STUDY GROWTH AND HEAVY METAL ABSORTION CAPACITY OF REED PLANT (PHRAGMITES AUSTRALIS) IN SOIL AFTER MINING IN LAO CAI PROVINCE

Abstract

Using plant species absorb heavy metal in post-mining soils called bio-remidiation method that have applied at many countries in the world because of their high feasibility, financial savings and renewable environment. The result of study on application of reed plant (Phragmites australis) in rehabilitation of contaminated soils after mining of  Lao Cai province showed that the reed plants grow normally on waste land after mining, the growth of the plant also depends on the environmental characteristics, pH of the soil. The heavy metal content accumulated in the trunks, leaves and roots is much higher than the initial heavy metals content in the reed plants when planting back. The result also show that the heavy metal content accumulated in the roots is higher than the heavy metal content accumulated in the trunks and leaves. The highest absorption rate was achieved for Zn, Cd, Pb and finally for As.