摘要
随着经济的快速发展,城市生态安全状况令人担忧.进行城市生态安全评价及动态变化研究,了解城市生态安全状况成为城市生态建设、改善和提高城市生态安全状况的前提.基于生态安全数字化评价成果,通过构建提取生态安全变化信息的数学模型,生成生态安全变化图层,研究经济快速发展的近15年广州市生态安全变化的时空特征,并进行趋势分析,得出以下主要结论:①从总体来看,东北部山地区域(增城和从化市境内)生态安全水平以基本不变和略微减小为主,而花都区的东南部、中心城区以及番禺区内则以增加类型为主.②从区域内部来看,生态安全指数变化呈现出区域特色.中心城区以不变化为主要类型,增大和减小类型的曲线则以某一直线为轴而对称,呈交替变化的特点;与之差别最大的是番禺区,曲线呈现先升后降的特点,升降幅度相近.③生态安全指数变化的时段特点突出.④从变化趋势来看,生态安全变化表现为波动的不平稳变化.
Regional eco-security is going bad with rapid urbanization. Understanding status and dynamics of eco-security and making assessment of eco-security are the basic work to improve the state of regional eco-security. Based on the digital assessment of regional eco-security in Guangzhou done by the author, the paper construeted mathematical model to obtain changing information of eco-security, classified and acquired changing type layers of eco-security. In the past 15 years during regional economic developing rapidly, temporal-spatial characteristics of eco-security were investigated and the tendency of eco-security in the region was analyzed. The main results were showed as follows： （1）the eco-security was maintained steadily or decreased little in northern part of Guangzhou, such as districts of Zengcheng and Conghua; the eco-security was mainly improved in city center, Panyu and southern part of Huadu. （2）In internal region, there was an obvious variation characteristics of eco-security indices. In city center, the main types of index changing were steady, some indices showed increasing or decreasing, but for those indices there was a line to separate symmetrical two parts. In Panyu, period changing of indices was obvious, with some indices increasing first and then decreasing with the same changing extent. （3）In whole region, period changing of eco-security indices was important type. （4）Variation of eco-security indices showed fluctuation and unsteadiness.
出处
《广州大学学报（自然科学版）》
CAS
2009年第1期75-80,F0003,共7页
Journal of Guangzhou University:Natural Science Edition
基金
广州市属高校科技计划项目(08C027)
广州大学博士启动基金项目(gjz1)
