Department of Environmental Science, Faculty of Natural Resources and Environments, Malayer University, Malayer, Iran.
Department of Biology, Faculty of Sciences, Yasouj University, Yasuj, Iran.
Environ Sci Pollut Res Int. 2021 Aug;28(30):41451-41463. doi: 10.1007/s11356-021-13524-2. Epub 2021 Mar 30.
The main scope of this study is to evaluate the uptake and accumulation potential of heavy metals in unwashed and washed leaves and particulate matter (PM) in leaf surfaces plus waxes of different tree species in Isfahan city. The highest mean concentrations of Cd, Cr, and Ni in unwashed and washed leaves were detected in M. nigra, Zn and Cu in P. fraxinifolia, and Pb was related to P. orientalis. The highest and lowest mean total depositions of total particulate matter (sum of PM, PM, and PM) were found in the leaf of M. nigra (190.23 ± 23.5) and S. alba (11.9 ± 4.42 μg/cm), respectively. The maximum bio-concentration factor (BCF) of Cd, Pb, and Ni was observed in Morus nigra; Cu and Zn in Pterocarya fraxinifolia, with the BCF of Cr found in Acer negundo. Comprehensive bio-concentration index (CBCI) and metal accumulation index (MAI) were applied for comparing different tree species in HMs accumulation from soil and ambient air. The highest CBCI was measured for M. nigra (0.86), so this tree has the potential to remediate metals from the polluted soil. Higher MAI values in washed and unwashed leaves were found in S. alba (6.77 and 6.98) and M. nigra (5.93 and 5.62), demonstrating the high capability of these trees for controlling air born-metal pollution. Based on the AOM factor, M. nigra, P. fraxinifolia, U. umbraculifera, P. fraxinifolia, A. altissima, and M. alba trees had the highest ability to capture Cd, Zn, Cu, Ni, Pb, and Cr from air. So, planting these trees would be beneficial in sensitive and critical zones such as industrial and urban areas with such atmospheric pollutants.
本研究的主要范围是评估重金属在未清洗和清洗叶片以及叶片表面的颗粒物（PM）和蜡中的吸收和积累潜力，以及不同树种的颗粒物（PM）和蜡中的重金属。在未清洗和清洗叶片中，Cd、Cr 和 Ni 的最高平均浓度出现在 M. nigra 中，Zn 和 Cu 出现在 P. fraxinifolia 中，而 Pb 则与 P. orientalis 有关。总颗粒物（PM、PM 和 PM 的总和）的最高和最低总沉积量分别出现在 M. nigra 的叶片（190.23±23.5）和 S. alba 的叶片（11.9±4.42μg/cm）中。Cd、Pb 和 Ni 的最大生物浓缩因子（BCF）出现在 Morus nigra 中；Cu 和 Zn 出现在 Pterocarya fraxinifolia 中，Cr 的 BCF 出现在 Acer negundo 中。综合生物浓缩指数（CBCI）和金属积累指数（MAI）用于比较不同树种从土壤和环境空气中对重金属的积累。M. nigra 的最高 CBCI 为 0.86，因此该树种具有从污染土壤中修复金属的潜力。在清洗和未清洗的叶片中，S. alba（6.77 和 6.98）和 M. nigra（5.93 和 5.62）的 MAIs 值较高，表明这些树木具有控制空气中金属污染的高能力。根据 AOM 因子，M. nigra、P. fraxinifolia、U. umbraculifera、P. fraxinifolia、A. altissima 和 M. alba 树具有从空气中捕获 Cd、Zn、Cu、Ni、Pb 和 Cr 的最高能力。因此，在工业和城市等敏感和关键区域种植这些树木将是有益的，因为这些地区存在大气污染物。
