Restoration potential of pioneer plants growing on lead-zinc mine tailings inLanping, southwest China
LEI Dongm , DUAN Changqun
DOI:
Received December 25, 2007,Revised April 01, 2008, Accepted , Available online
Volume 20,2008,Pages 1202-1209
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This study focused on the restoration potential of ten pioneer plants (Artemisia roxburghiana, Artemisia tangutica, Carex inanis,
Cyperaceae hebecarpus, Plantago depresa, Cynoglossum lanceolatum, Potentilla saundesiana, Coriaria sinica, Oxyria sinensis, and
Miscanthus nepalensis) during the early phase of Pb-Zn mine tailings phytostabilization, in Lanping, China. The concentrations of
heavy metals (Pb, Zn, and Cu) and soil fertility (the available N, P, K, and organic matter) in the rhizosphere of these species have
been compared. The results showed a general improvement in the rhizosphere soil properties of pioneer plants. Of the ten species, the
concentrations of Pb, Zn, and Cu in the rhizosphere of A. roxburghiana have the greatest reduction of 56.23%, 83.00%, and 84.36%,
respectively, compared to the bulk soil. The best improvement in soil fertility was found in the rhizosphere of P. saundesiana, with an
increase of 241.83%, 170.76%, 49.09%, and 81.60%, respectively, in the available N, P, K, and organic matter. Metals accumulated by
the plants have been mainly distributed in the root tissues, and only small amounts transferred to the aboveground tissues. The highest
contents of Pb and Zn have been recorded in C. hebecarpus with 57.84 and 87.92 mg/kg dry weight (dw), respectively. The maximum
Cu content was observed in C. inanis with 1.19 mg/kg dw. Overall, pioneer plants will be ideal species for the phytostabilization of mine
tailings, but the potential use varies in di erent pioneer plant species. Among these ten species, A. roxburghiana has been identified to
be the most suitable for phytostabilization programs, due to its greatest improvement on physical-chemical properties in the rhizosphere
soil.
