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Role of Roadside Trees in Alleviation Impacts of Microclimate and its Psychological Effects

An important role of roadside trees in alleviation impacts of heat and microclimate at highly stressed urban areas. Nonetheless, it has not been completely explored the psychological responses to urban streets surrounded by trees. Fifty-five subjects visited two types of roads: a control road was selected by surrounded buildings and another road surrounded by with Londonplane trees. The results show that the short-walk in roads surrounded by trees with vegetation may be effective in reducing negative symptoms of stress, and their recovery results and vitality were significantly increased. The evidence suggests that urban street trees could be an important public health resource for reduced human stress and had a significant cooling and humidifying mitigating effect on microclimate. Introduction The urban population of the worldwide has grown exponentially from 30% in 1950 to 55% of the world’s urban population in 2018. The rapid urbanization and global population growth are expected to add 2.5 billion inhabitants to the urban population by 2050, with approximately 90% of that growth taking place in Africa and Asia urbanizing faster than the remainder (United Nations, 2018). Speedy urbanization has caused serious ecological, environmental and health problems because of high rises in population, local climate change and the impact on urban heat islands and has also decreased environmental quality in many cities (Matteucci and Morello, 2009; Zhao et al., 2006;). Urban street trees as an important part of urban green infrastructure and supply urban ecosystem services (Barber and Xie, 2009). Street trees with all kinds of vegetation that give the urban environmental significantly affect through the direct cooling effect and reduction noise, removal of urban heat island and the local microclimates thermal load (Nowak et al.,2014; Shashuabar and, Hoffman, 2000; Brown, 2011). Moreover, it is noteworthy that street trees are essential part which may offer opportunities for healthy living environments and stimulating physical activity and facilitating social cohesion. (Abreu-Harbich et al., 2015). This may provide insight into the significant differences among species in their ability to reduce air and surface temperatures and to increase relation humidity by trees and vegetations (Gillner et al.,2015; Klemm etal.,2015). Recently research have shown a positive relationship between streetscape greenery and residents’ health, and found that both were associated with improvements in perceived physical health, mental health and acute health complaints by their self-reported health (Vries et al., 2013). However, little research has been conducted to identify which processes are psychological responsible for the relationship between street trees and the health benefits (Elsadek et al., 2019). This research focuses in general on roadside trees which play a part in alleviating the microclimatic impact and examine the psychological impacts of urban streets trees.