基于GEE的长三角城市群城市化与生态环境的动态研究

Dynamic Study on Urbanization and Ecological Environment of Yangtze River Delta Urban Agglomerations Based on GEE

随着中国城市化的快速发展,城市群是区域经济协调发展的主要趋势及核心,其生态环境压力却日益见长,如何有效合理地对城市化与生态环境之间的关系进行评价是一个值得关注的问题。以长三角城市群(Yangtze River Delta Urban Agglomerations,YRDUA)为研究区,选用MODIS遥感数据与“类DMSP-OLS”夜间灯光数据为数据源,对研究区域整体与区县的城市化水平、生态环境质量、植被覆盖水平以及其相关耦合程度进行了长时间序列的分析研究。研究结果表明:①2002—2021年长三角城市群整体和各区县的夜间灯光指数(Compounded Night Light Index,CNLI)均呈现上涨趋势;②2002—2021年长三角城市群的遥感生态指数(Remote Sensing Ecological Index,RSEI)与植被覆盖度(Fractional Vegetation Cover,FVC)总体均处于良好水平,由于区域内各区县具有特殊性,局部又呈现显著差异性;③2002—2021年长三角城市群的城市化与生态环境耦合协调指数(Urbanized and Ecological Coupling Index,UECI)从2002年的0.540上升至2021年的0.559,表明城市化水平与生态环境质量的耦合趋势保持稳定。

With the rapid development of urbanization in China,Urban Agglomerations are the main trend and core of the coordinated regional economic development,but their ecological environment is under increasing pressure.How to evaluate the relationship between urbanization and ecological environment effectively and reasonably is a problem that needs to pay close attention to.MODIS remote sensing data and“DMSP-OLS like”nighttime lighting data are used as data sources to analyze the urbanization level,ecological environment quality,vegetation cover level and their related coupling degree in Yangtze River Delta Urban Agglomerations(YRDUA)study area as a whole and in the districts and counties for a long time series.The results show that:①The Compounded Night Light Index(CNLI)of the YRDUA as a whole and each district and county shows an increasing trend from 2002 to 2021;②The Remote Sensing Ecological Index(RSEI)and Fractional Vegetation Cover(FVC)of the YRDUA from 2002 to 2021 are at a good level on the whole,and the differences are significant in localized areas due to the special characteristics of each district and county in the region;③The Urbanized and Ecological Coupling Index(UECI)of the YRDUA from 2002 to 2021 is increased from 0.540 in 2002 to 0.559 in 2021.It indicates that the coupling trend between urbanization level and ecological environment quality remains stable.