6SALT D E,BLAYLOCK M,KUMAR N P B A,et al.Phy-toremediation:A novel strategy for the removal of toxic met-als from the environment using plants[J].Nature Biotechnol-ogy,1995,13(5):468-474.
7REID R,HAYES J.Mechanisms and control of nutrient up-take in plants[J].Int Rev Cytol,2003,229:73-114.
8GUNKEL P,JEZEQUEL K,FABRE B.Temporal evolutionof copper distribution in soil fractions,influence of soil pHand organic carbon level on copper distribution[J].Environ-mental Technology,2002,23(9):1001-1008.
9HOLM T R.Copper complexation by natural organic matter incontaminated and uncontaminated ground water[J].ChemicalSpeciation and Bioavailability,1990,2(2):63-76.
