Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, I.R, Iran.
Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, I.R, Iran.
Environ Sci Pollut Res Int. 2022 Feb;29(10):14121-14130. doi: 10.1007/s11356-021-16750-w. Epub 2021 Oct 3.
In recent years, green roofs have become the subject of increasing interest because of their good aesthetic qualities, energy conservation, and ability to reduce thermal island effect and absorb greenhouse gases, especially carbon dioxide (CO). Given the typically significant carbon emission of construction activities, adding any extra component to a structure increases the amount of carbon to be released during the execution stage. This also applies to green roofs, which require more materials and more extensive construction activities than traditional roofs. However, plants of green roofs absorb substantial amounts of CO during their lifetime, thus leaving both short- and long-term positive impacts on the building's carbon footprint. This study investigated the short- and long-term effects of green roofs on carbon footprint, as compared to conventional roofs. For this investigation, the CO uptake of eight plant species with suitable drought- and cold-resistant properties was measured by infrared gas analysis (IRGA), and the effect of green roof on the building's carbon footprint was analyzed using the software Design Builder. The results showed that building a green roof instead of a traditional roof increases the carbon emission of the construction process by 4.6 kg/m of roof area. Investigations showed that, under high light intensities (1500-2000 μmol/m s), Sedum acre L. has the best performance in compensating the extra carbon emission imposed on the construction process (in 264 days only). Under low light intensities (1000-1500 μmol/m s), Frankenia laevis showed the best increase in the amount of carbon uptake (2.27 kg/m year).
近年来，绿色屋顶因其良好的美学品质、节能以及减少热岛效应和吸收温室气体（尤其是二氧化碳）的能力而成为人们日益关注的焦点。考虑到建筑活动通常会产生大量的碳排放，在结构中添加任何额外的组件都会增加在执行阶段释放的碳量。这同样适用于绿色屋顶，与传统屋顶相比，绿色屋顶需要更多的材料和更广泛的施工活动。然而，绿色屋顶上的植物在其生命周期内会吸收大量的二氧化碳，因此对建筑物的碳足迹会产生短期和长期的积极影响。本研究调查了与传统屋顶相比，绿色屋顶对碳足迹的短期和长期影响。为此，通过红外气体分析（IRGA）测量了八种具有适当耐旱和耐寒特性的植物物种的 CO 吸收量，并使用 Design Builder 软件分析了绿色屋顶对建筑物碳足迹的影响。结果表明，建造绿色屋顶而非传统屋顶会使屋顶面积每平方米的建筑过程碳排放增加 4.6 公斤。研究表明，在高光强（1500-2000 μmol/m s）下，景天属植物表现出最好的补偿建筑过程中额外碳排放的能力（仅在 264 天内）。在低光强（1000-1500 μmol/m s）下，弗兰克尼亚属植物表现出最大的碳吸收量增加（每年 2.27 公斤/平方米）。
