摘要
随着城市化的不断推进,建筑密度不断增加,城市可用绿地面积越来越少。垂直绿化凭借其占地面积少、生态价值高的特点受到了广泛推崇,但老旧小区外墙垂直绿化的受关注度却不高,改造过程中往往容易被忽视。以长沙市区为例,调研现有老旧小区的垂直绿化情况,得知:其中24%的老旧小区存在垂直绿化建筑,25.3%的老旧小区外墙曾经存在垂直绿化,但现已枯萎。垂直绿化形式多为攀援式,主要覆盖建筑的东西山墙,高度集中在1~5层,主要植物种类为地锦和凌霄。在夏季极端炎热气候环境,选择两组存在垂直绿化的墙面和相应的对照墙面进行红外热成像。得出结论:垂直绿化可以减小外墙面温度上升的速度和幅度。同一类型垂直绿化对于墙面的降温效果主要受到太阳辐射影响,光照强度未达到光饱和点时,垂直绿化墙面的降温效果与其受到的太阳总辐射照度呈正相关。
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.
作者
肖敏
陈染岐
Xiao Min;Chen Ranqi
出处
《中外建筑》
2024年第5期62-67,共6页
Chinese & Overseas Architecture
关键词
老旧小区
垂直绿化
攀援植物
红外热像法
生态价值
old residential areas
vertical greening
climbing plants
infrared thermography
ecological value
