Planting trees along urban streets is one of the most important strategies to improve the urban thermal envi-ronment. However, the net impacts of urban street trees on human thermal comfort and physiological parameters are still less clear. On three similar east–west orientated streets with different degrees of tree cover—low (13％), medium (35％), and high (75％), urban microclimatic parameters and human physiological indices for six male students were simultaneously measured on three cloudless days in summer 2018. The results show that the differences in tree cover were predominant in influencing urban thermal environ-ment and comfort. The street with the highest tree cover had significantly lower physiological equivalent tempera-ture ( PET ) and more comfortable than the other two streets. The frequency of strong heat stress ( PET > 35 ℃) was 64％, 11％, and 0％, respectively, for streets with low, medium, and high tree cover. For the six male university students, human physiological indices varied greatly across the three streets with different tree cover. Systolic blood pressure, diastolic blood pressure, and pulse rate increased with decreasing tree cover. The results also suggest that urban thermal environ-ment and comfort had considerable impact on human physi-ological parameters. Our study provides reasons for urban planners to plant trees along streets to improve the thermal environment and promote urban sustainability.

Zhibin Ren;Hongbo Zhao;Yao Fu;Lu Xiao;Yulin Dong

Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China;Key Research Institute of Yellow River Civilization and Sustainable Development&Collaborative Innovation Center On Yellow River Civilization Jointly Built By Henan Province and Ministry of Education,Henan University,Kaifeng 475001,P.R.China;School of Geography and Engineering of Land Resources,Yuxi Normal University,Yuxi 653100,P.R.China

林业研究（英文版）

[1]Zhibin Ren;Hongbo Zhao;Yao Fu;Lu Xiao;Yulin Dong-.Effects of urban street trees on human thermal comfort and physiological indices: a case study in Changchun city, China)[J].林业研究（英文版）,2022(03):911-922

cloudless

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