journal6 ›› 2015, Vol. 36 ›› Issue (6): 79-83.DOI: 10.3969/j.cnki.jdxb.2015.06.018

• Characteristic column.Study on Wuling Mountain Area • Previous Articles     Next Articles

Heavy Metal Pollution Assessment and Vegetation Restoration Simulation at Mined Waste Rock Yards

 PENG  Xi-Zhu, LI  Feng-Mei, YANG  Sheng-Xiang   

  1. (College of Biological Resources and Environmental Science,Hunan Provinical Engineering Laboratory of Control and Remediation of Heavy Metal Pollution from Mn-Zn Ming,Jishou University,Jishou 416000,Hunan China)
  • Online:2015-11-25 Published:2015-12-23

Abstract: An assessment of heavy metal pollution was conducted at 7 mined waste-rock yards in Xiangxi Autonomous Prefecture.The results obtained from the contamination index method showed high level of heavy metals,among which the levels of Zn,Pb and Cd exceeded the Grade III according to China Environmental Quality Standard for Soils (GB 15618—1995).The contamination index showed clean-mild-moderate contamination by Pb,clean-mile contamination by Zn and clean-moderate contamination by Cd.The general index indicated clean-mild-moderate contamination. The vegetation restoration simulation results showed that three plants (Lolium perenne,Medicago sativa and Chrysanthemum indicum) could germinate and grow in all the cover depths,and the germination rate,plant height and biomass of the three plants significantly increased with the cover depths.Overall,the plants in the treatment of 50 mm grew healthily with the highest germination rate,plant height and biomass.

Key words: mined waste-rock yard;heavy metal contamination, spray-seeding technology;vegetation restoration

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