基于3S技术的广州市生态安全景观格局分析

生态安全已经成为国家安全的组成部分,成为区域、国家可持续发展研究的重要内容.基于生态安全的数字评价图,从生态安全的等级配置和空间结构的角度,分别运用景观指数和半变异函数的方法探讨广州市生态安全的景观格局与动态特征.景观指数法分析结果显示,广州市生态安全现状以一般安全为主,生态安全曾在1995年受创,但其总的趋势良好;从景观破碎化、形态复杂性以及景观多样性来看,生态安全的时间与空间分异明显.变异函数的结果表明,生态安全的可预测性高,研究区生态安全可能存在等级结构.

Dynamic analysis of the Guangzhou landscape eco-security pattern based on 3S technology

The security of ecosystems (eco-security) has become a primary goal of national safety in China, and has become the most important content for sustainable development investigations of the Guangzhou region and the nation as a whole. Based on the eco-security digital assessment figures, landscape index and semivariable function methods were used to study the landscape patterns and dynamic characteristics of Guangzhou, as views from class distribution and space construction. The landscape index showed that the eco-security of Guangzhou is mainly in a moderate level now. Though damaged in 1995, eco-security has begun to improve. From the aspects of fragmentation-complexity of shape and multiformity for landscape-the eco-security audit showed it obviously changes in time and space. The results of the semivariable function investigation showed that eco-security had a high predictability, and there should be a different grading structure for assessing eco-security in the research district.