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| Effects of two pioneer plants on habitat improvement and heavy metal migration of lead-zinc smelting slags |
| Received:June 07, 2018 |
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| KeyWord:pioneer plants;lead-zinc smelting slags;nutrients;enzyme activities;heavy metals |
| Author Name | Affiliation | E-mail | | QIU Jing | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | WU Yong-gui | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
Institute of applied ecology, Guizhou University, Guiyang 550025, China
Karst Eco-Environmental Engineering Research Center of Guizhou Province, Guiyang 550025, China | ygwu72@126.com | | LUO You-fa | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | CHEN Ran | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | ZHENG Zhi-lin | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | | | ZHOU Jia-jia | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China | |
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| Abstract: |
| To determine the effects of pioneer plants on the ecological restoration of lead-zinc smelting slags in northwest Guizhou,this study analyzed the improvements effected by the naturally colonized plants Chenopodium ambrosioides L. and Neyraudia reynaudiana (Kunth) Keng ex Hitchc. on the nutrient and enzyme activity of the slag matrix.The effects of the two pioneer plants on the absorption and accumulation of toxic heavy metals (Cu, Cd, Zn, and Pb) and their chemical fractions in the rhizosphere were also examined, via field sampling and laboratory testing.The results showed that,when compared to exposed slag without vegetation restoration, the plants significantly (P<0.05) increased the nutrients (N, P, K, and organic matter) in the slag matrix, stimulated enzyme (alkaline phosphatase, urease, invertase, catalase) activity, and improved the microbial respiratory intensity of the rhizosphere of the slags. The growth of the pioneer species also altered the distribution of the chemical fractions of major heavy metals and promoted a change from the residual fraction into the exchangeable fraction, which increased the bioavailability of heavy metals in the rhizosphere. The translocation factors of Chenopodium ambrosioides L. on Cu, Cd, Zn, Pb and Neyraudia reynaudiana (Kunth) Keng ex Hitchc. on Cu, Zn, Pb were lower than 1, but the translocation factor of Neyraudia reynaudiana (Kunth) Keng ex Hitchc. on Cd reached 2.02, indicating its strong ability to absorb and transfer Cd. These two pioneer plants can grow in an extremely harsh slag environment, exhibit strong ecological adaptability, and have certain restorative effects on lead-zinc smelting slags. Both can be used as dominant pioneers during the early stages of ecological reconstruction or restoration engineering of slags. |
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