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屋顶热辐射是导致城市热环境效应产生的一个重要原因,屋顶绿化是减轻热辐射的一项有效措施。选用苦瓜、扁豆和丝瓜作试验材料,在屋顶上采用箱式栽培方式,搭建钢丝网作支架,分别观测其生长适应性,并比较屋面降温效果。结果表明:7月中旬前丝瓜与苦瓜生长旺盛,7月中旬后随着温度升高而逐渐衰退,而扁豆具有较强的抗高温能力,一直保持旺盛生长状态,直到遇霜枯死;绿化降温效果7月中旬之前3种蔬菜无明显差异,7月中旬以后扁豆明显优于丝瓜和苦瓜。屋顶栽培藤本蔬菜降温效果显著,气温越高降温越明显,特别是在中午12:00降温幅度最大,达到8.7℃。
Rooftop heat radiation is one of the important reasons leading to the urban thermal environment effect. Green roof is an effective measure to reduce heat radiation. Selection of bitter melon, lentils and loofah as test materials, the use of box-roof cultivation on the way to build steel mesh for the stent were observed growth adaptability, and compare the roof cooling effect. The results showed that in the middle of July, the loofah and bitter gourd grew vigorously, and then gradually declined with the increase of temperature in mid July, while the lentil had a strong ability of resisting high temperature and maintained vigorous growth till the frost died. The greening and cooling effect Before mid-July three kinds of vegetables no significant difference, mid-July lentils significantly better than loofah and bitter melon. The cooling effect of the vine on the roof is remarkable. The higher the temperature is, the more obvious it is to cool down, especially at 12:00 noon, reaching the maximum of 8.7 ℃.