天津城郊污染区土壤Cd的赋存形态及其对蔬菜的影响

介绍了天津城郊污染区土壤Cd元素的赋存形态,探讨了Cd的赋存形态对蔬菜的影响。研究区土壤中Cd的污染程度高,以蔬菜种植为主,水溶态、离子交换态和碳酸盐态这几种容易(或在一定条件下容易)被作物吸收的Cd含量占65.2%;而有机态结合态、铁锰氧化物结合态和残渣态等难被作物吸收的Cd含量低,仅占23.3%。污染区大白菜、芹菜和油麦菜3种蔬菜中的Cd与土壤中Cd的全量、Cd的多种形态都呈较明显的正相关。油菜、芹菜和油麦菜样品存在超标现象。     

Types of Public Spaces: The Polish Contribution to the Discussion of Suburban Public Space

Intensive suburbanization, especially in postsocialist countries, and a deficiency of fully public spaces result in an increasingly complex mixture of different types of spaces of public functions. Where there is a deficiency of completely public spaces, their role can be enhanced by those places available to the public for a specified period of time and under certain circumstances. Such places are provided and maintained not only by the public but also by the private sector. This article explores the diversity of places of public character and looks for criteria that organize this diversity. It introduces a new typology that corresponds mainly to the suburbs and combines five criteria of categorization: intended users, time limits as to access, prevailing form of control, intended functions, and visual characteristics. The typology draws attention to the role of spaces not intended for all the public but for selected groups and that of spaces with time-limited access. Such semipublic places are consistent with the lifestyle of suburbanites and therefore play an increasingly important role in suburban social life.     

Immigration,local policy,and national identity in the suburban United States

Since 2000, the American suburb has emerged as a principal destination for new immigrants to the United States, both documented and undocumented. Whereas some suburban communities have responded to perceived undocumented immigrants with hostility in the form of exclusionary local immigration policies, others have introduced policies designed to welcome immigrants independent of federal legal status. In this article, I employ a qualitative comparative case study analysis of four local immigration policies in the Chicago and Washington DC metropolitan areas to explain how suburbs justify their policy positions. I find that these suburban communities relied on conceptions of American identity and the ‘American Dream’ in support of their policies, but leveraged these tropes in vastly different ways depending on the broader strategic purposes of the policies. These divergent suburban immigration policies both challenge traditional notions of suburban political and cultural homogeneity and reveal how such heterogeneity has produced a distinct unevenness in contemporary local policy responses to undocumented immigration within metropolitan regions.     

基于个体时空邻近指数的户籍维度社会空间分异研究——以上海市郊区10个典型镇为例

社会空间分异是城市研究的经典议题。在人类移动性不断增强的背景下,传统的基于居住空间汇总的社会空间分异测度方法表现出一定的局限性,对于居住空间外的日常活动空间隔离的探讨相对缺乏,对于不同活动和不同时段间分异格局差异的考虑有所不足。因此有必要从“基于人”的视角出发,探索社会空间分异测度的新方法,探讨不同时空间维度的社会分异格局。本研究基于上海市郊区10个典型镇的活动日志调查数据,构建“个体时空邻近指数”,聚焦户籍这一反映中国城市特征的重要维度,以不同户籍类型人群之间的分异程度为研究对象,分析其时空间特征,并对结果进行可视化。研究表明：上海市不同户籍人群在活动、时间和空间维度上存在明显的社会空间分异。本研究创新了基于活动空间的社会空间分异测度方法,从活动与时空间结合的视角探讨了户籍维度的社会空间分异,为更好的理解在中国大城市日益凸显的社会空间分异问题提供了新的视角。     

小微湿地修复实践:以江西省林业科学院竹园小微湿地为例

小微湿地建设是实施乡村振兴战略、建设美丽宜居乡村战略的重要组成部分。以江西省林业科学院城郊竹园小微湿地修复为例,通过系统分析本底条件,运用多种生态恢复技术和修复措施,结合景观与科普宣教建设对小微湿地进行科学综合的修复建设。竹园小微湿地修复后,湿地生物多样性增加,生态系统功能完善,实现了水质净化、水土涵养、景观游憩和科普宣教等多种功能目标。     

城市化与城市近郊乡村旅游开发研究--以成都邛崃市鹤鸣村为例

城市近郊区是一个极不稳定的区域。呈现动态变化的过程,其变化受城市化进程的影响。近年来,乡村旅游在城市郊区、特别是城市近郊的各种旅游中发展十分活跃。但是缺乏科学的理论指导。该文根据城市化作用下的城市近郊乡村旅游演变的规律和原理,以成都邛崃市鹤鸣村为例,探讨城市化对城市近郊乡村旅游的影响,分析城市化影响下鹤鸣村乡村旅游地生命周期的发展进程,提出鹤鸣村乡村旅游开发的建议。     

Human–Nature Relations in Suburban Gardens

Gardens have been considered predominately in terms of a nature–culture binary, with nature positioned as a passive object of human control. Placing the human at the centre of the garden, these perspectives understand this space in terms of human cultures, needs and understandings. This paper critiques these perspectives, questioning whether gardens are ever simply human constructions. Actor–network theory (ANT) provides a framework for this research, which examines human–nature relations through a focus on the material processes of gardening. Drawing on interviews with suburban gardeners in northern Sydney and the analysis of two popular gardening magazines, the research shows that gardening entails an embodied engagement between active human and non-human actors. Involving processes of collaboration, negotiation, challenge and competition, gardening is a dynamic process. Describing human relations with the plants of the garden, this research argues for gardens to be understood as hybrid achievements.     

A STUDY ON LOCATION OF TOWNSHIP INDUSTRY IN SHANGHAI SUBURBS

The township industry in Shanghai suburbs has undergone a rapid development in the past few years. Aimed at studying the spatial law of the township industry in Shanghai suburbs, three kinds of indexes including distribution density, economic benefit, and regional structure are selected and analysed using correlation analysis method. There are 12 indexes in total. It is found that the locational variation of the township industry in Shanghai suburbs conforms to the following distribution equation:y=ae-bx (x> 5)The above equation has been more and more conforming to the real distribution of the township industry. It is obvious that decreasing trend from inner suburban districts to outer suburban districts is an important character of the locational variation of the township industry of Shanghai suburbs. The fact is closely related with the radiation intensity of the urban economy and the locational superiority for the development of township industry. The regional strategies of the township industry of S     

Watering the suburbs: distinction,conformity and the suburban garden

Research on domestic water use has conventionally been confined to understanding the role of physical variables such as rainfall and temperature in influencing patterns of consumption. In limiting research to this narrow focus, the significance of socio‐cultural variables has been largely ignored. This paper seeks to develop socio‐cultural understandings of domestic water use by examining water consumption as part of a broader set of consumption practices associated with suburban space. In particular, the socio‐cultural dimensions are explored on a local scale through an exploration of water‐use patterns associated with the new suburban garden: an important site of home‐making processes, and one associated with a substantial proportion of domestic water consumption. The notion of cultural capital is adopted as a framework for examining these consumption patterns. Water consumption is analysed as a practice through which cultural capital can be accumulated. It is argued that the contrasting notions of social distinction and social conformity in the suburban garden shape the accumulation of cultural capital and influence patterns of water consumption. Understanding these socio‐cultural dimensions of water consumption is important in shaping water‐use management, an issue discussed throughout the paper.