Urban agglomeration of the Yangtze Delta （UAYD）, one of the most developed regions of China, has witnessed an increasing prevalence in building ecological cities when the ecological cities are pursued by many modem ...Urban agglomeration of the Yangtze Delta （UAYD）, one of the most developed regions of China, has witnessed an increasing prevalence in building ecological cities when the ecological cities are pursued by many modem cities, and great achievements have been made in this regard. It is inevitable, however, that certain problems exist during the construction of ecological city, which include but not limited to non-harmonious development of urban complex ecosystem, and the difficulty in quantifying eco-city construction or incomplete quantification in assessing the construction of present and future eco-city. Based on the analysis on social-economic conditions and regional conditions of the UAYD, this paper attempts to set up an index system of eco-cities combining with local characteristics, and to adopt the indices of eco-city, urban harmony, and eco-city colligate to evaluate the ecological level, urban harmonious development and eco-city construction of cities within the UAYD. Results indicate that among 15 cities in UAYD, Suzhou City ranks the highest in terms of eco-city construction, whereas Nantong ranks relatively lower; sustainable eco-city construction is possible only when cities are developed in every respect of harmony.展开更多
As a very important part of the urban ecosystem,the urban green space system plays an active role in maintaining the urban ecosystem stability,providing ecosystem services,and improving the quality of the urban enviro...As a very important part of the urban ecosystem,the urban green space system plays an active role in maintaining the urban ecosystem stability,providing ecosystem services,and improving the quality of the urban environment.In order to deal with the problems brought about by the deterioration of the urban ecological environment,it is necessary to study and analyze the spatial distribution pattern,evolutionary characteristics and ecosystem services of urban green space to maximize its ecological benefits and comprehensive functions.In this study,we took Beijing urban area as an example,and based on the spatial distribution data of urban green space and remote sensing data,we first calculated the urban green space type transition matrix,landscape pattern index and ecosystem services.Then,we analyzed the changes in urban green space landscape patterns,ecosystem services and their spatial distributions from 2000 to 2020,and studied the interactive relationships between landscape changes and changes in ecosystem services.The results showed three key findings.(1)Beijing’s urban green space construction has achieved remarkable results from 2000 to 2020.The area of green space has increased by 77.41%,mainly from cultivated land and construction land.(2)From 2000 to 2020,the amounts of dust retention,SO_(2) absorption,NO_(2) absorption,cooling and humidification,carbon fixation and oxygen release,and rainwater runoff reduction in Beijing’s urban green space have shown continuous increases in general.(3)There is a close relationship between urban green space landscape changes and green space ecosystem services,and total area(TA)has the highest correlation with ecosystem services.Except for rainwater runoff reduction,the correlation coefficients between TA and ecosystem services are all higher than 0.85.This research can provide theoretical guidance for optimizing Beijing’s green space and determining how to maximize the effect of green space for improving the ecological environment,and ultimately provide a scientific basis for the construction of Beijing’s ecological environment.展开更多
文摘Urban agglomeration of the Yangtze Delta （UAYD）, one of the most developed regions of China, has witnessed an increasing prevalence in building ecological cities when the ecological cities are pursued by many modem cities, and great achievements have been made in this regard. It is inevitable, however, that certain problems exist during the construction of ecological city, which include but not limited to non-harmonious development of urban complex ecosystem, and the difficulty in quantifying eco-city construction or incomplete quantification in assessing the construction of present and future eco-city. Based on the analysis on social-economic conditions and regional conditions of the UAYD, this paper attempts to set up an index system of eco-cities combining with local characteristics, and to adopt the indices of eco-city, urban harmony, and eco-city colligate to evaluate the ecological level, urban harmonious development and eco-city construction of cities within the UAYD. Results indicate that among 15 cities in UAYD, Suzhou City ranks the highest in terms of eco-city construction, whereas Nantong ranks relatively lower; sustainable eco-city construction is possible only when cities are developed in every respect of harmony.
基金The National Natural Science Foundation of China(41971272)The Guangxi Science and Technology Major Project(AA20161002-3)The Strategic Priority Research Program of Chinese Academy of Sciences(XDA20020402)。
文摘As a very important part of the urban ecosystem,the urban green space system plays an active role in maintaining the urban ecosystem stability,providing ecosystem services,and improving the quality of the urban environment.In order to deal with the problems brought about by the deterioration of the urban ecological environment,it is necessary to study and analyze the spatial distribution pattern,evolutionary characteristics and ecosystem services of urban green space to maximize its ecological benefits and comprehensive functions.In this study,we took Beijing urban area as an example,and based on the spatial distribution data of urban green space and remote sensing data,we first calculated the urban green space type transition matrix,landscape pattern index and ecosystem services.Then,we analyzed the changes in urban green space landscape patterns,ecosystem services and their spatial distributions from 2000 to 2020,and studied the interactive relationships between landscape changes and changes in ecosystem services.The results showed three key findings.(1)Beijing’s urban green space construction has achieved remarkable results from 2000 to 2020.The area of green space has increased by 77.41%,mainly from cultivated land and construction land.(2)From 2000 to 2020,the amounts of dust retention,SO_(2) absorption,NO_(2) absorption,cooling and humidification,carbon fixation and oxygen release,and rainwater runoff reduction in Beijing’s urban green space have shown continuous increases in general.(3)There is a close relationship between urban green space landscape changes and green space ecosystem services,and total area(TA)has the highest correlation with ecosystem services.Except for rainwater runoff reduction,the correlation coefficients between TA and ecosystem services are all higher than 0.85.This research can provide theoretical guidance for optimizing Beijing’s green space and determining how to maximize the effect of green space for improving the ecological environment,and ultimately provide a scientific basis for the construction of Beijing’s ecological environment.
