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Relationship between heavy metal concentrations
of herbaceous plants and soils at four Pb-Zn mining sites in Yunnan,
China |
Yuan LI 1, Yanqun ZU 1, Qixian FANG 1, Zhaohua GAO 1, Christian SCHVARTZ 2, |
1.College of Resources
and Environment, Yunnan Agricultural University, Kunming 650201, China; 2.Institute of Agriculture,
Lille Catholic University, Lille 59046, France; |
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Abstract This paper studied the relationship between heavy metal concentrations of herbaceous plants and soils at four Pb-Zn mining sites in Yunnan, China. 50 herbaceous plant samples of 9 plant species from 4 families and 50 soil samples were collected and then ana1yzed for the tota1 concentrations of Pb, Cd, and Zn. The results showed that the average concentrations of Pb, Cd, and Zn in soil samples were 3772.83, 168.81, and 5385.65 mg/kg, respectively. The average concentrations of Pb, Cd, and Zn were 395.68, 28.14, and 1664.20 mg/kg in the shoots, and 924.12, 57.25 , and 1778.75 mg/kg in the roots, respectively. Heterospecific plants at the same site and conspecific plants at various sites had different average levels of Pb, Cd, and Zn, both in the shoots and the roots. Enrichment coefficients of Pb, Cd, and Zn were greater than 1 in 2, 3, and 9 herbaceous plant samples, respectively. Translocation factors of Pb, Cd, and Zn were greater than 1 in 10, 17, and 25 herbaceous plant samples, respectively. In all 50 samples, the concentrations of Pb, Cd, and Zn between the shoots and the roots, the shoots, and the soils, and the roots and the soils had significant positive relationships.
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Keywords
Pb
Cd
Zn
herbaceous plants
Pb-Zn mining areas
enrichment coefficient
translocation factor
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Issue Date: 05 September 2009
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