Feng Rundong, Wang Fuyuan, Wang Kaiyong, Wang Hongjie, Li Li
Institute of Geographic Sciences and Natural Resources Research, Key Laboratory of Regional Sustainable Development Modeling, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Institute of Geographic Sciences and Natural Resources Research, Key Laboratory of Regional Sustainable Development Modeling, Chinese Academy of Sciences, Beijing 100101, China.
Environ Int. 2021 Dec;157:106857. doi: 10.1016/j.envint.2021.106857. Epub 2021 Sep 16.
The surface urban heat island effect (SUHI) that occurs during rapid urbanization increases the health risks associated with high temperatures. Urban ecological land (UEL) has been shown to play an important role in improving urban heat stress, however, the impact of UEL interactions with the natural-anthropogenic environment on SUHI at the urban agglomeration-scale is less explored. In this study, the Google Earth Engine and GeoDetector were applied to characterize the spatiotemporal patterns of UEL and SUHI in the Guangdong-Hong Kong-Macao Greater Bay Area from 2000 to 2020 by extracting major built-up urban areas and quantifying the impacts of UEL and its interactions with the natural-anthropogenic factors on SUHI. The results show that the evolution of the UEL landscape structure exhibits clear spatiotemporal coupling with SUHI. Specifically, the UEL underwent a dispersion and degradation process in 2000-2015 and a convergence and restoration process in 2015-2020, the SUHI correspondingly transitioned from intensification and continuity to mitigation and contraction. The UEL landscape structure showed a notable impact on the SUHI reduction, and the dominance and richness of the patches explained an average of 19.95% and 16.03% of the SUHI, respectively. Moreover, the interaction between UEL and land urbanization rate and anthropogenic heat release had a dominant effect on SUHI, but this effect significantly declined from 2015 to 2020. With the implementation of ecological restoration projects, the interaction of UEL with topography rapidly increased and the SUHI gradually dominated by the joint interaction of UEL and natural-anthropogenic factors. A synthesis of the varying effects of several factors showed that the dynamic relationship between the development stages of the urban agglomeration's regional system and SUHI may conform to the Environmental Kuznets Curve. SUHI reduction strategies should therefore comprehensively optimize the rational allocation of UEL landscape structures and natural-human elements to promote the well-being of residents.
快速城市化过程中出现的地表城市热岛效应（SUHI）增加了与高温相关的健康风险。城市生态用地（UEL）已被证明在改善城市热应激方面发挥着重要作用，然而，在城市群尺度上，UEL与自然 - 人为环境的相互作用对SUHI的影响尚少被探究。在本研究中，运用谷歌地球引擎和地理探测器，通过提取主要建成区来表征2000年至2020年粤港澳大湾区UEL和SUHI的时空格局，并量化UEL及其与自然 - 人为因素的相互作用对SUHI的影响。结果表明，UEL景观结构的演变与SUHI呈现出明显的时空耦合。具体而言，UEL在2000 - 2015年经历了分散和退化过程，在2015 - 2020年经历了集聚和恢复过程，SUHI相应地从强化和连续转变为缓解和收缩。UEL景观结构对SUHI的降低有显著影响，斑块的优势度和丰富度分别解释了SUHI的19.95%和16.03%。此外，UEL与土地城市化率和人为热释放之间的相互作用对SUHI有主导作用，但这种作用在2015年至2020年显著下降。随着生态修复项目的实施，UEL与地形的相互作用迅速增加，SUHI逐渐由UEL与自然 - 人为因素的联合相互作用主导。综合多个因素的不同影响表明，城市群区域系统发展阶段与SUHI之间的动态关系可能符合环境库兹涅茨曲线。因此，SUHI降低策略应全面优化UEL景观结构和自然 - 人类要素的合理配置，以促进居民福祉。
