Guan Dong-Sheng, Peart M R
Department of Environmental Science, Sun Yatsen University, Guangzhou 510275, China.
J Environ Sci (China). 2006;18(3):495-502.
Levels of Cu, Ni, Zn, Pb and Cr were measured in soils and trees in urban Guangzhou, China. Tree and soil samples were collected from the roadside, urban parks and a university campus. Mean concentrations of Cu, Ni, Zn, Pb and Cr in tree leaves were 28.3, 7.7, 142.1, 23.4, and 195.1 mg/kg respectively. In a comparison of heavy metal concentrations in tree leaves between roads and park locations, only Pb concentrations were significantly higher in the former. Heavy metal concentrations were lower in the roots compared to leaves. It indicated that heavy metal pollution of trees is mainly from air pollution. For all top soil samples the mean concentrations of Cu, Ni, Zn, Pb and Cr were 24.3, 17.3, 121.5, 63.9 and 88.7 mg/kg, respectively. Heavy metal concentrations in roadside soils were higher and their coefficient of variation was higher than those in urban parks. Comparing heavy metal concentrations in trees and soil between urban Guangzhou and Hainan Island, China, Cu, Ni, Zn, Pb and Cr levels in soils and plants in urban Guangzhou were evidently affected by the human impact. However the heavy metal content in the soil compared to some international standards do not give cause for concern. Some observations on the implications of the data for environmental monitoring are made.
对中国广州城区土壤和树木中的铜、镍、锌、铅和铬含量进行了测定。树木和土壤样本采集自路边、城市公园和大学校园。树叶中铜、镍、锌、铅和铬的平均含量分别为28.3、7.7、142.1、23.4和195.1毫克/千克。在比较道路和公园区域树叶中的重金属含量时，只有前者的铅含量显著更高。树根中的重金属含量低于树叶。这表明树木的重金属污染主要来自空气污染。所有表层土壤样本中，铜、镍、锌、铅和铬的平均含量分别为24.3、17.3、121.5、63.9和88.7毫克/千克。路边土壤中的重金属含量更高，其变异系数也高于城市公园。比较广州城区与中国海南岛树木和土壤中的重金属含量，广州城区土壤和植物中的铜、镍、锌、铅和铬含量明显受到人类活动的影响。不过，与一些国际标准相比，土壤中的重金属含量并无令人担忧之处。文中对这些数据在环境监测方面的意义进行了一些观察。
