Long-term changes and evaluation of eco-environmental quality in mountainous cities in southwest China-Take Chongqing Municipality as an example
In order to study the eco-environmental quality of mountainous cities in southwest China,this paper takes Chongqing as an example and uses remote sensing technology and the Google Earth Engine(GEE)platform to construct RSEI(remote sensing ecological index),and evaluates the eco-environmental quality and its spatial-temporal heterogeneity during 2000-2021 in Chongqing.In order to explore the main influencing factors of eco-environmental quality in mountainous cities,four influencing factors,namely elevation,slope,temperature,and precipitation,were selected to obtain the allocation-de-pendence and slope dependence of RSEI and the response relationship between RSEI and climate factors.The results show that:①The remote sensing ecological index RSEI showed an overall upward trend,and the area with"excellent"ecological quality increased by 130.27%,while the area with"poor"ecological quality decreased by 65.68%.The ecological environment improved,obviously,but there were still regional differences.Low RSEI pixels were mainly distributed in urban areas and showed an expanding trend in urban agglomeration.②It can be seen from the change curve of RSEI with altitude that RSEI in-creases with the increase of altitude from 2010 to 2021.Overall,RSEI increases slowly within the range of 0～1800m and be-gins to decrease within the range of 1 800 m～2 800 m.Similarly,RSEI increases with the slope increase.RSEI leveled off when the slope was greater than 40°.③According to the response curve of RSEI and climate factors,temperature and RSEI are negatively correlated,and the higher the temperature,the lower the RSEI;With the increase of precipitation,RSEI index in-creased gradually.The research shows that the ecological environment quality of Chongqing has improved significantly since 2000 with the development of urbanization and the effective management of the ecological environment.Remote sensing tech-nology can be used to monitor and evaluate the ecological environment quality in the area with perennial cloudy coverage in a long time series,and provide a reference for the ecological environment protection of mountainous cities in southwest China.The results show that the GEE platform can be used to monitor and evaluate theecological environment quality in the southwest mountainous cities with cloud and high vegetation coverage.The ecological environment quality in Chongqing has improved sig-nificantly since 2000.The results of this study can provide exemplary management for the ecological environment protection of mountain cities in southwest China,carry out environmental management according to regional characteristics,and realize the coordinated development of the ecological environment and economy.
Google Earth EngineRSEIsouthwest mountain citychongqingaltitudeclimateconservation of ecology
国家科技期刊平台
NSTL
万方数据
维普
