屋顶绿化对空气中二氧化碳含量的影响

摘要

This paper analyzed the absorption and reduced emission of carbon dioxide ( CO2) by Sedum lineare greenroofs,which are widely used in China. It is concluded that there is no obvious influence on the amount of CO, in the air if the life cycle of a single plant is taken into account. The CO2 fixed by plant bodies and the reduced CO2 emission due to improved building energy efficiency are also negligible when compared with the CO2 emission in cities.%以国内最常见的佛甲草植被屋顶为例,研究了屋顶绿化对二氧化碳的吸收和减排效果.分析发现,考虑单个植物体的整个生命周期,屋顶绿化对空气中的二氧化碳含量几乎没有影响.若保持植被屋顶较高的生物量,则可以通过植物本身固定碳元素；植被屋顶还能通过降低建筑的能耗来间接减少二氧化碳的排放.后两种途径均能达到一定的效果,但与城市的二氧化碳排放量相比则微不足道.