以民勤县为研究对象,选取分维数倒数和分离度两个景观格局指标以及沙漠化敏感性、盐渍化敏感性和土壤侵蚀敏感性3个生态系统敏感性因子构建景观类型生态脆弱度和区域生态脆弱度模型。以景观格局和生态敏感性相结合,利用GIS技术对民勤近20年的生态环境演化进行综合分析和评价。结果表明,1986—2006年间,民勤县的生态环境不断恶化,并呈现急剧加速恶化态势。1986—2000年,生态环境呈逐级恶化趋势,且有一定规律,即只从生态好的级别向差的级别转化,很少出现生态环境改良的现象,说明该地区自然生态的调控能力几尽丧失,也表明在此期间人为改良行为较少；2000—2006年,生态环境呈越级恶化现象,并表现为无序状态,同时出现生态环境改良的现象,表明此期间,生态加剧恶化,同时人为在进行生态改良努力。

The eco-environment vulnerability in Minqin County, Gansu Province of China was studied by making use of landscape pattern indices and ecosystem sensitivity indices. A model was developed based on two landscape pattern indices (reciprocal value of patch fractal dimension and patch isolation) and three ecosystem sensitivity indices (sensitivity of aeolian desertification, sensitivity of soil salinization, and sensitivity of soil erosion). Combining these two types of indices, we evaluated the evolution of eco-environment vulnerability in Minqin County during 1986-2006 through GIS analysis. Results showed that the eco-environment in Minqin County deteriorated with a rapidly accelerating trend from 1986 to 2006; it deteriorated gradually from 1986 to 2000 and there was rarely eco-environmental improvement phenomenon, indicating that the repairing ability of the natural ecology was limited and there were few human improvement measurements; the eco-environment deteriorated in a wave state from 2000 to 2006 and the eco-environment improved in some areas, indicating the active action of human activities.