首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 31 毫秒
1.
Currently, in many countries most workers are covered by a national social security benefits program that applies equally in all parts of the country. In China, however, social security old-age benefits are provided in a highly fragmented manner. This article documents the high degree of fragmentation. It discusses both why that has occurred and the effects of the fragmentation on participants. It examines effects of the fragmentation on benefit levels, focusing on variations in the generosity of benefit formulas but also considering other measures of benefit adequacy. Fragmentation is seen to cause differences in benefit levels even within a single city. While the new National Rural Pension Scheme is a major improvement in the provision of retirement security for rural workers, important differences still exist in the social security programs for urban and rural workers.  相似文献   

2.
Mediterranean-type ecosystems are one of the most affected environments by habitat loss and fragmentation due to urban development, however only few studies have evaluated the effects of urbanization on the biodiversity of remnant fragments in these ecosystems. This study aims to evaluate the effects of urban development over small mammal assemblages inhabiting isolated forest fragments of an urban area of Chilean Mediterranean zone. We compared abundance and richness of small mammal assemblages of six remnant fragments within an urban matrix, and six fragments similar in area and habitat characteristics with those of urban area, but surrounded by a rural matrix. We found that small mammal assemblages differ considerably among fragments types (urban vs rural), with lack of endemic species from urban fragments and with high proportion of introduced rodents in urban fragments. Furthermore abundance of small mammals was higher in rural than in urban fragments. In urban areas small mammal abundance and richness were not correlated with any of the explanatory variables assessed (woody cover, flora heterogeneity, fragment area, perimeter/area ratio). However in rural fragments small mammal richness was negatively correlated with flora heterogeneity and the abundance of small mammals was positively correlated with perimeter/area ratio. These results reveal important differences within the effects of fragmentation over small mammal assemblages among the two types of fragments assessed. Our findings suggest that in forest fragments isolated by urbanization, larger areas with good quality habitats are not sufficient to maintain native small mammal population.  相似文献   

3.

Urbanization is a major cause of biodiversity loss and disconnection between people and nature. For this reason, the creation and maintenance of green areas as part of the urban landscape is a common practice in cities around the world. These green areas are generally a result of particular public policies regarding how these areas can be accessed, maintained, and how they are connected to other natural fragments in the city. In an effort to investigate aspects of the ecology of such green areas of the city of Curitiba, southern Brazil, the present study measured distinct parameters of the structure of butterfly assemblages from 19 forest fragments of distinct classes of protection, testing the influence of different policies (protection category) on butterfly assemblages. Comparatively, we also tested the predictive power of landscape variables (at distinct scales) and fragment quality (e.g. diameter at breast height, density of vegetation) using Generalized Linear Models (GLMs). Overall, 14,596 individuals belonging to 412 butterfly species were recorded, but values of species diversity and composition are very heterogeneous, indicating that the protection categories do not significantly interfere with the structure of the butterfly assemblages. More important than the protection category is the forest fragment quality and landscape connectivity. Our models showed that degraded fragments tend to present a specific butterfly composition, whereas the more urbanized landscape have poor butterfly species richness. These results reinforce the importance of implementing public policies that prioritize the conservation of the quality of forest fragments in every class of protection, as well as the conservation of forest fragments throughout the urban landscape.

  相似文献   

4.
The influence of environmental parameters on epigeic beetle communities of forest fragments in an urbanization gradient was studied in Berlin. Eight deciduous forests along a rural to urban gradient were sampled with pitfall traps. Species richness did not decline across the rural to urban gradient. As expected, impervious surface cover as an indicator of urbanization correlated not only with habitat fragmentation and heat island effect but also with altered soil properties. The proportion of forest specialist staphylinid species decreased with increasing urbanization. The differences between staphylinid communities of neighboring forest fragments were enhanced in the most urban parts, probably due to increased habitat fragmentation. Furthermore, the loss of flightless species with increasing habitat isolation emphasized the influence of habitat fragmentation. The carabid communities revealed the urbanization effects not as clearly as the staphylinid communities, but both taxa revealed that direct anthropogenic habitat alteration, indicated by removal of decaying wood, favors open-habitat specialists. The extent of the urbanization influence seems to vary seasonally. Environmental parameters associated with urbanization explain the ordination of species communities in the winter better than in the summer. Heat island effect is suggested as an explanation for this difference.  相似文献   

