary code of practice for sustainable planning,design,and construction of London’s built environment.For the last decade or so,Peter has been dedicated to overthrowing the notion that urbanization is inevitably the fast track to environmental collapse.Specifically,he is fighting to ensure that a growing number of the world’s mega cities,and the associated mega projects,embrace sustainability principles from the out­set.From 2004 to 2008 he was project director for the Dongtan Eco-City project near Shanghai,a project that has recently stalled.Over the last five years,Peter Head has lectured all over the world on sustainable development and the transformation of cities.He gave the 2008-9 Brunel Lecture Series for the Institution of Civil Engineers,titled“Entering the Ecological Age,”which he presented in twenty countries.The Brunel Lecture looked,in detail,as to whether there is a model that would enable 9 billion people to live sustainably on Earth in 2050.It asked which poli­cies and investments would be needed to achieve this and whether it could be done without damaging the economy.In focusing on this ecological transition Peter developed retrofit scenarios for existing buildings.Steffen Lehmann met with Peter Head at the IGBC Conference in Singapore in October 2009(where they were both speakers)that discussed the world crises caused by climate change,food and water shortages,and resource con­straint problems.Steffen asked Peter what the planner’s and engineer’s role will be in the cities’transformation to sustainable urbanism.Particularly,how such urban concepts and technologies could be scaled to fit the world’s most populous country,China?Here are excerpts from their conversation.

LESSONS FROM EUROPE FOR CHINA?New Urban Sub-Centres for a Polycentric Network City

This paper compares two cases:It relates to the development of new urban sub-centres in China,and the relationship of these sub-centres to‘Network City’theory.As cities move towards more polycentric systems,the case of Potsdamer Platz Berlin,compared to Zhenru Sub-Centre in Shanghai,is discussed.Both are transport-oriented developments promoting mixed-use density and transport-oriented development.According to the documentation by Shanghai municipality,this new urban centre,which is currently in its planning phase,is supposed to become a‘sustainable sub-centre for a growing metropolis.’The author,who has intimate knowledge of the Berlin case,was asked to advice on the Chinese project,based on the Potsdamer Platz experience.After some hesitation,a series of careful recommen­dations were formulated for the design and development of the Zhenru Sub-Centre,knowing that it is rather difficult to translate from one case to the other.The conclusion includes five recommendations for the urban design of such sub-centres,to ensure a delivery of economical,social and environmental sustainable outcomes.

近30年来中国北方快速城镇化驱动下乡村聚落的变化规律

快速城镇化进程中乡村的系统性衰落已成为全球趋势,面向乡村聚落(RUS)的持续追踪对于量化乡村发展的不平衡、不充分至关重要.本研究提出一种高效的遥感制图模型,用于自动化生产1990~2020年京津冀地区的RUS逐年数据集,并进一步分析了其变化的时空规律。结果表明:(1)从基于位置和基于面积的双重对比验证了模型的有效性,其多年平均精度分别为85%和0.88.(2)过去30年间,京津冀地区的RUS总面积增长了约2561km²,但其平均单体规模在2005年后基本保持稳定(3)过去30年京津冀地区56.3%的县域,其RUS逐年变化类型为“凸增长"模式。总的来看,本研究提出了一种高效的遥感制图模型用以持续追踪RUS的时空变化规律,能够为乡村聚落体系提供更为精细化的时空信息。

Planning Policies Towards Shanghai's Rapid Urban Development

The central core of Shanghai is expanding rapidly. The industrial area in the outskirtsmapped out in the overall planning of 1959 has become part of the two wings of the cen-tral city in the overall planning of 1984. The satellite town of Minhang, together with Wuj-ing, Baoshan and the towns in the neighborhood, tends to be joined together with thecentral city. More than one thousand multi-storey residential buildings have been put upin the central city,60 percent of which are erected in the old distrlcts. This, again, turnsthe old districts into overpopulated areas. In order to control the population density ofthese old areas and to develop Pudong(on the east of Huangpu River). Shanghai will beexpanded to the eastern side of Huangpu River. The central city, thus, will become a beltof dense population with Huangpu River as its axis: and it will outgrow, in size and inpopulation, its limits set by the overall planning. In the next century, how will the structure of city planning change? How to readjustthe planning of regional functions. urban traffic systems and infrastructural facility sys-tems? How to control unsystematic development in the city and in the outskirts? How toremove some of the residents from the central city to Pudong? How to change HuangpuRiver into a city axis? The following article will hold a discussion on the above problems.

