中文摘要：

脆弱性理论是分析人地相互作用程度、机理与过程的重要工具,为可持续性评估研究提供了新的视角。将社会脆弱性工具应用到城市边缘区研究中,视快速城市化为主要干扰,选取西安城市边缘区所辖街道为基本单元,从暴露度、敏感性、适应能力3方面构建社会脆弱性评价框架与指标体系,综合运用熵值法、函数模型法以及遥感与地理信息系统技术对社会脆弱性程度进行评价,揭示社会脆弱性空间分异格局,探究社会脆弱性关键影响因素及其影响机制。结果表明：①西安城市边缘区的暴露度格局呈现出自中心向外围渐趋减缓的特征;敏感性程度的高、低分布与暴露度的低、高分布在空间上具有相似性;适应能力的空间规律性不明显;②社会脆弱性空间分布不均衡,以中、低等级为主,低等级街道分布在城市内边缘区,中等级街道分散在城市外边缘区;③建设用地面积比重等8个因子对社会脆弱性有重要影响,土地利用方式与景观格局的变化以及物质与社会发展的不平衡是城市边缘区社会脆弱性形成的主要原因,社会系统体制转换阶段的差异进一步加剧了社会脆弱性;④城市边缘区应通过优化系统内部结构和功能以适应城市化的扰动,包括制定适应性管理政策和加强城市边缘区社会适应能力建设。

英文摘要：

Vulnerability theory is an important tool to analyze the degree, mechanism and process of interaction between human and environment, which provides a new perspective for the research of sustainability assessment. Applying the tool of social vulnerability to studies of urban fringe, we consider that rapid urbanization is the major disturbance to social system of urban fringe. Taking Xi＇an as an example and selecting 25 subdistricts in Xi＇an urban fringe in2013 as the basic units, this paper constructs an evaluation framework and index system of social vulnerability in urban fringe from the perspectives of exposure, sensitivity and adaptive capacity. By using entropy method, function model and combining with Fragstats software,remote sensing and geographic information system technology, this paper reveals the spatial differentiation pattern and key influencing factors of social vulnerability in Xi＇an urban fringe.The results are shown as follows：（1） The exposure pattern of Xi＇an urban fringe is gradually slowing down from the center, and the distance from the fringe to the center of the city has a prominent effect on the spatial distribution of exposure. High sensitivity and low exposure, as well as low sensitivity and high exposure have similar characteristics in spatial terms. Affected by non- spatial factors, the spatial regularity of adaptive capacity is not obvious, which is mainly affected by urbanization on the time scale.（2） The degree of social vulnerability and its spatial distribution are imbalanced, and the social vulnerability indexes are dominated by middle and low levels. The units of low social vulnerability indexes are distributed in the inner of urban fringe, while the units of middle social vulnerability indexes are dispersed in the periphery of urban fringe.（3） There are eight factors, including proportion of construction land,having important impacts on the social vulnerability. The change of land use pattern and landscape, as well as the imbalance of material and social d