2020 Vol. 37, No. 1
Heat island effect leads to the deterioration of urban residential thermal environment and the consumption of large amount of energy. How to effectively alleviate the heat island effect has become an urgent problem. Vegetation can reduce air temperature and increase humidity through long-wave and short-wave radiation and transpiration. Therefore, urban greening has become an important technical means to alleviate the heat island effect. In order to continuously promote the research on the impact of vegetation on urban heat island effect, this paper reviews and summarizes the relevant studies at home and abroad from the aspects of research status, research content and research methods, existing problems and prospects. Firstly, the research progress of urban heat island effect at home and abroad is reviewed from the perspectives of research origin and observation methods. On this basis, the regulation mechanism of vegetation on urban air temperature is further analyzed, and the mechanism of vegetation cooling effect is further summarized from the perspectives of vegetation vertical structure, horizontal structure, canopy structure and vegetation remote sensing index. Among them, vegetation canopy structure contains parameters such as leaf area index, canopy width, canopy density and three-dimensional green biomass, while remote sensing index contains parameters such as normalized vegetation index, vegetation coverage and greenness vegetation index. This paper not only summarizes the research status at home and abroad, but also concludes the main problems in the current study of the cooling effect of green spaces, and puts forward suggestions for future research directions, which aims to provide references for follow-up research.