5.
李燕 《城市观察》2014,(4):166-175
在世界同质化加剧的今天,地方的独特性和差异性成为城市提升吸引力的重要手段。从地方的视角体察城市的演进和变化,进而构建"想象的地方",或者可以成为地方参与城市规划与建设的一种方式。不过,地方本身是一个复杂的概念。地方根著于历史,但地方又是一个"未完成的过程",因而地方处于流变之中。根据地方的社会建构理论,广州的作为地方的独特性和差异性首先可以集中表现为由千年古港的经济活动所建构的商贸文化传统。以千年古港和商贸之都为核心,构建"想象的地方",就是将这种商贸文化传统融入多种表现形式的城市叙事,通过地方记忆的再现,获得地方认同。  相似文献   

6.
The right to the city is a concept that helps rethink spatial–social dynamics, which has recently reinvigorated the field of organization studies. Following Lefebvre and considering the failure of both the market and the state, other scholars pinpoint the need to rethink social–spatial and geographical–historical relations. They do so by theorizing the city as a host for urban commons. Collective and non-commodified, these spatial–social experiences need to be constantly reproduced and preserved through commoning practices in the struggle against spatial injustice. A case study shows that a civil society organization (CSO) uses participatory art to (re)produce urban commons at the level of a local community and to redress partially spatial injustice. We theorize participatory art-making as a social practice of commoning, i.e., a process of organizing for the commons—collective art-based activities to serve a community—and of the common—to (re)produce a community while performing them. Such commoning practices are not only about sharing urban resources but also about using and experiencing differently urban spaces. By making participatory artworks in public spaces and co-designing street furniture with residents of poor areas, TDA helps to better cope with the tensions between residents and local authorities and between amateurs and professional artists. By negotiating the long-term implementation of these creative artworks in the public space with public authorities, TDA has fostered the empowerment of inhabitants as they have experienced citizens’ reappropriation of some public spaces in Marseille.  相似文献   

7.
In this article, I concentrate on a macro‐level analysis of inter‐urban linkages in a ‘world city network’. Empirical research on the formation of a world city network has mostly concentrated on global service providers. Yet, globally operating manufacturing firms also choose distinct urban regions throughout the world as locational anchoring points. In this article, using social network analysis, I present the first global‐scale analysis of how manufacturing firms connected cities across the world (in 2010). To detect the differing ‘sectoral profiles’ and nodal centralities of cities functioning as geographical hubs of transnational production networks, it is necessary to analyse the network structure of distinct industrial subsectors within the global urban system. The data collected for analysis cover 120 top global firms from three manufacturing subsectors, of which two are analysed in more detail than the third. I then compare the nodal centralities of cities included in these subsectors' global networks with the GaWC research on the producer services sector that has been at the centre of previous analyses of the world city network. The comparison reveals the cities' differing positioning within ‘multiple globalizations’. The aim of the article is to extend research on world city networks.  相似文献   

