Laguerre Aurélie, Brennan Danlyn L, Starry Olyssa, Rosenstiel Todd N, Gall Elliott T
Department of Mechanical and Materials Engineering, Portland State University, Portland, OR, USA.
Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA.
Build Environ. 2023 Apr 15;234. doi: 10.1016/j.buildenv.2023.110158. Epub 2023 Mar 5.
Vegetation plays an important role in biosphere-atmosphere exchange, including emission of biogenic volatile organic compounds (BVOCs) that influence the formation of secondary pollutants. Gaps exist in our knowledge of BVOC emissions from succulent plants, which are often selected for urban greening on building roofs and walls. In this study, we characterize the CO uptake and BVOC emission of eight succulents and one moss using proton transfer reaction - time of flight - mass spectrometry in controlled laboratory experiments. CO uptake ranged 0 to 0.16 μmol [g DW (leaf dry weight)] s and net BVOC emission ranges -0.10 to 3.11 μg [g DW] h. Specific BVOCs emitted or removed varied across plants studied; methanol was the dominant BVOC emitted, and acetaldehyde had the largest removal. Isoprene and monoterpene emissions of studied plants were generally low compared to other urban trees and shrubs, ranging 0 to 0.092 μg [g DW] h and 0 to 0.44 μg [g DW] h, respectively. Calculated ozone formation potentials (OFP) of the succulents and moss range 4×10 - 4×10 g O [g DW] d. Results of this study can inform selection of plants used in urban greening. For example, on a per leaf mass basis, and have OFP lower than many plants presently classified as low OFP and may be promising candidates for greening in urban areas with ozone exceedances.
植被在生物圈 - 大气交换中起着重要作用，包括生物源挥发性有机化合物（BVOCs）的排放，这些化合物会影响二次污染物的形成。我们对多肉植物的BVOC排放了解不足，而多肉植物常被选用于建筑屋顶和墙壁的城市绿化。在本研究中，我们在可控的实验室实验中，使用质子转移反应 - 飞行时间 - 质谱法对八种多肉植物和一种苔藓的CO吸收和BVOC排放进行了表征。CO吸收范围为0至0.16 μmol [g DW（叶干重）] s，BVOC净排放范围为 - 0.10至3.11 μg [g DW] h。在所研究的植物中，排放或去除的特定BVOCs各不相同；甲醇是排放的主要BVOC，乙醛的去除量最大。与其他城市树木和灌木相比，所研究植物的异戊二烯和单萜排放通常较低，分别为0至0.092 μg [g DW] h和0至0.44 μg [g DW] h。多肉植物和苔藓的计算臭氧形成潜力（OFP）范围为4×10 - 4×10 g O [g DW] d。本研究结果可为城市绿化植物的选择提供参考。例如，以单叶质量为基础，[具体植物名称1]和[具体植物名称2]的OFP低于许多目前被归类为低OFP的植物，可能是臭氧超标城市地区绿化的有前途的候选植物。
