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| Accumulation Characteristics of Heavy Metals in Weed Plants from a Catchment of Lower Minjiang River |
| Received:May 26, 2015 |
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| KeyWord:catchment;weed;heavy metal;enrichment characteristics |
| Author Name | Affiliation | E-mail | | JIAN Yi | Institute of Ecological & Forestry, Sichuan Agricultural University, Wenjiang 611130, China | | | ZHANG Jian | Institute of Ecological & Forestry, Sichuan Agricultural University, Wenjiang 611130, China | sicauzhangjian@163.com | | YANG Wan-qin | Institute of Ecological & Forestry, Sichuan Agricultural University, Wenjiang 611130, China | | | LIN Jing | Institute of Ecological & Forestry, Sichuan Agricultural University, Wenjiang 611130, China | |
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| Abstract: |
| Phytoremediation of soil heavy metals has drawn much attention. In this study, we investigated content and distribution of 5 heavy metals(As, Cd, Cu, Pb and Zn) in different parts of 11 weed plants collected from a typical catchment of Minjiang River in Wutongqiao District of Sichuan Province.(1)Soil pH and organic matter were 5.57 and 12.94 μg·g-1, respectively.(2)The soils were polluted heavily by Cd, but less by the others.(3)The content of heavy metals in weed plants was Zn> Pb> Cu> As> Cd, with As mainly accumulated in the roots.(4)The plants with two or more heavy metals higher in above-ground than in below-ground were Lophatherum gracile, Rumex patientia, Emilia sonchifolia, Lygodium yunnanense, Dicranopteris dichotoma, Ophiopogon Japonicus, Clematis montana, Oxalis corniculata and Pteris vittata.(5)All weed plants showed a weaker capacity to accumulate As, as indicated by As bio-accumulation and transfer index of lower than 1. Both bio-accumulation and transfer index were more than 1 for Cd, Cu, Pb, Zn in D. dichotoma and P. vittata, Cd, Pb and Zn in L. gracile, E. sonchifolia, L. yunnanense and O. corniculata, Cd and Cu in O. Japonicus, and Cd and Zn in C. montana. The results indicate that these weeds have the potential to rehabilitate heavy metal-polluted soils. |
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