STUDY ON PHYTO-EXTRACTION BALANCE OF ZN, CD AND PB FROM MINE-WASTE POLLUTED SOILS BY USING FESTUCA ARUNDINACEA AND LOLIUM PERENNE SPECIES
Keywords:
tall fescue, perennial ryegrass, phyto-extraction, zinc (Zn), cadmium (Cd), lead (Pb)Abstract
Through the cultivation of tall fescue (Festuca arundinacea) and of perennial
ryegrass for two years on a chernozem type of soil, in the Banat's plain area we
investigated the phyto-extraction potential of Zn, Cd and Pb. In the experimental
plot it has been incorporated a quantity of 20 kg of mine-waste per square meter, in
a mass ratio of 1:2,5. The mine-waste polluting "contribution" was of 1209 mg Zn /
kg d.s., 4.70 mg Cd / kg d.s. and 188.2 mg Pb / kg d.s. The metals content in the soil
was determined at the two moments of biomass harvesting, and through balance
calculations we could establish the phyto-extraction efficiency of the two foragegrasses species. The obtained results indicate that Festuca arundinacea has an
average phyto-extraction yield of 50% for Zn and Cd in the soil; in the case of an
ionic excess of 3,5 to 4 times, the phyto-extraction efficiency is reduced, more
obvious in the case of Pb (lead) ions. The species Lolium perenne registers a yield of
almost 92% in the process of phyto-extraction of Zn. The yield values for Cd si Pb
are lower, but comparable with the control plot. Unlike Festuca arundinacea, the
Lollium perenne species tolerates better the Cd and Pb ionic excess.
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