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The Effects of Neyraudia Reynaudiana Vegetation on Heavy Metal Enrichment Characteristics and Biological Effectiveness on Coal Gangue Dumps
Pages: 329-335
Year: Issue:  3
Journal: Geology-Geochemistry

Keyword:  neyraudia reynaudianacoal gangueheavy metalenrichment characteristicbiological effectiveness;
Abstract: An abandoned mine coal yard located in the Maiping township of Huaxi district,Guiyang City was selected as the study area,and Neyraudia reynaudiana vegetation settled on coal gangue dumps after long-term natural restore was selected as the research object to study the effect of the vegetation on the characteristics of metal( Fe,Mn,Cu and Zn) enrichment and spatial distribution and biological effectiveness of coal gangue. Results show that the characteristics of metal for the coal gangue dumps are mainly distributed in root and surface layer on the space under the vegetation participate in the process. And it’s aerial part of enrichment coefficient( for Mn,Fe,Cu,and Zn) is greater( the ratio for Mn>1) or less than( the ratio for Fe,Cu and Zn< 1) the underground part,respectively.The test results of metals for all parts of the plant show that these metals were absorbed and stored in the stem leaf part( Mn) and root( Fe,Cu and Zn) by the vegetation,respectively. The transfer coefficient is higher( for Mn,3. 62) and lower( for Fe,0. 32; Cu,0. 60; and Zn,0. 93) than 1,respectively. The correlation coefficient among the amounts of heavy metals in the plant,effective state content and total amount of metal are significant or extremely significant positive correlated. The exist of vegetation can obviously reduce biological effectiveness of coal gangue characteristics of metal( except for the biological effectiveness of root layer of Mn is higher than control). Given that the root of Neyraudia reynaudiana has greater transport capacity and concentration for Mn and zinc,so we can choose the vegetation as pioneer or advantage plants for ecological control and restoration to coal gangue dumps pollutants release in situ.
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