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| Heavy Metal Contents and Accumulation Characteristic of Seven Wild Plants from the Slagheap Surrounding of Huize Lead-zinc Tailings |
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| KeyWord:lead-zinc tailings; heavy metal; hyperaccumulator; bioconcentration coefficient; transfer coefficient |
| Author Name | Affiliation | | QIN Li | College of Resource and Environment, Yunnan Agricultural University | | ZU Yan-qun | College of Resource and Environment, Yunnan Agricultural University | | LI Yuan | College of Resource and Environment, Yunnan Agricultural University | | WANG Ji-xiu | College of Resource and Environment, Yunnan Agricultural University | | LI Bo | College of Resource and Environment, Yunnan Agricultural University | | LI Jian-guo | College of Resource and Environment, Yunnan Agricultural University | | JIN Xian-cun | College of Resource and Environment, Yunnan Agricultural University |
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| Abstract: |
| A field survey on wild plants growing in the slagheap surrounding of Huize lead-zinc tailings was carried out. The samples of plants and soils were collected. The contents of Cd, Pb and Zn in plants and soil were measured. The heavy metal accumulation characteristics of seven wild plants were studied. The results showed that the soil from the slagheap surrounding of lead-zinc mining tailings was contaminated by cadmium. The average content of Cd was 101 mg·kg-1, which was 462 times of the background level of soil in Yunnan Province. The average contents of Zn and Pb were 9065 mg·kg-1 and 3244 mg·kg-1, which were 101 times and 80 times of the background levels of soil in Yunnan Province. It was found that the seven wild plants had different abilities of uptake and accumulation of Pb, Zn, Cd. The contents of Cd in Chenopodium ambrosioides L., Achnatherum splendens Trin. Nevski and Cyperus microiria Steud were more than 100 mg·kg-1, which were 105~112 times higher than that in normal plants（1 mg·kg-1）. The transfer coefficient of Cd in C. ambrosioides was 2.5, indicating high transportation capacity of Cd. The bioconcentration coefficient of Cd in A.splendens and C. microiria were higher than 1, indicating high bioconcentration capacity of Cd. It suggests that the Cd absorption characteristics of these three plants need further researches. The contents of Pb in A.splendens and C. microiria were 2045 mg·kg-1 and 1623 mg·kg-1, which exceeded the threshold value（1000 mg·kg-1） as a Pb hyperaccumulator. The Zn transfer coefficient of Malva verticillata L. was up to 4.1, showing a strong transfer ability to Zn. The transfer coefficient of Cynodon dactylon L. Pers. to Pb, Zn and Cd were more than 1. In general, the results indicate that the five wild plants had strong bioconcentration capacity to heavy metal and could be useful as hyperaccumulator for phytoremediation of soil polluted by Pb, Zn and Cd. |
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