In-situ phytoextraction of Ni by native populations of Alyssum murale on an ultramafic site(Albania)

摘要

Ultramafic outcrops located in eastern Albania hosts by native populations of Ni hyperaccumulator Alyssum murale. A field ex periment in situ was conducted in Pojske 2005-2006, that consisted in testing the phytoextraction potential of natural vegetation with or without suitable fertilisation and selective herbicide. In the stone time a greenhouse experiment consited in studying A. murale behaviour to different fertilisation regimes without other competitor species. The soil (Magnesic Vertic Cambisol) had mainly two Ni-bearing phases: high-Mg smectite (1.3% mean Ni content) and serpentine (0.7% Ni), the first one being a highly available source of Ni for plants. Accordingly, Ni availability was extremely high. Fertilisation and herbicide treatment in creased dramatically the biomass of A. murale. Phytoextracted Ni in A murale harvested reached 29.5 kg(Ni)·ha<'-1> on the fertilised plots. It was significantly lower in urfertilised plots (1.8kg (Ni)·ha<'-1>). Phytomining could be promising on such sites by fertilising already installed natural populations with limited effect of plant species control.