以兰州新区为例,基于GIS和RS技术,以2004年Landsat7 ETM遥感影像为主要数据源,借助于GIS空间分析功能,并选用熵权法来计算各指标的权重,对兰州新区进行生态安全综合评价。结果表明:兰州新区生态安全分布不均匀,地区生态安全差异明显,生态安全分区的空间分布规律呈现由新区核心区域向新区四周依次增加。建议对生态安全指数较低区域进行生态规划和建设,并对指数较高区域进行生态修复,使其成为兰州新区的天然保障。
Based on the technology of GIS and RS,the RS image of Landsat 7ETM in 2004 was used as the main data source.In the paper,with the new district of Lanzhou City as an example,the ecological security was evaluated by means of GIS spatial analysis functions and the entropy weight method,and countermeasures were put forward.Results show that the distribution of ecological security was uneven in Lanzhou and the differences were significant.Ecological security indexes were increased from new center area to the surrounding areas.The suggestion was that ecological planning and construction were constructed in the areas with lower indexes of ecological security,ecological restoration were constructed in the areas with higher indexes.
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