12种道路绿化树木叶片重金属含量比较

Comparisons of heavy metal contents in leaves of 12 roadside greening afforestation tree species

对新乡市12种道路绿化树木叶片重金属铅、镉和锌的含量进行分析。结果表明,同种道路绿化树木叶片的重金属含量表现为污染区>清洁区,不同树种道路绿化树木叶片的重金属含量具有明显差异,铅含量的大小排序为榆树>栾树>雪松>刺槐>悬铃木>夹竹桃>毛白杨>柳树>卫矛>圆柏>臭椿>核桃;镉含量的大小排序为毛白杨>雪松>栾树>悬铃木>夹竹桃>臭椿>柳树>榆树>悬刺槐>圆柏>卫矛>核桃,锌含量的大小排序为夹竹桃>榆树>臭椿>柳树>刺槐>栾树>雪松>毛白杨>核桃>圆柏>卫矛>悬铃木。运用隶属函数法对12种道路绿化树木叶片重金属含量进行归类,榆树和栾树归为第1类,夹竹桃、雪松、毛白杨、刺槐、柳树、悬铃木和臭椿为第2类,卫矛、圆柏和核桃归为第3类。

The heavy metals （Pb, Cd and Zn） contents in leaves of 12 roadside greening trees in Xinxiang city of Henan province were investigated and analyzed. The results indicate that the same roadside afforestation tree species showed different heavy metal contents in their leaves, the leaf heavy metal content in the polluted area was bigger than that in the clear area, simultaneously the leaf heavy metal contents of different tree species in same area showed significant differences, the content of Pb was in the order of Ulmus pumila 〉 Koelreuteria paniculata 〉 Cedrus deodara 〉 Robinia pseudoacacia ~ Platanus hispanica 〉 Nerium indicum 〉 Populus tomentosa 〉 Salix babylonica 〉 Euonymus alatus 〉 Sabina chinensis 〉 Ailanthus altissima 〉 Juglans regia; the content of Cd was in the order of Populus tomentosa 〉 Cedrus deodara 〉 Koelreuteria paniculata 〉 Platanus hispanica 〉 Ailanthus altissima 〉 Salix babylonica 〉 Ulmus purnila 〉 Robinia pseudoacacia 〉 Sabina chinensis 〉 Euonymus alatus 〉 Juglans regia; the content of Zn was in the order of Nerium indicum 〉 Ulmus pumila 〉 Ailanthus altissima 〉 Salix babylonica 〉 Robinia pseudoacacia 〉 Koelreuteria paniculata 〉 Cedrus deodara 〉 Populus tomentosa 〉 Juglans regia 〉 Sabina chinensis 〉 Euonymus alatus 〉 Platanus hispanica; the afforest trees were classified three at the basis of the content of Pb, Cd and Zn, the first category included Ulmus pumila and Koelreuteria panieulata; Nerium indieum, Cedrus deodara, Populus tomentosa, Robinia pseudoacacia, Salix babylonica, Platanus hispanica and Ailanthus altissima belong to the second category; the third category included Euonymus alatus, Sabina chinensis and Juglans regia.