School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, People's Republic of China.
Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada.
Environ Sci Pollut Res Int. 2020 Oct;27(30):37614-37625. doi: 10.1007/s11356-020-09768-z. Epub 2020 Jun 30.
The characteristics of land use/land cover (LULC) types may affect the thermal environment of urban zones. In this study, the urban zones of the Pearl River Delta (PRD) were examined to explore the spatiotemporal variations in land surface temperature (LST) from 2001 to 2017, as well as the relationships between LST and various influencing factors. Landscape pattern analysis was undertaken to explore the correlation between patch metrics and LST with resolutions from 100 m to 1 km. The results showed that (1) the high-temperature zones were mainly distributed on built-up land; the area of LST hot spots increased from 16% (2001) to 23% (2017). (2) The mean LST of each LULC type was calculated, indicating that the temperature of forestland was more than 5 °C lower than that of built-up land. (3) The landscape patterns of different land use types exhibited various effects on LST in terms of magnitude and importance. Considering the significance of the landscape indexes, it is necessary to avoid a large-scale layout of a single built-up land type when planning an urban environment. It is thus recommended that multiple contiguous forestlands be planned to mitigate urban heat island (UHI) effects. Furthermore, the landscape patterns and structure of different LULC types have various effects on LST and need to be explored in fine detail. This study helped reveal the impact of different LULC types on LST and provides urban planners in the PRD with optional schemes for mitigating the impacts of urbanization on the UHI.
土地利用/土地覆盖（LULC）类型的特征可能会影响城市区域的热环境。本研究以珠江三角洲（PRD）的城市区域为研究对象，探讨了 2001 年至 2017 年期间地表温度（LST）的时空变化，以及 LST 与各种影响因素之间的关系。通过景观格局分析，探讨了斑块指标与 LST 之间的相关性，分辨率从 100m 到 1km。结果表明：（1）高温区主要分布在建设用地；LST 热点面积从 2001 年的 16%增加到 2017 年的 23%。（2）计算了每种 LULC 类型的平均 LST，表明林地温度比建设用地低 5°C 以上。（3）不同土地利用类型的景观格局对 LST 的影响在幅度和重要性方面表现出不同的效果。考虑到景观指数的重要性，在规划城市环境时，有必要避免大规模布局单一的建设用地类型。因此，建议规划多个连续的林地，以减轻城市热岛（UHI）效应。此外，不同 LULC 类型的景观格局和结构对 LST 有不同的影响，需要进行详细的探讨。本研究有助于揭示不同 LULC 类型对 LST 的影响，为 PRD 的城市规划者提供了缓解城市化对 UHI 影响的可选方案。
