西安市几种不同屋顶绿化形式的降温增湿效益

The Cooling and Humidifying Efficiency of Different Roof Greening Form in Xi'an City

选择西安市某绿化屋顶为研究对象,测试草地+灌木、草地+乔木及藤蔓类3种不同植物群落的绿化形式与无绿化裸屋面的环境温度和相对湿度,根据平均温度与平均湿度、降温程度与增湿程度、降温率与增湿率比较了3种绿化形式的降温增湿效益。测试数据显示,3种绿化形式均有一定的降温增湿效果,其中藤蔓类绿化效果最好。它可以降低平均温度3.71℃,降温程度范围为2.17℃-4.52℃,降温率达10.4%;提高平均相对湿度5.47%,增湿程度范围为3.22%-7.5%,增湿率达16.6%。同时通过方差检验和SPSS的LSD多重比较检验得到:草地+灌木和草地+乔木两种绿化形式相比,其降温和增湿效果均没有显著性差异;和对照组相比,3种绿化形式均有显著的降温效果,其中藤蔓类绿化的降温效果最好;与对照组相比,只有藤蔓类绿化形式的相对湿度有显著性差异,有较好的增湿效益。

Choose one green roof in Xi’an as the research object, and this paper tests the lawn and shrubs, grass and trees, and vines 3 kinds of greening forms and naked roof environment temperature and relative humidity. According to the average temperature and average degree of humidity, degree of cooling and humidification, cooling rate and humidifying rate, compare cooling humidifying efficiency of the different plant community greening forms. Test data shows that 3 kinds of greening form uniform all have cooling humidifying efficiency. The vines greening works best. It can reduce the average temperature of 3.71℃, and range 2.17 ℃to 4.52 ℃of the cooling degree and cooling rate was 10.4%; Improve Average relative humidity 5.47%, humidifying level range from 3.22% to 7.5%, humidifying rate was 16.6%. Variance and SPSS LSD multiple comparison test show compared two landscaping forms of grass and shrubs, grass and trees, the cooling and humidifying effects were not significant difference; Compared with control group, 3 kinds of greening form have the significant cooling effect and the vine plant cooling effect is best; Compared with control group, the relative humidity of the vines greening form only has significant difference and good humidifying efficiency.