中文摘要：

基于压力—状态—响应（PSR）概念模型,从20个指标通过数据标准化处理、指标权重确定和生态安全评价模型的构建,以三峡库区重庆段为例,分析三峡库区重庆段自直辖以来的生态安全问题。运用熵权和AHP的平均值作为权重,结合主观和客观赋权的优点,使评价更为合理。结果表明,三峡库区重庆段1997-2003年生态安全度为很不安全状况,2004-2007年生态安全度为不安全状况。从资源环境压力来看,1997-2007年其ESI一直处于很不安全状况;从资源环境状态来看,1997-1999年为很不安全状态,2000年和2001年为不安全状态,2002-2006年为临界安全状态,2007年为较安全状态;从人文环境响应来看,1997-2004年为很不安全状况,2005-2007年为不安全状况。从压力—状态—响应模型3方面分析对三峡库区重庆段生态安全的影响,据权重值得知,人文环境响应对城市生态影响最大,其次是资源环境状态,影响最小的是资源环境压力。

英文摘要：

An ecological safety index（ESI） system including 20 indices for the Three Gorges Reservoir area in Chongqing was built up following the principles of the pressure-state-response（P-S-R） model.The ecological safety problems were analysed through standardizing the primary data,estimating values of weight and con-structing models for ecological safety evaluation.The study results was made more reasonable by using the av-erage means of the results from the entropy method and AHP method as comprehensive weight values.The Re-sults showed that the Three Gorges Reservoir area in Chongqing was kept at a very unsafe state from 1997 to 2003 and kept at an unsafe state from 2004 to 2007.The resource environment was at very unsafe state from 1997 to 1999,unsafe state in both 2000 and 2001,critical safe state from 2002 to 2006 and relative safe state in 2007.The human enviroment response was at very unsafe state from 1997 to 2004 and unsafe state from 2005 to 2007.The affecting degrees on urban ecological safety of the factors in the PSR model follow a de-scending order of human enviromental response,resource environmental state and resource environmental pres-sure in turns.