Impact factor assessment of the uptake and accumulation of polycyclic aromatic hydrocarbons by plant leaves: Morphological characteristics have the greatest impact.
Impact factor assessment of the uptake and accumulation of polycyclic aromatic hydrocarbons by plant leaves: Morphological characteristics have the greatest impact.
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DOI：
10.1016/j.scitotenv.2018.10.357
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
Lu Tian;Shan Yin;Ying-ge Ma;Hongzhang Kang;Xuyi Zhang;Haoxin Tan;Hengyu Meng;Chunjiang Liu
中科院分区：
文献类型：
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作者：
Lu Tian;Shan Yin;Ying-ge Ma;Hongzhang Kang;Xuyi Zhang;Haoxin Tan;Hengyu Meng;Chunjiang Liu
多环芳烃（PAHs）对生物体具有毒性、致畸性、致突变性和致癌性。植物因其广泛的表面分布和对大气污染物的特异性反应，可以作为污染物的生物指示剂和生物修复剂。然而，不同的植物表现出显着的差异，他们的能力积累多环芳烃。目前，研究主要集中在叶片形态和生理特性的影响，很少有研究评估的影响，多环芳烃积累的叶表面。本研究旨在探讨影响植物叶片吸收和积累多环芳烃的因素。选取上海市8种常见树种，采用超临界流体萃取技术测定其叶片中多环芳烃的含量。具体测量叶面积，宽度/长度，蜡质含量，气孔密度的形态和生理特征的指数;表面粗糙度，表面自由能，极性成分，分散成分被编译成一个吸附性能指数。采用主成分分析（PCA）和典型相关分析（CCA）研究了不同叶片性状对多环芳烃积累的影响。结果表明，不同树种的土壤中多环芳烃的平均含量在300 ~ 2000 ng·g-1之间，不同苯环的比例存在显著差异。叶片形态和生理特性的影响比表面吸附更为显著。叶片形态特征与蜡质含量呈显著负相关，与表面吸附量相关不显著。低分子量的多环芳烃主要受形态特征的影响，而中，高分子量的多环芳烃的蜡含量和吸附的影响。研究结果为建立可靠的植物大气监测系统和筛选对多环芳烃吸附能力强的树种提供了理论依据。
Polycyclic aromatic hydrocarbons (PAHs) have toxic, teratogenic, mutagenic and carcinogenic effects on living organisms. Plants can function as pollutant bioindicators and bioaccumulators due to their wide surface distribution and specific responses to atmospheric pollutants. However, various plants exhibit significant differences in their capacities to accumulate PAHs. At present, research has mainly focused on the effects of leaf morphology and physiological characteristics, and few studies have evaluated the effects of the leaf surface on PAH accumulation. We aimed to assess the factors impacting the uptake and accumulation of PAHs by leaves. We selected 8 common tree species in Shanghai, China, and used supercritical fluid extraction technology to determine the content of PAHs in their leaves. Specific measurements of leaf area, width/length, wax content, and stomatal density were applied to index the morphological and physiological characteristics; surface roughness, surface free energy, polar components, and dispersion components were compiled into an adsorption performance index. Principal component analysis (PCA) and canonical correlation analysis (CCA) were used to assess the effects of different leaf characteristics on PAH accumulation. We found that the mean concentrations of ΣPAHs ranged from 300 to 2000 ng·g−1and that the proportions of different benzene rings were significantly different among the different tree species. Leaf morphology and physiological characteristics had more significant effects compared to surface adsorption. CCA showed a significant negative correlation between leaf morphological characteristics and wax content, but had no significant correlation with surface adsorption. Low-molecular-weight PAHs were found to be mainly affected by the morphological characteristics, while medium- and high-molecular-weight PAHs were influenced by wax content and adsorption. Our conclusions provide a theoretical basis for the establishment of a reliable plant atmosphere-monitoring system and a method for screening tree species with strong PAH adsorption capacity.