Effect of wild peach and Chinese pine on absorption and remediation of heavy metals in contaminated soil of coal District in Yulin of China

초록

Preliminary examination revealed the adsorbing effect of wild peach (Pyrus ussurensis) and Chinese pine (Pinus tabulaeformis) on cadmium (Cd). However, whether these two woody plants can be applied in the remediation of fields contaminated with heavy metals needs to be investigated. Coal mining activities are important anthropogenic sources of heavy metals to the local environment. To explore the modification effect of peach and pine on heavy metals in contaminated soil of coal mine, the Mahuangliang Coal Mine area in Yulin City of China was selected for field experiments. Heavy metal concentrations in roots and leaves of wild peach, Chinese pine, and soil samples were measured by using inductively coupled plasma mass spectrometry. Results indicate that Cd pollution is the most serious contaminant, followed by Cu pollution. Moreover, high risks of Pb, Cr, and As contamination were observed. The heavy metal bioconcentration factors of wild peach leaves and roots vary between 0.1 and 0.4 for all of detected heavy metals, and the values in roots are higher than those in leaves. However, the bioconcentration factor of Hg in pine leaves is 1.61, which is 7 times higher than the value in roots, and the concentration of Hg in leaves is 6.95 times higher than that in roots. Results suggest that wild peach and Chinese pine are potential materials for the restoration of heavy metals in contaminated soils, but different tissues of different plant species function differently. The enrichment capacities of wild peach and Chinese pine for Cd, As, Pb, Cr, Cu, and Zn are higher than those of leaves, while leaves are mainly applicable for the absorption of Hg from the atmosphere. © 2019 Eastern Macedonia and Thrace Institute of Technology.

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