被钢筋水泥包围的城市会造成城市板结。城市板结会产生一些弊端,如气温较高、污染较重、噪音大等。为此,研究人员和城市管理部门一直在探索如何利用城市的建筑群进行绿化,例如利用城市建筑的屋顶栽种植物。如何利用城市屋顶有的人认为,可以把城市屋顶涂色,以达到避光避热和装饰城市的作用,而另一些人则积极倡导利用屋顶来栽种花草和植物,以扩大城市的绿化面积。在国内城市中,这两种做法都有。前不久,南京市就决定对城市房屋屋顶重新涂色。 Cities surrounded by reinforced concrete can cause urban compaction. Urban compaction will have some drawbacks, such as high temperatures, heavy pollution, noise and so on. To this end, researchers and city authorities have been exploring ways to green the buildings of the city, for example by planting roofs of urban buildings. How to Make Use of the Roofs of the City Some people think that the roofs of cities can be colored to achieve the effect of avoiding darkness and heat and adorning the city while others advocate the use of rooftops to plant flowers and plants in order to expand the green area of ​​the city. In domestic cities, there are both ways. Not long ago, Nanjing decided to re-paint the roofs of urban houses.