Effects of Arbuscular Mycorrhizal Fungi on the Uptake of Copper and Zinc by Eucalyptus

The effects of eucalyptus inoculated with Glomus mosseae(G.m) on the uptake of Cu and Zn and the interaction between Cu and Zn were investigated in pot experiments.Eucalyptus was cultured in artificial soil contaminated with increasing Cu(0,10,25,50 mg·kg-1) and/or Zn(0,50,100,200,300,500 mg·kg-1).Eucalyptus was harvested after inoculated for 8 weeks.The data about the biomass of eucalyptus,the colonization rate of root,Cu and Zn concentration in eucalyptus were determined.The results indicated that root colonization rates ranged from 20%~35%,and Cu or Zn concentration in soil had no significant effect on the colonization rates.The biomass of shoot increased 1~3 times after inoculating G.m.The concentrations of Cu and Zn in shoot decreased significantly by about 5%~40% and 50%~80%,respectively after inoculating G.m(P0.05).Without G.m,the concentration of Cu in shoot decreased with the increase of Zn in soil significantly(P0.05).However,increasing Cu in soil had few effect on the concentration of Zn in shoot.With inoculating G.m,the concentration of Cu in shoot decreased with the increase of Zn in soil significantly(P0.05),and the concentration of Zn in shoot decreased by increasing Cu in soil significantly(P0.05).