8.
We analyzed how urbanization in a desert ecosystem affects avian distribution at two distinct scales. At the regional level, we compared how urban land use configuration, relative to its surrounding agricultural fields and desert, affected the distribution of native and exotic species. While exotic species are isolated to the city; native species actively utilize the entire region, even occurring at higher densities in the city than in some areas of the desert. We also used this approach to compare four foraging guilds of birds: granivores, nectivores, omnivores, and insectivores. Granivores occurred mostly in agricultural fields and in the surrounding urban areas. Nectivores and omnivores occurred throughout the region, but mostly within the city. In contrast, insectivores occurred mostly in the desert. At a more local scale, we tested how the abundance of native species, exotics species and the foraging guilds of birds responded to vegetation cover measured at varying spatial scales (0.1 km–10 km). Bird guilds responded to vegetation at different scales, depending on the association between their life history and vegetation. Granivore abundance was most strongly correlated with vegetation at relatively fine spatial scales, followed by nectivores and omnivores at larger scales; whereas insectivores did not correlate with vegetation at any scale. Exotic and native species showed strikingly opposite trends in their association with vegetation. Native species showed the best fit at the smallest spatial scale and became insignificant at larger scales, whereas the highest correlation of exotic species with vegetation was at moderate to larger scales. While guild relationship with vegetation appears straightforward, the differences between exotic and native birds may indicate a complex response to environmental factors. Possibly, native species are more sensitive than exotics on vegetation abundance for food and shelter, which in the desert is highly variable depending on water availability. In contrast, exotic species, tightly connected to the urban infrastructure, likely respond to the enhanced and homogenized resource abundance characteristic of desert cities. Our results suggest that relationships between birds and vegetation may bear important information that can be revealed when considering smaller class levels than total species diversity.  相似文献   

9.
This paper re-examines the question of the social “fabric” of urban neighborhoods on the basis of residents' personal networks. Data were collected on the number, relative intimacy, and spatial distribution of social relationships among residents of two ethnically homogenous and two ethnically heterogenous neighborhoods in a medium-sized city in the midwestern United States. The analysis focused on spatial distributions and variables associated with differences in the average number or intimacy of neighborhood network ties. Herbert Gans had predicted that in heterogenous neighborhoods residential proximity would be a less important factor in social network formation than has previously been reported for socially homogeneous residential settings (especially Festinger et al. 1950). The results from this study indicated that the effects of proximity were more, rather than less, reflected in the spatial distribution of social relationships in the ethnically heterogenous neighborhoods. The face-block was identified as an important socio-spatial unit in all four neighborhoods.  相似文献   

10.
The rural‐urban political divide has sparked media and social science concern. Yet national studies of rural and urban voters have largely failed to draw from the distinct conceptual literatures produced by rural sociologists. We take a new look at individuals’ voting choices, building from two rural sociological literatures, research on spatial inequality and on the rural‐urban continuum, to identify the social bases anteceding Republican voting in presidential elections. We analyze three social bases along which rural‐urban populations vary: social structural statuses, work and employment, and sociocultural values and beliefs. We question the degree to which rural‐urban differences can be accounted for by these factors. Data are from approximately 9,000 respondents to the General Social Surveys for election years 2000–2012. Our findings demonstrate that the literatures produced by rural sociologists provide a strong conceptual foundation for explaining rural‐urban voting differences. Rural and urban residents’ differential social statuses account for the greatest variation in their voting choices. Sociocultural values and beliefs, particularly attitudes toward domestic social issues, are also important. Findings add significant insight into the variety of factors that differentiate rural‐urban individuals’ voting choices as well as illuminate the need for greater emphasis on exurban voters.  相似文献   

11.
This article explores how children conceptualise and practice family relationships in two social settings in Ethiopia. Based on ethnographic data, it discusses (i) how urban and rural children construct family; (ii) what family activities children do and which social positions they assume; and (iii) the convergence and divergence of meanings and practices of family relationships between urban and rural Ethiopia. The analysis demonstrates how ‘normative family’ and actual ‘family practices’ are shaped by socio‐cultural, material and spatial contexts. Insights drawn also reveal the complex ways in which access to material resources, geographical distance, rural‐urban locations and cultural traits such as patterns of marriage and child relocation practices shape family relationships.  相似文献   

