School of Horticulture and Landscape Architecture, Henan Institute of Science and Technology, Xinxiang, China.
Henan Province Engineering Research Center of Horticultural Plant Resource Utilization and Germplasm Enhancement, Xinxiang, China.
PLoS One. 2022 Aug 10;17(8):e0272626. doi: 10.1371/journal.pone.0272626. eCollection 2022.
Urban heat islands are major factors hindering the quality of present-day urban habitats. The ongoing acceleration of the worldwide urbanization process is leading to an exacerbation of the urban heat island effect; however, urban forestry can mitigate it. For a sustainable urban development, it is particularly important to evaluate the dual effect of both factors on the urban heat island phenomenon. In this study, we focused on Zhengzhou City (China), at the center of the Central Plains Forest City Cluster. The spatial and temporal evolutions of the local urban heat island and vegetation coverage were measured from Landsat 5 and Landsat 8 remote sensing images taken between 2006-2020 and the effects of urban construction and urban forestry on the urban heat island effect were evaluated. The results showed that, in the past 15 years, the high-temperature zone in the urban area of Zhengzhou City has gradually spread from its center to surrounding areas. Within the same period, the whole urban heat island has deteriorated and gradually improved: its area increased by 138.72 km2 between 2006-2014 and decreased by 135.66 km2 between 2014-2020. Notably, the development of vegetation coverage occurred consistently with the improvement of the heat island. A quantitative analysis of the relationship between urban construction, the urban forest, and the urban heat island has shown that factors like population density (representing urban construction), urban planning, and vegetation cover (representing the urban forest) all have an impact on the urban heat island. Based on the dynamic changes of the urban heat island in the urban area of Zhengzhou City between 2006-2020, we conclude that urban forest construction strategies are beginning to bear fruit. Overall, the findings of this study provide a theoretical basis for future urban construction and urban forest construction plans; moreover, they can support landscape pattern optimization and urban heat island mitigation.
城市热岛是阻碍当今城市人居环境质量的主要因素。全球城市化进程的持续加速导致城市热岛效应加剧；然而，城市林业可以缓解这一问题。为了实现可持续的城市发展，评估这两个因素对城市热岛现象的双重影响尤为重要。在本研究中，我们以中原森林城市群的中心城市——郑州市为研究对象。从 2006 年至 2020 年期间获取的 Landsat 5 和 Landsat 8 遥感图像中，测量了当地城市热岛和植被覆盖的时空演变，并评估了城市建设和城市林业对城市热岛效应的影响。结果表明，在过去的 15 年中，郑州市城区高温区逐渐从中心向周边地区扩散。同期，整个城市热岛逐渐恶化并有所改善：其面积在 2006-2014 年间增加了 138.72km²，在 2014-2020 年间减少了 135.66km²。值得注意的是，植被覆盖的发展与热岛的改善一致。对城市建设、城市森林与城市热岛关系的定量分析表明，人口密度（代表城市建设）、城市规划和植被覆盖（代表城市森林）等因素都对城市热岛有影响。基于 2006-2020 年郑州市城区城市热岛的动态变化，我们得出城市森林建设策略开始取得成效的结论。总的来说，本研究的结果为未来城市建设和城市森林建设规划提供了理论依据；此外，它们还可以支持景观格局优化和城市热岛缓解。
