Abstract
Ecological conservation red line (ECRL) is gaining increasing academic attention as delimiting the minimum space scope of ecological protection and the bottom line of ecological security. Taking Nanjing as a case study, we divided the territory into ecological and non-ecological redline areas (ERAs and NERAs, respectively). This paper highlights two key research issues based on the 2005, 2010, 2015 and 2018 annual remote sensing data: (i) quantitative analysis of the Ecological Redline Policy (ERP) validity by conducting a horizontal comparison of the ERAs and NERAs; and (ii) exploration of the land-use transitions and spatial pattern changes affecting ecosystem service value (ESV). Results showed that delineating ECRL could effectively slow down the decline rate of ESV. The trend of eco-quality deterioration was greater than eco-quality improvement in Nanjing, presenting an ESV that declined slightly in the whole. According to our findings, we suggest that reasonably increasing eco-lands (woodland and water area) and decreasing construction land will enhance the regional ESV. Meanwhile, promoting the transition from production space to ecological space and depressing the encroachment of living space on other space types, will be instrumental in mitigating the ESV decline. The results of this study are expected to provide valuable implications for spatial planning and sustainable development in Nanjing.
Highlights
Accepted: 14 April 2021Cities are the key administrative units of land-use planning at home and abroad, and ecosystem service (ES) valuation plays a supporting role in urban land-use planning [1,2].China has entered a new growth stage, with a dominating style of being an urban society compared to a rural society in the past; this new urbanization has become a national strategy and urban quality has been highly valued [3,4]
Given the spatial quantity structure (Figure 3b), ecological space accounted for about 57% of the land area, and production space was less than a quarter of the total area; the proportion index of both was the highest and smallest of Production–living–ecological space (PLES) in the ecological redline areas (ERAs), respectively
With the development of urban expansion and social economy, living space continued to grow and its area had increased by 67.47 km2 in 13 years, with an overall escalating rate of 24.71%; ecological space showed a tendency of first declining and growing, with the area descending by 4.21 km2 from 2005 to 2015, and increasing by 22.02 km2 from 2015 to
Summary
Accepted: 14 April 2021Cities are the key administrative units of land-use planning at home and abroad, and ecosystem service (ES) valuation plays a supporting role in urban land-use planning [1,2].China has entered a new growth stage, with a dominating style of being an urban society compared to a rural society in the past; this new urbanization has become a national strategy and urban quality has been highly valued [3,4]. Ecological conservation red line (ECRL) means the minimum spatial scope of ecological protection and the bottom line of ecological security, as well as the baseline area for the management of regional resources and the environment [8]. It is mainly delineated in important eco-function areas, ecologically fragile hotspots, and important species habitats, providing ESs to guarantee and maintain ecological security, living environment security, and biological security [9,10,11]. Studying China’s ECRL in preserving nature, Published: 16 April 2021
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