西安城区土地利用与生态安全动态变化

The Dynamics of Land Use and Ecological Security in Urban Area of Xi'an

土地利用结构与土地利用方式对生态安全有着深远的影响,分析城市土地利用变化与城市生态安全动态,为进一步研究城市生态安全格局下的土地利用优化配置及不同土地利用类型产生的生态服务功能价值提供了理论指导。本文利用2000年、2007年两期遥感影像,解译得到2000年与2007年西安城区土地利用图;在ARCGIS支持下将土地利用图进行空间叠置分析,揭示了近7年西安城区土地利用动态变化情况;运用PSR模型构建生态安全评价指标体系并应用信息熵与AHP法确定指标权重;利用功效函数对各指标进行无量纲化处理,采用综合指数法计算生态安全综合指数;将土地利用图与生态安全评价图做叠置分析,得到了生态安全格局与土地利用格局间的内在联系。

This paper used remote sensing images of Xi＇an in 2000 and 2007, had analyzed the process of Xi＇an land use change during 2000-2007,then had constructed the ecological security evaluation indicator system of Xi＇an basis on PSR model, and had determined the weight of indicator by the methods of AHP and Information Entropy, and then had implemented nondimensionalization by power function and had calculated the index of ecological security by integrated index model, At last,making an overlay analysis between land use chart and ecological security evolution map, has obtained the inner link between ecological security condition and land use pattern.