Study on Mitigation of Urban Heat Island by Greening at Residential Areas in Shanghai

People living and working in urban residential area have been greatly threatened by urban heat island, a thermal environment effect accompanying large-scale urban construction. The most efficient, economical and sustainable developmental solution is to develop greening construction reasonably. The results show that different cooling effect is led by different species and types of plants, plant arrangement, green land ventilation condition and vegetation quantity. The research indicates that the single plant with paper-like leaf contributes the high efficiency of reducing heat, the arbor coverage ratio of green patch decides the efficiency to reduce heat, and tall arbores reduce more temperature than the lawn by 2.2℃, and climbing greening will reduce the room temperature from 0.5℃ to 5℃ . The average air temperature within the residential area positively relates to the proportion of arbores, the coverage ratio of greening plants, the area of the biggest patch, and negatively relates to the fragmentation degree for the greening patch. The relationship between tridimensional greening quantity, per greening quantity and urban heat island is discussed in the research for the first time.