12.
Abstract Coleman's (1988) theory of family social capital provides a conceptual framework for assessing the relationship between several dimensions of family structure and school dropout rates among nonmetro-politan youth. This paper evaluates the extent to which higher rural than urban dropout rates are attributable to spatial differences in family structure (e.g., living arrangements, family size, and early childbearing) or economic resources (e.g., poverty) and estimates the differential effects of family structure and poverty on school dropout rates in nonmetropolitan areas, suburbs, and central cities. Data are drawn from the March 1990 Current Population Survey. Results indicate that residential differences in family structure account for a relatively small part of the higher dropout rates found in rural areas. Rural youth's experience with poverty appears to matter more. The educational effects of family structure are nevertheless strong in rural areas, albeit somewhat smaller than in suburban areas, owing perhaps to compensating forms of social capital found in rural areas. The results suggest that studies of dropout behavior—in rural or urban areas—must acknowledge the potentially large role of family structure and economic resources on the educational achievement process.  相似文献   

13.
It is often assumed that in the historical transformation to modern industrial society, the integration of women into the economy occurred everywhere as a three‐phase process: in pre‐modern societies, the extensive integration of women into societal production; then, their wide exclusion with the shift to industrial society; and finally, their re‐integration into paid work during the further course of modernization. Results from the author's own international comparative study of the historical development of the family and the economic integration of women have shown that this was decidedly not the case even for western Europe. Hence the question arises: why is there such historical variation in the development and importance of the housewife model of the male breadwinner family? In the article, an explanation is presented. It is argued that the historical development of the urban bourgeoisie was especially significant for the historical destiny of this cultural model: the social and political strength of the urban bourgeoisie had central societal importance in the imposition of the housewife model of the male breadwinner family as the dominant family form in a given society. In this, it is necessary to distinguish between the imposition of the breadwinner marriage at the cultural level on the one hand, and at the level of social practice in the family on the other.  相似文献   

14.
Coming out and coming back: Rural gay migration and the city   总被引:1,自引:0,他引:1  
This research focuses on the complex meaning and role of the city in American and French rural gay men’s imaginary and life experience. It explores how gay men who grew up in the country build their sense of self through back-and-forth movement from rural to urban spaces. Therefore, it questions traditional gay migration studies, which have often equated gay migration and rural–urban migration, positing a unidirectional pattern. After contextualizing rural male homosexuality, this paper presents four life itineraries which highlight the central role the city has for rural gay men when exploring their same-sex desires and attractions. Based on the analysis of their life narratives, we show that for most of them, their coming out, their first same-sex experience, and coming to terms with their sexuality happens “far from home” in a city or a college town. However, this research suggests that the city has a more ambivalent role for rural gay men. While the city exists as a space of social practices where alternative sexualities can be experienced and explored, at the same time for many rural gay men the city remains substantially unattractive. In their view, the perceived “effeminizing power” of the city questions and challenges their attraction for this space. Therefore, the experience of the city becomes both liberating and disciplinary – liberating because it allows the exploration of their same-sex desires and attractions, disciplinary because it (re)presents a gay identity in which they find no resonance. Thus this research indicates that rural gay migration to the urban spaces, which is key to identity formation, includes not only departure to the city but also a necessary return to the country to maintain rural gay men’s understanding of themselves.  相似文献   

15.
16.
This study examines the dynamics of socio-cultural change in a peripheral neighbourhood in Istanbul, an "edge city" that is ethnically mixed, culturally heterogeneous, socially differentiated and spatially multi-functional. One major focus in the study is the changing nature of social relations in traditional groups. Though kinship, hemşeri (place of origin) and neighbourhood solidarity is still crucial in the lives of the migrants, participation in these groups becomes more voluntary and the ties among members less obligatory. Secondly, the ethnic and religious groupings in the neighbourhood are not always exclusive, authoritarian and patriarchal communities. What generally appears as rigid communitarian fragmentation is often one of cultural diversity for the residents of the locality. The associational pluralism that exists in the neighbourhood enables people to claim multiple ethnic, religious, political and cultural identities. Thirdly, though they compare unfavourably with their middle class counterparts in the city, the new neighbourhoods provide greater opportunities and more public space for interaction among the members of the locality than for instance, the rural communities. The study also questions the often taken-for-granted image of a rigidly polarized city in view of empirical evidence that indicates the multiple and complex economic and political links between the new neighbourhoods and the broader urban society. Finally, isolation from middle class areas in the city does not necessarily lead to the exclusion of the whole peripheral urban population from urban life, urban institutions and urban culture. These become increasingly present in the new neighbourhoods and available for the majority of the residents. The main conclusion is that Istanbul contains a number of such edge cities, which have powerful integrating and urbanizing influences on individuals.  相似文献   

