基于遥感生态指数的南京市生态变化分析  

Ecological Change Analysis of Nanjing City Based on Remote Sensing Ecological Index

作　　者：张浩[1,2,3] 杜培军[1,2,3] 罗洁琼[1,2,3] 李二珠[1,2,3] 

机构地区：[1]南京大学卫星测绘技术与应用国家测绘地理信息局重点实验室,江苏南京210023 [2]南京大学江苏省地理信息技术重点实验室,江苏南京210023 [3]南京大学江苏省地理信息资源开发与利用协同创新中心,江苏南京210023

出　　处：《地理空间信息》2017年第2期58-62,共5页Geospatial Information

基　　金：江苏省自然科学基金资助项目(BK2012018);中国地质调查局地质调查子项目(12120115050901)

摘　　要：城市化进程不断加快带来一系列生态环境问题,遥感技术可以快速、客观、定量地评价生态环境变化。选取1990、2002、2013年Landsat遥感影像提取湿度、绿度、干度、热度4个评价指标,通过主成分分析方法计算遥感生态指数RSEI,进行南京市生态环境变化定量分析评价。结果表明1990~2013年南京市生态环境质量有一定程度的下降,生态环境变好的区域主要分布在以明城墙为范围的老城区及周边,生态环境变差的区域分布在新近建设的"一城三区"。进一步分析发现,在4个分指标中,代表干度的指标NDBSI对于生态指数RSEI的贡献度最大,说明生态环境质量的下降与不透水面的大幅增加密切相关。In this paper, Landsat remote sensing images of 1990, 2002 and 2013 were chosen as data sources, from which 4 ecological factors were extracted, including humidity, green, dryness and heat. Through principal component analysis, the ecological environment changes of the Nanjing City from 1990 to 2013 were evaluated with a remote sensing ecological index(RSEI).The results revealed that the overall ecological quality of Nanjing had a significant decline. The mean values of RSEI fell to 0.622 in 2002 and 0.554 in 2013 while it was 0.697 in 1990. The proportion of high-grade RSEI area also fell from 68.58% in 1990 to 56.32% in 2002 and then to 44.79% in 2013. The RSEI spatial distribution results show that the ecological condition has been improved in the old city area surrounded by the Nanjing circumvallation, while the ecological quality has become worse in the newlydeveloped urban areas including Hexi, Jiangning, Xianlin and Jiangbei. In the four sub-indicators, the NDBSI index which represents dryness makes the largest contribution of RSEI. It means that the increase of impervious surfaces led to the deterioration of ecological environment quality largely.

关 键 词：生态变化 遥感生态指数 城市扩展 南京市 

分 类 号：P237[天文地球—摄影测量与遥感]