摘要
利用Landsat卫星影像,采用新型遥感生态指数（RSEI）对海岛型城市厦门在不同时期的生态变化进行研究,以期揭示城市的快速发展对城市生态质量的影响。研究结果表明,1993~2009年,厦门岛的城市建筑用地虽经过大幅扩张,但并没有造成生态质量的大幅下滑,其RSEI生态指数值仅略为下降。分析表明,这主要是得益于厦门城市发展的科学规划。但是厦门岛西北部的生态较差,是今后进一步改善生态的重点地区。
Timely and precisely monitoring of ecological responses to urban′ s fast expansion has become a very important issue for regional decision-makers. To meet this requirement, this article utilized a recently developed, remote sensing based ecological index（RSEI） to assess the urban ecological quality change in Xiamen,an island city located in Fujian Province, southeastern China, during the past two decades. The RSEI was constructed by integrating four important ecological indicators including greenness, wetness, dryness and heat.It can be represented respectively by four remote sensing indices or components, i.e., normalized difference vegetation index（NDVI）, index-based built-up index（IBI）, wetness component of the tasseled cap transformation（Wet）, and land surface temperature（LST）. The principal component analysis（PCA） was utilized to compress the four indicators into four PC components. Instead of using a simple, traditional weighted addition algorithm,the first component（PC1） was used to construct the RSEI because the PC1 is the best one among the PC components to represent the four indicators. Time-series Landsat Thematic Mapper（TM） images of 1993 and 2009 of Xiamen scenes, both acquired in summer season, were employed to compute RSEI and evaluate the ecological quality of the island. The successful application of the RSEI in Xiamen has reveled that, in spite of a fast urban expansion in the island during the study period from 1993 to 2009, the ecological quality of the island has not degraded substantially, because the RSEI value only declined slightly from 0.558 in 2003 to 0.534 in 2009.This is mainly owing to a scientific urban planning for the island city, which kept sufficient green spaces for the city and hence resulted in a much higher ratio of urban green spaces in 2009 than that in 2003. Nevertheless, low-grade ecological conditions have also been detected by the leveled RSEI map in the newly developed northwestern part of the island city, where the Xiamen Airport is
出处
《地理科学》
CSCD
北大核心
2015年第7期867-872,共6页
Scientia Geographica Sinica
基金
国家科技支撑项目(2013BAC08B01-05)资助
关键词
城市生态
遥感
RSEI指数
主成分分析
厦门
urban ecology
remote sensing
RSEI
principal component analysis
Xiamen
