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Beyond green environments: Multi-scale difference in human exposure to greenspace in China
Bin Chen1, Ying Tu2, Shengbiao Wu3
1Future Urbanity & Sustainable Environment (FUSE) Lab, Division of Landscape Architecture, Faculty of Architecture, The University of Hong Kong, Hong Kong Special Administrative Region; Institute for Climate and Carbon Neutrality, The University of Hong Kong, Hong Kong Special Administrative Region; Institute of Data Science, The University of Hong Kong, Hong Kong Special Administrative Region.
This study reveals significant differences in greenspace exposure across China, highlighting how scale impacts environmental justice. Newer urban areas generally offer better access to green spaces than older ones.
Area of Science:
- Environmental Science
- Urban Planning
- Public Health
Background:
- Greenspace exposure metrics are vital for understanding health benefits and environmental disparities.
- Existing studies lack national-scale assessments, limiting policy development.
- A comprehensive, multi-scale analysis of greenspace exposure across China is needed.
Purpose of the Study:
- To conduct a holistic assessment of multi-scale greenspace exposure across China.
- To model population-weighted greenspace exposure at various administrative levels.
- To identify disparities and inform environmental justice initiatives.
Main Methods:
- Nationwide mapping of fractional greenspace coverage using Sentinel-2 satellite imagery (10m resolution).
- Modeling of population-weighted greenspace exposure across multiple spatial scales (provinces to land parcels).
- Analysis of greenspace exposure variations and comparison with greenspace coverage.
Main Results:
- A prominent scaling effect on greenspace exposure was observed across China's administrative divisions.
- Greenspace exposure heterogeneity increases with finer spatial scales.
- An asymmetric pattern in greenspace exposure versus coverage exists, particularly along the Heihe-Tengchong Line, with overestimation in East China and underestimation in West China.
- Recently urbanized areas exhibit superior greenspace exposure compared to older urban areas.
Conclusions:
- The study provides a novel, spatially explicit metric for multi-scale greenspace exposure.
- Findings enhance governmental capacity for quantifying environmental justice and identifying risk hotspots.
- Results support prioritizing greenspace management at supra-city scales and monitoring supply-demand balance.
