STUDIES REGARDING THE ESTABLISHMENT OF PERENNIAL PLANT COMMUNITIES STIMULATED WITH BIOSOLIDS ON FLY ASH DUMPS

摘要

This is a study regarding the storage of waste in a dump which seriously deteriorates the soil properties, both in the storage area and the surroundings. Application of fertilising materials (biosolids) on barren ground is often used for the introduction of organic matter and nutrients for plant growth on such soils. Two forage plant species were used: tall fescue (Festuca arundinacea) and sainfoin (Onobrychis viciifolia). F arundinacea presented a higher degree of growth and density in comparison with O. viciifolia. The bioaccumulation degree of heavy metals (Fe, Cu, Cr, Ni, Zn and Pb) in the aerial tissue of plants was analysed. The addition of biosolids fertiliser caused a significant reduction of metal accumulation in tissues for both species. It may be concluded that the pollution caused by fly ash had a bad influence on the growth and development of O. viciifolia plants, even lethal. Plants of O. viciifolia gradually disappeared in the dry months of summer.