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作者

Xia Chen;Ping Zhao;Yanting Hu;Lei Ouyang;Liwei Zhu;Guangyan Ni

来源

URBAN FORESTRY & URBAN GREENING,Vol.43,Issue1,Article 126368

语言

英文

关键字

Canopy transpiration;Transpiration cooling effect;Sap flow;Urban tree species

作者单位

Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, PR China;Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, PR China;College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China;Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, PR China;Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, PR China;College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 101408, PR China

摘要

Quantitative evaluation of canopy transpiration and its cooling effect can contribute to the selection of suitable tree species to alleviate heat island effect in urban area. To achieve this aim, we investigated the canopy transpiration and its cooling effect of three common urban tree species (Schima superba, Eucalyptus citriodora and Acacia auriculaeformis) in a subtropical city (Guangzhou) based on continuous sap flow measurement as well as environmental factors monitoring. The interspecific differences in biological attributes that impact tree transpiration and then the cooling effects were further studied. Results indicated that the strongest canopy transpiration and its cooling effect of three species were observed in the summer along with favorable environmental factors (higher soil water content (SWC)1 and photosynthetically active radiation (PAR)). Furthermore, significant interspecific differences in cooling effect of transpiration were found in our study, S. superba has the highest canopy transpiration cooling effect among three species due to its favorable bio- and hydraulic characteristics. These findings will help to promote the ecological benefits of urban forests by efficient management practices to a certain extent.