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以悬铃木、国槐、白蜡、广玉兰、女贞、石楠、大叶黄杨、小叶女贞、海桐、雪松、圆柏、龙柏12种新乡市道路绿化树木为试材,对新乡市12种道路绿化树木叶片硫、铅和铜的含量进行分析,研究了绿化树木叶片富集大气污染物的差异性。结果表明:除广玉兰和女贞叶片硫含量秋季比春季略有减少外,所有供试绿化树种叶片的硫、铅、铜含量随春、秋季节变化呈递增趋势,硫、铅和铜的递增范围分别为18%~216%、4%~385%和27%~334%;与清洁区相比较而言,污染区域所供试的所有绿化树木叶片污染物硫、铅和铜的含量都较高,其变化幅度范围分别为9%~223%、37%~390%和85%~374%。根据绿化树木叶片污染物含量的综合分析,将其分成3类,第1类以雪松和广玉兰为代表,叶片中含污染物硫、铅、铜的量较高;第2类包括白蜡、女贞、悬铃木和大叶黄杨,叶片中3种污染物含量居中;龙柏、国槐、小叶女贞、圆柏、海桐和石楠叶片硫、铅和铜的含量相对较低,归为第3类。运用隶属函数法对不同类型绿化树种叶片硫、铅、铜含量进行综合分析,结果表明常绿乔木叶片综合污染物含量最高,针叶树种次之,其次是落叶乔木,常绿灌木最低。
In this paper, 12 kinds of green trees in Xinxiang City, including Platycladus orientalis, Sophora japonica, Ash, Magnolia grandiflora, Ligustrum lucidum, Heather, Euonymus japonicus, Prunus trilobata, Pittosporum, cedar, The contents of sulfur, lead and copper in greening trees were analyzed to study the differences of enrichment of air pollutants by greening trees. The results showed that the contents of sulfur, lead and copper in leaves of all the tested tree species increased with the spring and autumn seasons, and the contents of sulfur, lead and copper increased with the exception of the slight decrease in sulfur content in leaves of Magnolia officinale and Ligustrum lucidum compared with spring. Ranging from 18% to 216%, from 4% to 385% and from 27% to 334% respectively. Compared with the clean area, the content of sulfur, lead and copper in all the greening trees tested in the contaminated area was higher than that in the clean area High, the range of variation is 9% ~ 223%, 37% ~ 390% and 85% ~ 374% respectively. According to the comprehensive analysis of the contents of the pollutants in the green tree leaves, they were divided into three categories. The first category was represented by Cedrus decumbens and Magnolia grandiflora. The leaves contained high levels of pollutants such as sulfur, lead and copper. The second category included white wax, Zhen, Platycladus orientalis and Euonymus japonicus, the content of the three pollutants in the leaf was middle; the content of sulfur, lead and copper in the leaves of Cypress, Sophora japonica, Prunus trilobata, Sabina vulgaris, Pittosporium sibirica and Heather were relatively low, class. The membership functions were used to analyze the contents of sulfur, lead and copper in leaves of different types of tree species. The results showed that the content of the integrated pollutants in leaves of evergreen trees was the highest, the coniferous species was the second, followed by the deciduous trees and the evergreen shrubs.