西部人居环境学刊2025，Vol.40Issue(4)：1-7,7.DOI:10.13791/j.cnki.hsfwest.20250414005
热舒适不平等性的城乡梯度与绿地调节机制研究
Urban-rural gradient of thermal comfort inequality and its associations with green spaces:The case of Chengdu
摘要
Abstract
With the intensification of climate change and the escalating urban thermal environment crisis,residents'exposure to heat,thermal comfort,and their spatial inequality have become increasingly prominent.Addressing thermal comfort inequality has become a critical issue for urban spatial planning and climate adaptation strategies.This study investigates the spatial patterns of thermal comfort and the underlying mechanisms of spatial inequality in relation to urban green space characteristics,using the central urban area of Chengdu,China,as a case study.In this study,we constructed an urban-rural gradient of thermal comfort inequality using the concentric ring method,centered on Tianfu Square,and integrated three key dimensions(thermal comfort,population distribution,and inequality)into a comprehensive analytical framework.Following the existing literature,we measured thermal comfort using a land surface temperature-based thermal comfort index,which assumes that higher LST values correlate with reduced comfort and increased heat stress.In addition,based on high-resolution census grid data,a population-weighted approach was employed to account for the interaction between thermal comfort and population distribution.The Gini coefficient was used to evaluate the degree of inequality,capturing spatial disparities in thermal comfort across different census grids.The results reveal a gradient structure in Chengdu's urban heat environment.First,thermal comfort shows a general upward trend along the urban-rural corridor.Residents in peripheral areas tend to have higher thermal comfort than those in inner-city areas.Notably,areas located around 7 km and 13 km from the city center,corresponding approximately to the Third Ring Road and Outer Greenbelt(Fourth Ring Road),demonstrate localized peaks in thermal comfort,suggesting the influence of both built environment intensity and ecological infrastructure.Second,thermal comfort inequality does not follow a simple trend but presents a non-linear distribution.Inner-city zones(1-4 km from the center)have relatively low inequality levels(Gini coefficient<0.4),whereas suburban transitional zones between 8-25 km exhibit markedly higher inequality(Gini coefficient>0.6),followed by a gradual decline in inequality beyond this range.This observation suggests that the central areas may be more uniformly affected by the thermal environment,whereas the urban-rural transition zones exhibit greater variability,which may be attributed to differences in urban greening and socioeconomic development levels.To further understand the relationship between green space and thermal comfort inequality,we introduced three green space characteristics,including NDVI,canopy height,and vegetation diversity.A ridge regression model was employed to address collinearity among explanatory variables and ensure the robustness of the estimation.The model demonstrates strong explanatory power(adjusted R2=0.605),and a significant relationship was observed between green spaces and thermal comfort inequality.The results suggest that all three green space indicators are negatively associated with thermal comfort inequality,with vegetation diversity exerting the most significant mitigating effect.This outcome implies that not only the amount but also the structure and composition of urban green spaces play critical roles in promoting thermal equity.Furthermore,areas with higher land-use mix and population density tend to exhibit lower inequality,underscoring the importance of compact and multifunctional urban development in mitigating thermal injustice.From the perspective of underlying mechanisms,the study reveals that urban green space characteristics,particularly vegetation diversity,canopy height,and NDVI,play a significant role in mitigating spatial inequality in thermal comfort.We suggested three key mechanisms:1)climate regulation,whereby diverse vegetation types enhance evapotranspiration and shading,thereby reducing local heat stress;2)spatial coverage,as multilayered green infrastructure expands the spatial reach of cooling services and reduces concentrated exposure to high temperatures;3)social buffering,where equitably distributed green spaces are more likely to benefit vulnerable communities and enhance their capacity to cope with thermal risks.These findings underscore the importance of integrating both ecological functionality and equity considerations in green space planning to improve urban thermal resilience and promote environmental justice.Based on these findings,we proposed a three-tiered planning strategy to improve urban thermal equity:1)prioritizing targeted interventions in high-risk,high-inequality zones,especially within the transitional urban belt;2)enhancing the diversity and structural complexity of green spaces to maximize climate-regulating and distributive benefits;3)promoting equitable spatial distribution of cooling resources,particularly in areas inhabited by vulnerable populations.This study not only provides theoretical support for understanding the interaction between urban thermal environment gradients but also offers practical insights for promoting environmental justice and sustainable urban development.关键词
热舒适/空间不平等/环境正义/城市绿地/城乡梯度/热适应策略Key words
thermal comfort/spatial inequality/environmental justice/urban green space/urban-rural gradient/thermal adaptation strategies分类
建筑与水利引用本文复制引用
陈杰,贺斌,刘盛,姜宇逍,杨林川..热舒适不平等性的城乡梯度与绿地调节机制研究[J].西部人居环境学刊,2025,40(4):1-7,7.基金项目
中央高校基本科研业务费(2682025CX123) （2682025CX123）
成都市哲学社会科学研究基地人与自然和谐共生的美丽城市建设研究中心2025年度一般项目(MLCS2025YB01) （MLCS2025YB01）
