摘要
随着城市化进程的不断推进、建设用地不断扩张,城市生态空间正处于剧烈变化中。大量具有生态价值和服务功能的土地不断被侵占,以满足暂时的城市建设需求。但从长远来看,这些生态用地的"消失",将不可避免的影响区域生态平衡,给区域经济的健康发展埋下隐患。广州作为华南的中心城市,改革开放以来,大量外来人口涌入,土地利用变化频繁,生态环境的保护面临着巨大压力。因此,本文基于多源遥感数据,利用监督分类法与综合指数法相综合的复合提取方案对2016年广州生态用地进行空间识别,掌握广州市生态用地存量现状。同时,借助生态风险小区和生态风险等景观指数对广州进行了生态风险评估,结果显示,广州市生态风险呈现明显的多核圈层结构,由多核心的中心向外部逐渐降低。
With the continuous advancement of urbanization and the expansion of con- struction land, the urban ecological space is changing dramatically. A large number of land with ecological value and service function has been occupied to meet the temporary urban construc- tion needs. The disappearance of ecological land will inevitably affect the regional ecological balance and lay a hidden danger for the healthy development of the regional economy in the long term. In Guangzhou, the central city of Southern China, the influx of foreign population has caused frequent changes in land use since the reform and opening up, which has laid great pres- sure on ecological environment protection. This paper uses the combined method of supervised classification and comprehensive index to identify the ecological land of Guangzhou in 2016 and get the current storage quantity of Guangzhou ecological land based on multisource remote sens- ing image. Moreover, we evaluate the ecological risks of Guangzhou through the ecological risk community and ecological risk landscape index. The ecological risk of Guangzhou presents obvi- ous multi-core structure which was gradually reducing from the center of the outside.
出处
《城市观察》
2017年第3期19-30,共12页
Urban Insight
基金
广东省科技计划项目“城市不透水面遥感提取技术系统”,项目编号:2016A050502065
关键词
生态用地
多源遥感
生态风险评价广州市
ecological land
multi-source remote sensing
ecological risk assessment
Guangzhou