Evolution of coordination degree of eco-economic system and early-warning in the Yangtze River Delta

On the basis of Landsat TM data of the Yangtze River Delta （YRD） Economic Zone in 1991, 2001 and 2008, this article, taking 90 counties in this region as study units, built spatial data transformation models, ecosystem service value （ESV） and coordination degree of eco-economic system （CDES） models. With the aid of ArcGIS9.3, mass grid and vector data has been processed for spatial analyses. ESV and CDES indexes have demonstrated the relationship between economic development and eco-environment system and its evolu- tion characteristics in the researched areas. Furthermore, the indexes have also been used for functional zoning and pattern recognition. Some results can be shown as follows. Firstly, since 1991, land use in the YRD has greatly changed： urban land area has increased primar- ily from original paddy land, dry land, grassland, garden plot and other land. Secondly, the ESV model has proved the deterioration trend of the YRD ecological system from 1991 to 2001 and slower degradation trend during 2001-2008. Also, it is illustrated that land-use conversion from water area and paddy field to urban area and dry land could cause great damage to ecosystem stabilization. Thirdly, GDP in the central and southern parts of the YRD is higher than that in the northern part since 1991. GDP growth rate in the central part is higher than that in the northern part during 1991-2001. This growth rate in the central part is also higher than that in the southern and northern parts of the YRD from 2001 to 2008. Fourthly, the YRD could be categorized into 12 types of subregions in terms of CDES index. According to its spatial characteristic of CDES index value in the study area, eco-economic conflict area with low CDES value which is located in the central part is surrounded by eco-coordinated areas with high CDES values. This illustrates a core-periphery spatial structure exists in the YRD. During 1991-2001, the CDES value implied the convergent de- terioration trend of eco-economic system in the study area; while it gradually stepped into coexistence of divergent deterioration and coordination during 2001-2008. Finally, this paper analyzed five subregions in the YRD, including initially degrading zone, initially coordinative zone, continuously degrading zone, coordination-declined.zone and coordination-promoted zone, based on eco-economic coordination and evolution patterns. And these subregions can be recognized and categorized by spatial transformation model.

Spatiotemporal dynamics of the urban sprawl in a typical urban agglomeration： a case study on Southern Jiangsu, China （1983-2007）

China has experienced urbanization at an unprecedented rate over the past decades. Against this background, this paper demonstrates the multi-level spatiotemporal urban sprawl process from 1983 to 2007 on the perspective of urban agglomeration with a case study in Southern Jiangsu. Based on a combination of eight rounds of satellite images from 1983 to 2007, the presented results suggest the following three main findings： （1） At the prefecture-city level, the urban sprawl in Southern Jiangsu has presented significantly divergent growth patterns, with more than half of this vast growth occurring in the Suzhou prefecture-level city. （2） At the county level, clear spatial differentiations exist in the direction of the urban sprawl. The centroids of all county seats in the Suzhou and Wuxi prefecture-level cities have an eastward tendency （Shanghai oriented）, while those of the county seats in the Changzhou prefecture-level city tend to be westward （Nanjing oriented）. （3） At the township level, two convergent groups have gradually formed over time; namely, the low density urban zone in the western hilly land and the high density urban zone around the three central downtown areas. The urban areas close to urban cores tend to merge, showing a high-density convergent growth pattern, as do the western and southwestern townships in Southern Jiangsu, showing a low-density convergent growth pattern. All of these findings may be valuable for researchers and local authorities in providing reference for regional coordinated growth, environmental management, and urban planning decision-making.

Shennan Road and the modernization of Shenzhen architecture

Shenzhen exemplifies the rapid development of urban planning and construction in China.Over the last 40 years,many representative urban spaces and buildings have been built on Shennan Road,the city’s main eastewest thoroughfare,which has witnessed the formation of a multicenter structural layout and the miraculous expansion of the city.Many iconic buildings were designed by Hong Kong or foreign architects.The continuous development along Shennan Road not only symbolizes the fruits of the reform and opening up policies of Shenzhen and even China,but also reflects the modern architectural history in Shenzhen.This study uses historical research methods to review the changes in the urban fabric and the design trends,as seen in representative buildings along Shennan Road in different periods.In addition to the transition path of the city center,the unique role of streets and buildings in the development of the urban structure is analyzed,and other urban functions and symbolic meanings are identified.This work contributes to the history and theory of the modernization of contemporary Chinese architecture.