中文摘要：

为了分析土地利用变化影响下的城市生态安全水平的动态变化,选择中部快速城市化地区的郑州市为研究区域,研究时间为1992—2009年。在分析郑州市主要生态安全问题的基础上,以GIS和RS为平台,基于PSR（压力-状态-响应）模型,选择能够反映郑州市生态安全状况的人文社会环境压力指标、自然生态环境状态指标、人文环境响应指标,拟定了具有区域特色的郑州市生态安全综合评价指标体系;运用生态安全综合评价模型计算了研究区1992年、2001年、2009年的区域生态安全指数,进一步分析了研究区的生态安全状况。结果表明：1）郑州市生态安全总体水平不高,以临界安全等级为主,较安全状态区域所占比重不大;2）从时间动态上看,近17年来郑州市生态安全指数中未发生变化类、增加类、减小类面积所占比例分别为72.72%、12.25%、15.53%,生态安全指数增加类的面积小于减小类的面积,表明郑州市的生态安全整体水平在往不安全的方向发展;3）从空间分布上看,近17年来区域生态安全水平变化的空间差异较为明显,金水区、管城区、中原区、惠济区的周边,以及市区和中牟县北部沿黄滩涂生态安全指数以减小类型为主,而二七区、荥阳市西南部山区及其北部沿黄部分区域生态安全指数以增加类型为主。研究表明,评价模型能够实现像元、区域、整体不同尺度的评价。

英文摘要：

This paper is purposed at the city ecological security as sessment with the fastpace urbanization by taking Zhengzhou City as a case study sample. In this paper, we have established a PSR eco logical security assessment model by choosing a period from 1992 to 2009. Based on the GIS and RS software platform, we have conduct ed a main ecological security situation analysis of Zhengzhou City, concerning the appropriate humanistic and social environmental pres sure indexes, the natural eeoenvironment state indexes, humanenvi ronment response indexes, all of which can be taken to reflect directly the regional ecological security levels respectively in 1992, 2001 and 2009 as our ecological environmental security evaluation indicators of the city. With the ecological security assessment model, we have done another rather systematic analysis of the ecological security situ ation. From the above studies, we have gained the following conclu sions： （1） The overall eeoenvironmental security level of the city is not high, which implies it is basically safe, but not so many areas can be said faMy safe; （2） From the point of view of the current eco environmental safety for living routine, 72.72 % of the above areas may account for the remainingsafe or undisturbed area; 15.53 % of them accounts for the improving area, whereas 12.25% of them ac counts for the worsening areas in the past 17 years, which indicate the ecological security situation of Zhengzhou City tends to become worse; （3） From the perspective of spatial distribution, it can be said that the regional ecological security change reveals a marked differ ence in the past 17 years. For example, the areas around Jinshui （Gold Water） District, Guancheng District, Zhongyuan District, ttuiji District, and the downtown areas as well as intertidal zone（the zone between the urban area and rural area） along the Yellow River in the north of Zhongmu County, the ecoenvironmental security level of the said areas can be mainly put into the d