中文摘要：

以北京市为例，在全面探讨生态用地内涵的基础上，综合运用GIS技术和景观格局理论，分析生态用地空间的演变规律，通过对生态用地的生态服务功能、景观空间结构和生态敏感性的全面分析，构建生态用地空间重要性的评价模型，并以重要生态用地空间为刚性框架，分别按照保留城市面积40％，50％，60％作为重点生态用地的情景，提出北京市城市生态用地空间的布局模式。结果表明：基于保护重点生态用地的城镇发展格局，既能够不以牺牲土地利用的经济价值为代价，又能够保障城市基本生态系统服务及其安全格局，是实现“效率”与“安全”双赢的良性空间布局。

英文摘要：

Taking Beijing as a case study, the ecological land spatial evolution was analyzed based on ecologi- cal pattern theory. With the support of GIS technique, evaluation model for the importance of urban ecological land was established, and the model was designed to account for ecological service function, landscape spatial structure and ecological sensitivity analysis. The important ecological land is used as the framework to delineate future urban growth patterns. Meanwhile, according to three scenes which important urban ecological land occupies the area of the whole city respectively by 40%, 50% and 60% , it analyzed the reasonable spatial distribution of important ur- ban ecological land. The outcome demonstrated that the important ecological land can effectively retain the integrity of ecological processes and prevent urban sprawl, the urban growth pattern based on important ecological land can both satisfy the requirements of competing land uses and establish a solid landscape infrastructure to safeguard the natural resources in Beijing.