兰州市屋顶绿化3种植物配置模式生态效益研究

Study on ecological benefits of roof greening with three plant combination patterns in Lanzhou

为研究屋顶绿化的生态效益,以兰州市御景东方住宅小区活动中心三楼绿化屋顶为研究对象,以无绿化植物的裸露屋顶为对照,进行乔-灌、灌-草和地被3种植物配置模式的气温、空气相对湿度和空气负氧离子含量测定。结果表明:与对照相比,乔-灌和灌-草配置模式均有极显著的降温效果,平均降低温度为乔-灌(10.36℃)>灌-草(6.27℃)>地被(3.92℃),乔-灌和地被两种配置模式增湿效果没有显著差异,而灌-草配置模式能显著提高环境的相对湿度,增湿幅度灌-草(3.15%)>乔-灌(2.81%)>地被(2.80%),乔-灌和地被配置模式有显著地增加空气负氧离子的效果。空气负氧离子分子浓度为:乔-灌(63.42个/cm^3)>灌-草(52.13个/cm^3)>地被(37.59个/cm^3)>对照(33.98个/cm^3)。

The ecological benefits of roof greening with tree-shrub,shrub-grass and ground-cover plant patterns were studied in Lanzhou.The temperature,relative air humidity and air negative oxygen ions under different patterns were determined.The results showed that tree-shrub and shrub-grass pattern had extremely significant cooling effect,and cooling effect ranking was tree-shrub(10.36℃)>shrub-grass(6.27℃)>ground-cover plant(3.92℃).No significant difference in humidification effect was found between tree-shrub and ground-cover,and the shrub-grass pattern could significantly increase the relative humidity of the environment.The humidification ranking was shrub-grass(3.15%)>tree-shrub(2.81%)>ground-cover plant(2.80%).Tree-shrub and ground-cover plant patterns showed significant improving effect on air negative oxygen ions,and the ranking for improving air negative oxygen ions was tree-shrub(63.42 ions/cm^3)>shrub-grass(52.13 ions/cm^3)>ground-cover plant(37.59 ions/cm^3)>CK(33.98 ions/cm^3).