Abstract：
Ensuring residents\' equal access to high quality urban greenspace is vital for urban environmental justice and sustainable urban development. However, most previous studies have mainly focused on greenspace quantity, overlooking its quality. Moreover, the national-level spatial distribution pattern of residential greenspace exposure (RGE) within urban areas remains unclear. Here, we have improved the existing RGE assessment framework by integrating both the quality and quantity of urban greenspace to evaluate RGE and its associated inequality across 119,692 blocks in 334 Chinese cities in 2020. We find that the spatial distribution pattern of RGE varies with urban size. Large cities exhibit a distinct clustering of low RGE in their central areas, whereas small cities tend to show a pronounced clustering of high RGE in the central areas. RGE in Chinese cities indicates extensive inequality, as the average RGE of high-exposed people is nearly four times greater than that of low-exposed people. Moreover, residents in larger cities are more prone to experiencing greater inequalities compared to those in smaller cities. We also find that the landscape metrics (i.e., connectance index and mean Euclidean nearest-neighbor distance) of greenspace possess a strong explanatory power (R2 = 0.431) for the observed inequality. Our study underscores the importance of optimizing the landscape structure of urban greenspace and enhancing equality in the quality of greenspace. These findings provide novel insights for urban greenspace planning and promoting urban environmental justice.
摘要：
确保居民平等获得高质量的城市绿地对于城市环境正义和城市可持续发展至关重要。然而,以前的研究主要集中在绿地数量上，俯瞰它的质量。此外，城市地区住宅绿地暴露（RGE）的国家级空间分布格局尚不清楚。这里,我们通过整合城市绿地的质量和数量来改进现有的RGE评估框架，以评估2020年中国334个城市119,692个街区的RGE及其相关不平等。我们发现RGE的空间分布格局随城市规模而变化。大城市在其中部地区表现出明显的低RGE集群，而小城市往往在中部地区表现出明显的高RGE集群。中国城市的RGE表明了广泛的不平等，因为高暴露人群的平均RGE是低暴露人群的近四倍。此外，与小城市相比，大城市的居民更容易经历更大的不平等。我们还发现景观指标(即，绿色空间的连通指数和平均欧氏最近邻距离）对观察到的不等式具有很强的解释力（R2=0.431）。我们的研究强调了优化城市绿地景观结构和提高绿地质量平等的重要性。这些发现为城市绿地规划和促进城市环境正义提供了新的见解。
