Abstract
Abstract. Urban ecological space is a significant factor for sustainable urban development and ecological civilization construction. Traditional urban ecological space analysis mainly used medium-resolution image data at large scales and used high-resolution images at a typical urban scale. Few studies focused on the high-precision ecological space analysis at a national urban scale. In this study, high-precision urban boundary and land cover data were utilized to analyze the urban ecological space change and its reason from 2016 to 2017. Ecological space was extracted and merged from high-precision land cover data, which came from the National Geoinformation Survey data of China. Results showed that in 2017, the total urban ecological space area of 338 prefecture-level cities in China was 8514.2 square kilometers, accounting for 22.4% of the total urban area, which was far below the threshold of 40% for evaluating the urban green coverage in China. Urban ecological space of 184 cities declined. There were four principal reasons for the decrease of urban ecological space. First, the green space supporting the buildings was occupied. Second, the green landscape space near rivers and lakes was occupied. Third, blocks of woodland were occupied. Fourth, the water area was occupied. The reduced urban ecological space was mainly changed into construction sites, structures, and buildings. Urban ecological space of China was seriously insufficient, and it was heavily occupied. Adequate ecological space should be preserved not only in new urban development areas but also in the old urban areas to ensure people a more comfortable living environment.
Highlights
Urban ecological space is an indispensable urban space that guarantees urban ecological security and improves the quality of life of residents
To solve the above problems, this study uses high-precision land coverage data and high-precision urban boundary data obtained with a resolution of better than 2 meters to carry out ecological space delineation within the urban areas
The area of urban ecological space, its proportion to the urban extent, and the change of the above two indicators from 2016 to 2017 were used as the statistical analysis indicators for 338 prefecture-level cities. 40% was used as the threshold for evaluating whether the proportion of urban ecological space was good or not according to “The greening coverage of urban planning and construction areas across the country should be over 40% by 2010” proposed in Notice of the State Council on Strengthening Urban Greening Construction of China
Summary
Urban ecological space is an indispensable urban space that guarantees urban ecological security and improves the quality of life of residents. Some have integrated high-resolution images better than 2 meters and separation characteristics into the extraction of urban boundaries, providing opportunities for high-precision analysis of urban spatial patterns (Ning et al, 2018; Wang et al, 2018). To solve the above problems, this study uses high-precision land coverage data and high-precision urban boundary data obtained with a resolution of better than 2 meters to carry out ecological space delineation within the urban areas. Three hundred thirty-eight prefecture-level cities across the country are taken as research areas to analyze the urban ecological space changes from 2016 to 2017, to provide recommendations for the national urban ecological space risk assessment and how urban residents can get a more comfortable life
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