空间联系视角的沈阳市多中心城市结构研究

以沈阳市为研究案例,借鉴国际著名团队POLYNET的研究经验并加以改良,进行了空间联系视角的多中心城市结构的实证分析。分别从人口密度分布、就业-居住空间联系网络与企业空间组织网络三个维度来识别沈阳市的人口中心、就业中心与产业中心,综合分析这些"中心"得出四点结论:①城市核心区就业与居住中心构成十字交叉的内循环结构;②浑南新区次中心特征颇具雏形;③外围人口中心、就业中心与产业中心错位发展;④沈阳市呈现不均衡的多中心结构特征。     

Commuting Distances and Gender: A Spatial Urban Model

In any urban center the commuting distances are a function of the spatial structure of the center and of the characteristics of the commuters. In this paper theoretical relationships between commuting distances and distances of residences to city centers are derived for monocentric and polycentric cities. These relationships are then linked to the sociological determinants of commuting distances. An econometric model encompassing both spatial structure variables and social variables is constructed and estimated using data for sixteen urban centers. Gender differences are focused upon. The expansion method is used.     

交通拥堵治理的空间与基础设施政策综述

交通拥堵是制约国内外城市可持续发展的瓶颈问题之一,给城市经济、社会与环境带来诸多负面影响.本文聚焦城市交通拥堵的结构性因素,系统归纳和综述了引导可持续出行行为的空间政策(如城市空间结构和土地利用政策)与基础设施供应侧政策(如道路和公共交通基础设施投资政策),及其在交通拥堵治理上的理论探讨、学术争论焦点、实证分析及当前亟...     

EMPIRICAL POLYCENTRICITY: THE COMPLEX RELATIONSHIP BETWEEN EMPLOYMENT CENTERS

Our paper empirically demonstrates that employment subcenters in large urban areas have important economic relationships with each other, and not solely with the central business district (CBD). Using data from Houston, Texas, we estimate polycentric density functions and show that “total” gradients differ from gradients using only own‐center coefficients. We model asymmetry by showing density is very different for centers with overlapping areas of influence. We conclude that subcenters have important yet heterogeneous linkages to each other in addition to the CBD, and that therefore the polycentric city is more complex than simply having additional centers mimicking the CBD.     

Geography and development

Economic development and underdevelopment is one aspect of theuneven spatial distribution of economic activity. This paperreviews existing literature on geography and development, andargues that rigorous theoretical and empirical analysis is neededto increase understanding of the role of geography in developmentand to better design development policy. The analytical issuesare: why does economic activity cluster in centers of activity?How do new centers develop? And what are the consequences ofremoteness from existing centers? Empirical evidence comes bothfrom the international context and from studies of internaleconomic geography and urbanization.     

Polycentric Systems of Governance: A Theoretical Model for the Commons

Polycentricity is a fundamental concept in commons scholarship that connotes a complex form of governance with multiple centers of semiautonomous decision making. If the decision‐making centers take each other into account in competitive and cooperative relationships and have recourse to conflict resolution mechanisms, they may be regarded as a polycentric governance system. In the context of natural resource governance, commons scholars have ascribed a number of advantages to polycentric governance systems, most notably enhanced adaptive capacity, provision of good institutional fit for natural resource systems, and mitigation of risk on account of redundant governance actors and institutions. Despite the popularity of the concept, systematic development of polycentricity, including its posited advantages, is lacking in the commons literature. To build greater clarity and specificity around the concept, we develop a theoretical model of a polycentric governance system with a focus on the features necessary or conducive for achieving the functioning predicted by commons scholars. The model is comprised of attributes, which constitute the definitional elements, and enabling conditions, which specify additional institutional features for achieving functionality in the commons. The model we propose takes the concept a step further toward specificity without sacrificing the generality necessary for contextual application and further development.     

