Analysis of Existing Forms and Ecological Value of Vertical Greening in Old Residential Areas of Changsha City
With the continuous progress of urbanization,the increasing building density has led to a reduction in available green spaces in cities.Vertical greening has gained wide recognition due to its small footprint and high ecological value.However,vertical greening of exterior walls in old neighborhoods often receives little attention and is easily overlooked during the renovation process.Taking Changsha city as an example,the vertical greening situation in existing old neighborhoods was investigated.It is found that 24%of the old neighborhoods has vertical greening structures,while 25.3%of the old neighborhoods previously had vertical greening on their exterior walls but now it has withered.Vertical greening in the form of climbing plants mainly covers the east and west walls of buildings,with a concentration in the height range of 1 to 5 floors.The main plant species are ivy(Parthenocissus tricuspidate)and trumpet vine(Campsis grandiflora).In the extremely hot climatic conditions of summer,two groups of walls with vertical greening and their corresponding control walls were selected for infrared thermal imaging.The results showed that vertical greening can slow down the rate and magnitude of temperature increase on the exterior walls,and the measured cooling effect reached 1.33℃.The cooling effect of the same type of vertical greening on the walls is primarily influenced by solar radiation.When the light intensity has not reached the light saturation point,the cooling effect of vertical greening on the walls is positively correlated with the total solar radiation received by the walls.
old residential areasvertical greeningclimbing plantsinfrared thermographyecological value
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