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Isoprenoid and aromatic compound emissions in relation to leaf structure, plant growth form and species ecology in 45 East-Asian urban subtropical woody species
Urban Forestry & Urban Greening ( IF 6.4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ufug.2020.126705
Yali Yuan , Zhihong Sun , Astrid Kännaste , Ming Guo , Guomo Zhou , Ülo Niinemets

Abstract Volatile emissions from urban parks and forests can significantly contribute to local and regional air quality due to biogenic volatile organic compound (BVOC) emissions from vegetation, but the source strength of BVOC of urban habitats is difficult to assess due to a complex mixture of ornamental species with widely varying leaf and whole plant characteristics and taxonomy. Furthermore, there is very limited information of BVOC emission characteristics of subtropical urban sites and overall lack of information of emission capacity of aromatic compounds that are often left out in BVOC screening studies. We investigated BVOC emissions from healthy mature leaves of 45 East-Asian subtropical wide-spread broad-leaved ornamental woody species with contrasting leaf structure and longevity (evergreen vs. deciduous), growth form (shrub vs. tree) and temperature, light and water requirements to characterize the overall frequency of volatile emissions in relation to species characteristics. BVOC emissions were characterized by the share of each compound and compound class in total emissions, absolute emission rates and frequency of emission of different volatiles. Isoprene contributed the greatest share of total emissions (42.6 %), followed by monoterpenes (29.7 %), sesquiterpenes (13.8 %) and aromatic compounds (7.5 %). However, isoprene was emitted only in 20 % of species, whereas the other volatile compound classes were emitted in the majority of species (35.6 %–95.6 %). The overall emission rates were relatively low for isoprene (up to 1.7 nmol m−2 s-1 and for aromatics (up to 0.2 nmol m−2 s-1) and moderately high for terpenes (up to 0.8 nmol m−2 s-1 for both mono- and sesquiterpenes). Isoprenoid and aromatic compound emissions were positively correlated across the species. Multivariate analyses indicated that species taxonomy poorly explained the emission patterns, but for most compound classes, the emissions were higher in species with structurally more robust leaves (higher leaf dry mass per unit area, and lower leaf water content) and in species capable of growing in environments with higher light, higher temperature and lower water availability. In addition, isoprene emissions were more prevalent in deciduous species and aromatic emissions in evergreens. Overall, the study emphasizes that apart from isoprene, urban ornamentals constitute a large source of monoterpenes, sesquiterpenes and aromatic compounds and that planting of stress resistant species that require less maintenance might enhance BVOC emissions.

中文翻译:

类异戊二烯和芳香族化合物排放与 45 种东亚城市亚热带木本植物叶片结构、植物生长形态和物种生态的关系

摘要 城市公园和森林的挥发性有机物排放由于植被中的生物挥发性有机化合物 (BVOC) 排放而对当地和区域空气质量有显着影响,但由于观赏植物的复杂混合,城市栖息地的 BVOC 源强度难以评估。具有广泛变化的叶和全植物特征和分类的物种。此外,亚热带城市站点的 BVOC 排放特征信息非常有限,并且总体上缺乏 BVOC 筛选研究中经常遗漏的芳香族化合物排放能力信息。我们调查了 45 种东亚亚热带广布阔叶观赏木本植物健康成熟叶子的 BVOC 排放,这些木本植物的叶子结构和寿命(常绿与落叶)、生长形式(灌木与落叶)形成鲜明对比。树)和温度、光照和水的要求,以表征与物种特征相关的挥发性排放的总体频率。BVOC 排放的特征在于每种化合物和化合物类别在总排放中的份额、绝对排放率和不同挥发物的排放频率。异戊二烯占总排放量的最大份额 (42.6%),其次是单萜 (29.7%)、倍半萜 (13.8%) 和芳香族化合物 (7.5%)。然而,异戊二烯仅在 20% 的物种中排放,而其他挥发性化合物类别在大多数物种中排放(35.6%–95.6%)。异戊二烯(高达 1.7 nmol m-2 s-1 和芳烃(高达 0.2 nmol m-2 s-1))的总体排放率相对较低,而萜烯(高达 0. 8 nmol m-2 s-1 对于单萜和倍半萜)。异戊二烯和芳香族化合物的排放在整个物种中呈正相关。多变量分析表明,物种分类无法很好地解释排放模式,但对于大多数复合类别,具有结构更健壮的叶子的物种(单位面积的叶子干重更高,叶片含水量更低)和能够生长的物种的排放量更高在光照较高、温度较高和可用水量较低的环境中。此外,异戊二烯排放在常绿植物中的落叶物种和芳香排放中更为普遍。总体而言,该研究强调,除了异戊二烯外,城市观赏植物也是单萜的重要来源,
更新日期:2020-08-01
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