SOMETIMES CLOSE IS GOOD ENOUGH: THE VALUE OF NEARBY ENVIRONMENTAL AMENITIES*

ABSTRACT An extensive empirical literature exists, showing that variations in region‐specific amenities can account for persistent differences in real wages across regions. However, this literature has considered only amenities in the same location as the household. This paper argues that environmental amenities at some distance from but accessible to urban areas may lead to negative compensating wage differentials. We use a general equilibrium framework and data from the 1995 Current Population Survey to calculate implicit amenity prices based on measures of distance to environmental amenities. Our results suggest that amenities outside the metropolitan area do generate compensating wage differentials, as workers are willing to accept lower wages to live in accessible proximity to “nice” places. This implies that these places provide a positive externality to those communities that find them accessible. The estimated effects are quantitatively important, suggesting that these externalities should be taken into account in policy making.     

Equity and Efficiency in Public Facility Location

In designing a system of urban public service centers, planners should consider both equity and efficiency effects in selecting the size of each center and the spacing between centers. The paper establishes theoretical and operational concepts for evaluating equity and efficiency, as affected by size and spacing alternatives. No objective means exists for determining the relative importance of equity and efficiency, so the decision, ultimately, is subjective. However, theoretical, empirical and simulation evidence indicate that equity is more sensitive than efficiency to the selection of size and spacing, within a wide range of alternatives. This suggests that the equity criterion is important in the design of public service systems, and deserves more attention in the public facility location literature than it has received in the past.     

城市紧凑度对中国城市创新的影响

城市空间特征与创新的关系是创新地理的重要研究议题.论文构建了城市紧凑度与城市创新的理论分析框架,提出研究假设,并选取中国地级及以上城市作为研究空间单元,从密度、土地混合利用、街道连通性和交通通达性四个方面构建了城市紧凑度指数,对2010年中国城市紧凑度进行了评价,分析了中国城市紧凑度的空间分布特征,在此基础上,采用空间...     

Residential location,workplace location and car driving in four Norwegian cities

Based on a study in four Norwegian cities (Oslo, Stavanger/Sandnes, Bergen and Trondheim) differing in size and centre structure, this article illuminates how residential and workplace location, local-area density and transit accessibility influence different aspects of travel behaviour. We find strong effects of residential and workplace distance to the city centre on overall driving distances and commuting distances. We also find clear effects of local area densities around residences and workplaces on the choice of car as a travel mode, along with less pronounced effects of the distance from dwellings and workplaces to the city centre. In the cities with the best developed transit provision, we also see clear effects of transit accessibility at the residence on the propensity of choosing the car as travel mode. The results provide strong support of Norwegian national policies of urban densification as a planning strategy to curb the growth in urban motoring. However, although the influences of urban structure on travel show many similarities across the four cities, there are also important differences reflecting variations in centre structure (predominantly mono- or polycentric) and population size. The magnitude of the influences of various urban structural characteristics on travel behaviour are thus highly context-dependent.     

基于企业网络视角的城市网络研究进展与展望

随着生产分割程度的不断加深,企业网络空间增长已经成为城市网络生长发育的重要驱动力量。近30年来,基于企业网络视角的城市网络研究日益增多,在链接关系及时空过程、价值生产空间格局、外部经济及其空间差异、规划实践及治理模式四个方面取得了重要进展。本文在梳理城市网络发展脉络的基础上,从多维视角提出了基于企业网络视角的城市网络理论体系研究框架。总体来看,基于企业网络视角的城市网络研究还处于起步发展阶段。围绕完善理论体系建设,未来研究应着力在5个方面取得进展：城市网络分析技术方法的发展完善、城市网络多维度时空过程的综合比较研究、城市网络发育过程的微观机理解析、城市网络演化模式理论模型研制、城市网络的治理模式和政策框架研究。     

GRAPH MODELING OF THE EVOLUTION OF STRUCTURES OF TERRITORIAL-PRODUCTION COMPLEXES IN NEW PIONEERING AREAS

A graph model technique is used to analyze the pattern of urban places in the Bratsk–Ust'-Ilimsk complex on the middle Angara River in Siberia. The places, serving as vertices, are connected into tree-like structures on the basis of a data matrix that uses the founding dates of the places and the distances between them. The resulting pattern of location reveals a linear-nodal structure that is typical of areas in early stages of economic development, such as the Middle Angara district, with its large hydroelectric stations and energy-intensive industries like aluminum and woodpulp. The graph technique is suitable for analyzing patterns of location at various stages of development and to predict the future evolution of the structure of urban places.     