17.
Few studies directly address the consequences of habitat fragmentation for pollinating insect communities, particularly for the neotropical key pollinator group of stingless bees. Most studies on bees have defined habitat fragments as remnant patches of floral hosts or forests, overlooking the nesting needs of bees. Their conclusion is that habitat fragmentation is broadly deleterious; however, there are contrasting results in the literature. Insightful studies on habitat fragmentation and bees should consider fragmentation, alteration and loss of nesting habitats—not just patches of forage plants –, as well as the permeability of the surrounding matrix to interpatch movement. Here we investigated the effects of fragmentation caused by urbanization on stingless bee species’ composition and richness, as well as the permeability of the surrounding matrix. We collected bees from flowering plants and recorded phytosociological variables of five forest remnants (ranging from 64 ha to 900 ha) in southeastern Brazil. Large fragments did not contain more species per unit area than smaller ones; in fact, we found more species in small fragments, most of which were generalist bees. The presence of more habitat generalist stingless bee species was also correlated to the structure of vegetation in these fragments. In conclusion, the quality of the habitat within a fragment (structure of vegetation) as well as the quality of the matrix has a direct relation to the bee species composition. This can be seen in the direct relationship between structural diversity of the environment and age of the fragments. The matrix that holds the most recent fragments, probably due to the sprawl of the city, is more heterogeneous than the one with the oldest fragments. The most heterogeneous matrices have a certain balance between the trees, buildings and bare soil or herbaceous vegetation coverage, making the array less impermeable to bees.  相似文献   

18.
This article examines the recent deaths of Chicago Public School students. It focuses on the school year between September 2006 and June 2007. At least 30 individuals were killed during that interval. In this school year, the homicides continue at about the same pace. Although violence within the schools had declined and violence (including homicides) was at a lower rate for the city of Chicago, some communities remained vulnerable to this threat. Neighborhood characteristics seem to be contributing factors, but family dynamics and an individual's life style comes into play. The person in the environment that we draw upon in social work has limitations, given new urban problems.  相似文献   

19.
During the past decade, we have witnessed the rise of Shanghai as a new metropolitan centre in China. The city has also become one of the most vibrant sites of lesbian community in the country. The author interviewed 20 lesbian women in the city in 2005. It is found that almost all of the women interviewed are experiencing the pressure of social conformity most severely from their immediate family, and the social expectation of marriage. In this paper, the author demonstrates the conflicts of family and marriage that many of the informants have encountered and how the hegemony of heterosexuality is still securely reproduced and carried out through the discourses of family and marriage in contemporary urban China, and finally, how the informants deal with the controls enacted by the institution of heterosexuality. doi:10.1300/ J155v10n03_06.  相似文献   

20.
郭根  范明英 《城市观察》2012,(4):166-173
城市文化的浅薄与粗俗化倾向、短视与功利化倾向、焦虑与浮躁化倾向构成了城市化进程中文化阂失的主要表征。唯GDP的发展观消解了城市发展理念,造成了社会心理的失衡和城市文化的失序;信仰缺失、信任关系淡化则直接导致了城市文化的碎片化;社会阶层断裂,社会关系网格化也催生了城市文化的淡漠和虚拟。城市化进程中实现科学理性与人文精神的相得益彰、历史传统与时代精神融会的贯通以及世界文明与民族特色的和谐包容呼唤城市发展理念的更新与再造。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号