Biogenic volatile organic compound emission patterns and secondary pollutant formation potentials of dominant greening trees in Chengdu, southwest China
Biogenic volatile organic compound emission patterns and secondary pollutant formation potentials of dominant greening trees in Chengdu, southwest China
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成都优势绿化树木生物源挥发性有机化合物排放格局及二次污染物形成潜力
DOI：
10.1016/j.jes.2021.08.033
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发表时间：
2022
影响因子：
6.9
通讯作者：
Li Yunchun
中科院分区：
文献类型：
--
作者：
Liu Liping;Seyler Barnabas C;Liu Hefan;Zhou Li;Chen Dongyang;Liu Song;Yan Chang;Yang Fumo;Song Danlin;Tan Qinwen;Jia Fengju;Feng Cheng;Wang Qiuwei;Li Yunchun
作为城市生态系统的一部分，绿化树木提供了许多生态效益，但它们释放的活性生物挥发性有机化合物（BVOCs）有助于产生臭氧和二次有机气溶胶，从而损害环境空气质量。因此，有必要了解在不同的城市背景下，主要绿化树种的BVOC排放特征及其对二次污染物的相对贡献。因此，本研究利用动态围隔系统，收集中国西南成都市的7个主要绿化树种的BVOC样品。采用气相色谱/质谱联用技术分析了各树种的BVOC组分，计算了各树种的BVOC标准化排放率，评价了各树种形成二次污染物的相对潜力。我们发现每个物种排放的BVOCs的组成有明显的差异。绿榕表现出高异戊二烯排放率，为31.472 μgC/（gdw（g干重）·hr），而香樟则排放大量D-柠檬烯，为93.574 μgC/（gdw ·hr）。从BVOC的叶面积排放率来看，C.结果表明：香樟的BVOCs排放速率最高，为13782.59 μgC/（m2.hr），雪松次之，为5466.86 μgC/（m2.hr）;银杏和桂花主要排放含氧VOCs，总体排放率较低。高BVOC排放者如F. virens、绿枝隐杆藻C.紫玉兰和广玉兰对环境二次污染物的贡献潜力很大，因此应谨慎考虑未来的种植。这项研究为改善中国亚热带城市环境（如成都）的城市绿化工作提供了重要启示。
Integral to the urban ecosystem, greening trees provide many ecological benefits, but the active biogenic volatile organic compounds (BVOCs) they release contribute to the production of ozone and secondary organic aerosols, which harm ambient air quality. It is, therefore, necessary to understand the BVOC emission characteristics of dominant greening tree species and their relative contribution to secondary pollutants in various urban contexts. Consequently, this study utilized a dynamic enclosure system to collect BVOC samples of seven dominant greening tree species in urban Chengdu, Southwest China. Gas chromatography/mass spectrometry was used to analyze the BVOC components and standardized BVOC emission rates of each tree species were then calculated to assess their relative potential to form secondary pollutants. We found obvious differences in the composition of BVOCs emitted by each species. Ficus virens displayed a high isoprene emission rate at 31.472 μgC/(gdw (g dry weight) ·hr), while Cinnamomum camphora emitted high volumes of D-Limonene at 93.574 μgC/(gdw ·hr). In terms of the BVOC emission rates by leaf area, C. camphora had the highest emission rate of total BVOCs at 13,782.59 μgC/(m~2 ·hr), followed by Cedrus deodara with 5466.86 μgC/(m~2 ·hr). Ginkgo biloba and Osmanthus fragrans mainly emitted oxygenated VOCs with lower overall emission rates. The high BVOC emitters like F. virens, C. camphora, and Magnolia grandiflora have high potential for significantly contributing to environmental secondary pollutants, so should be cautiously considered for future planting. This study provides important implications for improving urban greening efforts for subtropical Chinese urban contexts, like Chengdu.