Elaboration of a settlement system: the New England village in the federal period

Contemporary New England villages arose as nineteenth-century central places. The emergence of these commercial places reflected not the creation of something new out of whole cloth but an elaboration of an existing settlement system, a legacy of the colonial period and a manifestation of long-standing cultural habit. Town centers, more or less equally spaced and comprised of little more than a meetinghouse and a tavern, served as foci for town activities, as auxiliary central places. Most of the considerable localized economic exchange that characterized the colonial period occurred at dispersed places. The emergence of true central places about colonial town centers in the federal period marked a shift in scale or a general and widespread development of extra-local exchange, division of labor, and provision of centrality—the ability of a place to provide goods and services beyond the needs of its residents. Central places became accretions of full-time nonfarmers, of storekeepers, artisans, and professional people. Moreover, these places were interlinked to form a system of central places and, although a sorting process took place, the system was both a material manifestation of contemporary economic experience and an elaboration of the colonial settlement system.     

On Covering Problems and the Central Facilities Location Problem

A number of variations of facilities location problems have appeared in the research literature in the past decade. Among these are problems involving the location of multiple new facilities in a discrete solution space, with the new facilities located relative to a set of existing facilities having known locations. In this paper a number of discrete solution space location problems are treated. Specifically, the covering problem and the central facilities location problem are shown to be related. The covering problem involves the location of the minimum number of new facilities among a finite number of sites such that all existing facilities (customers) are covered by at least one new facility. The central facilities location problem consists of the location of a given number of new facilities among a finite number of sites such that the sum of the weighted distances between existing facilities and new facilities is minimized. Computational experience in using the same heuristic solution procedure to solve both problems is provided and compared with other existing solution procedures.     

SITUATIONAL PLACES: RETHINKING GEOGRAPHIES OF INTERCULTURAL INTERACTION IN SUPER‐DIVERSE URBAN SPACE

Cities in general and public urban spaces in particular have re‐emerged as important places where strangers from different social and cultural backgrounds interact. The growing number of intercultural encounters assumed by contemporary urban studies calls for a theoretical examination of how these encounters are conducted. In this article we therefore critically examine the interplay between cultures, strangers, performances, encounters, and urban built environments. This means bringing together the theoretical ideas of super‐diversity, culture in world society, and situational places. The article argues that intercultural interactions between strangers in cities – and elsewhere – shape the cultural conditions of contemporary world society. First, super‐diversity is discussed as a cultural reality of world society. Drawing on empirical evidence from psychology, intercultural interactions between strangers are then demonstrated to be part of ritualized cultural negotiations. Finally, the notion of situational places is put forward as the conceptual nexus between these cultural encounters and the urban environment. This perspective allows the integration of bodily performances between strangers, spatial and situational context, and the resulting places of encounter.     

CREATIVE CLUSTERS IN BERLIN: ENTREPRENEURSHIP AND THE QUALITY OF PLACE IN PRENZLAUER BERG AND KREUZBERG

Urban creative clusters are currently a major focus of attention, as their prominent position in both local political and academic circles makes evident. Many authors stress the importance of spatial concentration for creative industries. However, only a few studies have focused on the individual entrepreneur. As a result, empirical evidence of the meaning of urban place as a site for social networks and a space for inspiration is still scarce. This is of some consequence as entrepreneurs provide a crucial link between creative activities and economic change and development. This study contributes to the existing literature by investigating how different creative entrepreneurs choose and evaluate their location. Using qualitative interviews with entrepreneurs in two creative clusters in the Berlin neighbourhoods Prenzlauer Berg and Kreuzberg, this article shows the significance of the look and feel of specific places and explains how and for whom local networks are important.     

