APPLICATION OF REED (Phragmites australis) IN TREATING HEAVY METAL CONTAMINATED SOIL IN TU LE LEAD-ZINC MINE, TU LE COMMUNE, LAO CAI PROVINCE, VIETNAM
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DOI:
https://doi.org/10.34238/tnu-jst.13010Abstract
This study assessed the effectiveness of reed (Phragmites australis) in treatment of soil contaminated with heavy metals at the Tu Le lead-zinc mine waste dump, Tu Le commune, Lao Cai province. The field experiment was carried out for eight months with randomized block design to monitor the growth, heavy metals accumulation and effectiveness of the reed treatment against pollution. The results showed that reed had the ability to grow stably on heavily contaminated soil at 145.33 cm in height and at 57.43 cm in root length. Analysis of plant samples showed that the plant accumulated heavy metals predominantly in the roots, particularly in the case of Pb, Cd and As. After 8 months, the heavy metal treatment efficiency in the soil reached high levels: Zn (66.5%), Pb (73.95%), Cd (66.71%) and As (73.43%). In addition, there is a positive correlation between the concentration of heavy metals in the soil and the accumulation in the plant (R² reaches 0.81 - 0.95 in the roots and R² reaches 0.55 - 0.76 in the stems and leaves). The results show that reed is a potential plant species in the treatment of heavy metals contaminated soil in mining areas, which can be applied in sustainable soil improvement and environmental restoration programs in the mountainous areas of Northern Vietnam.Downloads
References
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