北京西南地区区域生态安全评价

根据陆地表层气候-植被-土壤自然综合体的地带性分布规律，综合区域自然环境背景、生态系统稳定性、景观结构和外界干扰4个方面，以地理信息系统和模糊数学作为支撑，构建了区域生态安全评价指标体系和评价方法，并依据北京西南地区近30年来的气候、土壤等背景数据，计算了整个区域2004年的生态安全指数．结果表明：北京西南地区中部及西部山区、浅山区的区域生态安全程度较高，南部及东南部平原地区的区域生态安全状况较差；山区的各种采矿行为已经影响了北京西南地区西部山区的生态安全，必须采取一定的关停措施．对北京西南地区的案例研究表明：该评价方法可以克服目前区域生态安全评价中存在的问题，评价结果能够反映区域生态问题和区域各个局部位置的生态安全状况．

Regional eco-security assessment of southwest Beijing

Based on the zoning regulation which integrated climate, vegetation and soil as a complex, a regional eco-security index system consisting of regional physical background, ecosystem stability, landscape structure, and external interference was established, and, with the support of geographical information system technology and fuzzy mathematics, a set of regional eco-security assessment methods was constructed. By means of these methods, the eco-security index of southwest Beijing in 2004 was calculated based on the recent 30 years background data of climate and soil. The results showed that in southwest Beijing, the eco-security degree was higher in its central area and western hilly-shallow hilly areas, but lower in its southern and southeastern plain areas. The mining activity in southwest Beijing had threatened the environment, and should be stopped immediately to maintain the regional eco-security. It was proved in the case study that the assessment index system and related methods established in this paper could solve the existing problems in assessing regional eco-security, and the assessment results could reflect the regional ecological issues and the status of eco-security at different locations within the region.