New Globalism, New Urbanism: Gentrification as Global Urban Strategy

This paper uses several events in New York in the late 1990s to launch two central arguments about the changing relationship between neoliberal urbanism and so–called globalization. First, much as the neoliberal state becomes a consummate agent of—rather than a regulator of—the market, the new revanchist urbanism that replaces liberal urban policy in cities of the advanced capitalist world increasingly expresses the impulses of capitalist production rather than social reproduction. As globalization bespeaks a rescaling of the global, the scale of the urban is recast. The true global cities may be the rapidly growing metropolitan economies of Asia, Latin America, and (to a lesser extent) Africa, as much as the command centers of Europe, North America and Japan. Second, the process of gentrification, which initially emerged as a sporadic, quaint, and local anomaly in the housing markets of some command–center cities, is now thoroughly generalized as an urban strategy that takes over from liberal urban policy. No longer isolated or restricted to Europe, North America, or Oceania, the impulse behind gentrification is now generalized; its incidence is global, and it is densely connected into the circuits of global capital and cultural circulation. What connects these two arguments is the shift from an urban scale defined according to the conditions of social reproduction to one in which the investment of productive capital holds definitive precedence.     

Population density,crowding and human behaviour

The author reviews the existing literature on density and crowding from a geographical perspective, with a focus on the concerns of urban geographers. Several types of empirical studies are described and reviewed, and research on models of crowding is outlined     

TOWARDS A CONCEPTUAL FRAMEWORK OF PLACE ATTRACTIVENESS: A MIGRATION PERSPECTIVE

The attractiveness of places is currently gaining a high policy salience in policymakers' efforts to draw mobile capital. Yet, while there are a growing number of empirical studies considering the migration of people and the attractiveness of places, there is an acute lack of conceptual understanding of the phenomena that hamper discussions between researchers and policymakers. This article suggests a conceptual framework whereby place attractiveness can be better understood from a migration perspective. The empirical material for this article mainly draws upon interviews that were carried out with migrants who seem to have considered at least one alternative in their search for a suitable destination. The conceptual framework, which comprises the main result of the article, illustrates that needs, demands and preferences are central and empirically identifiable components for properly appreciating place attractiveness in a migration context. It is argued that the attractiveness of places increases with the successive fulfilment of these factors; but on the other hand, the more factors a migrant seeks to fulfil in his or her destination selection, the fewer the choice possibilities. The article moreover shows how a life-course perspective needs to be integrated in such analyses since not only do migrants' needs, demands and preferences depend upon their current life-course phase situation, their resources and constraints are also likely to correlate with the life-course. The conceptual framework can be used to ease understanding between researchers and policymakers in issues related to place attractiveness and the migration of relatively affluent migrants with choice opportunities.     

An Assessment of the Space-Time Differential Model for Aggregate Trip Behavior to Planned Suburban Shopping Centers

Aggregate trip behavior to planned suburban shopping centers is studied in terms of changes in trip distance and shopping time within a framework of trip frequency, center scale, and consumer mobility. Such changes are expressed by a second-order differential equation. The assumed shopping strategy is that consumers accelerate the shopping trip cycle by minimizing trip distances. This can be solved to provide theoretical norms to assess against an exploratory data set compiled from 2,810 surveys undertaken in 1980/82 and 1988/89 over a range of centers. The analysis shows a significant relationship between the gravity coefficient and trip frequency. The samples are tested for periodicity using Fourier analysis. The results show that “small” centers are more likely to exhibit periodic behavior. “Large” centers do not follow this hypothesis. Both the gravity coefficient and trip frequency are shown to be quadratic functions of center size. The nonlinearity may be introduced by the agglomeration of shopping opportunities at larger centers. A critical value for “small-” and “large-”center behavior is determined from the minimum points of these distributions. A second equation from classical diffusion analysis is tested for “large” center behavior, where consumers accelerate spatial choice through a time minimization strategy. The results suggest that this strategy occurs at the midrange specialty center during the afternoon of the pre-Christmas rush rather than at large regional centers. The empirical characteristics of the three types of trip behavior are summarized.