成都市生态环境质量动态变化遥感监测分析

中国工业化和城市化进程中,城市生态环境发生了巨大变化。以2000年、2009年、2018年三期遥感影像为数据源,提取反映城市生态环境质量的绿度、湿度、热度、干度等指标,采用主成分分析法客观、定量地对成都市生态环境质量进行了分析和评价,结果表明:(1)2000-2018年,成都市生态环境质量呈先下降后上升的趋势,RSEI均值分别为0.55、0.47、0.51,总体下降了0.04;(2)空间上,成都市生态环境质量差的区域主要分布在中心城区,随着城市蔓延逐渐向四周分散;(3)2000-2009年是成都市生态环境迅速恶化的一个时期,在生态环境质量分级中优、良等级所占面积和比例大幅下降,而极差、差等级则迅速上升;2009-2018年随着成都市环境治理力度的加大,生态环境得到改善。

In the process of industrialization and urbanization in China,great changes have taken place in the urban ecological environment.Taking the remote sensing images of 2000,2009 and 2018 as data sources,the indexes of greenness,humidity,heat and dryness reflecting the quality of urban ecological environment were extracted.The principal component analysis method was used to analyze and evaluate objectively and quantitatively the eco-environmental quality of Chengdu City.The results show that:(1)From 2000 to 2018,the eco-environmental quality of Chengdu decreased at first and then increased.The average value of RSEI was 0.55,0.47,0.51 respectively,which decreased by 0.04%.(2)Spatially,the areas with poor eco-environmental quality in Chengdu City are mainly distributed in the central urban area,and gradually dispersed around with the spread of the city.(3)The period from 2000 to 2009 is a period of rapid deterioration of the ecological environment in Chengdu City.In the eco-environmental quality classification,the area and proportion of excellent and good grades decreased significantly,while the extremely poor and poor grades increased rapidly.From 2009 to 2018,with the strengthening of environmental governance in Chengdu City,the ecological environment has been improved.