屋顶栽培藤本蔬菜绿化降温试验

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℃。

Greening and Temperature Cooling Test for Cultivating Lianoid Vegetables on Roof

Roof thermal radiation is an important reason causing urban thermal environment effect, and the roof greening is an effective way to reduce the thermal radiation. This study selects the balsam pear, lentils and towel gourd as test materials and adopts box-type cultivation method on the roof with steel mesh stent to respectively observe their growth adaptability and compare their temperature cooling effect for roof. The results showed that before middle July, the growth of sponge gourd and bitter melon was vigorous, but gradually declined with increasing temperature after middle July, but lentils had strong ability to resist high temperature, so it can maintain a strong growth state until met the frost; for greening and temperature cooling effect, before middle July, there was no significant difference among three kinds of vegetable, but lentils was obviously better than sponge gourd and bitter after middle July. Cultivating lianoid vegetables on roof has significant temperature cooling effect, the higher the temperature is, the temperature cooling effect the more obvious, especially at 12：00, the temperature cooling range was the largest by 8.7℃.