2Wong S C,Li X D,Zhang Get al. Heavy metals in agricultural soil of the Pearl River Delta, South China[J].Environmental Pollution, 2002,119: 33-44.
3Zhang G P,Fukami M,Sekimoto H.Influence of cadmium on mineral concentrations and yield components in wheat genotypes difering in Cd tolerance at seedling stage Field Crops Research, 2002,77 : 93-98.
5DEMIREVSKA-KEPOVA K,SIMOVA-STOILOVA L, STOYANOVA Z,et al.Biochemical Changes in Barley Plants after Excessive Supply of Copper and Manganese [J].Environmental and Experimental Botany, 2004,52:253-266.