STUDY ON PHYTOEXTRACTION BALANCE OF ZN, CD, PB FROM MINE-WASTE POLLUTED SOILS BY USING MEDICAGO SATIVA AND TRIFOLIUM PRATENSE SPECIES
Keywords:
pollution, Zn, Pb, phytoextraction, alfalfa, red cloverAbstract
For a term of two years was studied phytoextractive potential of Zn, Cd and Pb
using successive culture of alfalfa (Medicago sativa) and red clover (Trifolium
pratense). In the experimental plot was incorporated a quantity of 20 kg mine waste
per square meter, providing in soil 1209 mg Zn/kg d.s., 4.70 mg Cd/kg d.s. and 188.2
mg Pb/kg d.s. The metals content accumulated in plants was determined at the two
moments of biomass harvesting, and through balance calculations we could
establish the phytoextraction efficiency of the two forage-grasses species. The
obtained results indicate that both perennial forage-legumes species have a good
phytoextractive capacity and tolerance for Zn and Pb, especially Trifolium pratense
specie. By using this species as phytoextractors on soil polluted with 3.76 times more
Pb and 4.03 times more Zn, is provided the reduction of metallic ion.
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